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of the process to the main spine is somewhat greater than the distance from the latter to the
proximal ventral spine. The dorsal bristle is attached somewhat nearer to the point of the
process than its distance from the main spine and about as far as its own length distally of the
latter; it extends to a distance of almost half its length distally of the point of the process. The
dorsal serrate teeth are rather large. The main spine is unusually powerfully developed. There
are flve or six ventral spines, in most cases rather strong, of whieh the two distal ones point
proximally; the distal one of these spines is sometimes even of the same size and type as the main
spine. On the part distally of the main spine there are only a few transverse rows of hairs, one
or two were observed. The rod-shaped process has four short and powerful distal spines.
Basale: The backward pointing process is of about the same type as in the preceding species
(fig. 9), but four or five triaena bristles were observed and the glandular papilla was somewhat
more powerfully developed. The dorsal side of this joint lias about ten to twelve rather short
bristles with short hairs (cleaning organs? they are often very dirty); these bristles are spread
along almost the whole of the joint and between them there are numerous short, strong, pointed
spines, arranged in groups; in addition there are dorsally on this joint groups of short, stiff hairs.
The exopodite (fig. 7) is, even if its two distal bristles are included, somewhat less than
half the length of the dorsal side of the first endopodite joint. Endopodite (figs. 7 and 11):
The shortest of the three ventral bristles on the first joint is only armed with short, fine
hairs; of the two others one has from about seven to nine pairs of short secondary bristles
proximally of the long ones, the other has either no such short bristles or only a few (one to
four were observed). This joint is armed antero-distally with four short, powerful, pointed
chitinous spines (from which the species derives its name); cf. fig. 10. Second joint:
This has four rather short proximal bristles, subequal or only difïering rather slightly in
length; the longest of these is only about from a quarter to a sixth of the length of the main
bristle a. Between the main bristles b and c there is a long, narrow bristle with short hairs.
The medial cleaning bristles on this joint are very numerous, but vary. Four specimens that
were investiga ted showed the folio wing conditions:
Type specimen: Right inaudible
7 bristles in a distinct lower row.
8 ,, ,, ,, ,, upper ,,
3 ,, ,, ,, ,, row inside the main bristle b.
1 bristle above bristle no. 1 of the latter row.
1 ,, between the main bristles a and b.
1 ,, close to the main bristle a.
Left
8 bristles in a distinct lower row.
7 „ „ „ „ upper „
1 bristle above bristles nos. 3 and 4 of the latter row.
1 „ „ „ » ü „ G ., ..
2 bristles inside the main bristle b.
I bristle between the main bristles a and b.
1 ,, close to the main bristle a.
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