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Polymastia penicillus Mont. (Vosmser).
Polymastia penicillus, Vosmser, Niederländ. Archiv ftirZoolog., Supplementb.
I, p. 26, Pl. 1, fig. 12—13, and Pl. 4, fig. 127—132.
Numerous specimens represent this species. All the
spe-cimens are furnished with well developed mammulse, which
often are inflated at the free terminations. This species is
very variable in outer shape, but the spicules are similar in
ali forms. I have labelled numerous species from the coast
of Sweden as Polymastia mamillaris O. F. Mtiller (Bow.),
be-c-ause they agree well with Bowerbank’s description of the
species, so named. But the specimens from the arctic regions
agree more with forms described and figured by Yosmser as
P. penicillus Mont. (Vosmsr), and therefore I have labelled
these as Polymastia penicillus Mont. (Yo s m se r), the only
diffe-rence between these two forms existing in their outer shape, their
spicules being of the same size and kind. The forms labelled
as Polymastia penicillus Mont. (A^osmser) are also generally
hirsute at the margins and on the upper surface; the other
forms are more smooth. The niammulse are exceedingly
variable in size and number.
The sponge is usually attached to stones, shells and other
hard objects.
The colour varies from yellow to yellowish grev or light
ash-grey. The largest specimen is 60 mm in length, 40 mm
in breadth, the thickness not exceeding 15 mm. The single
smooth specimen in the collection of arctic sponges has
numerous straight, slightly compressed mammulae, the length
being about 5 mm.
Habitat. The east-coast of Greenland, depth 130 fathoms
(580 S.); North-East from Petrovski Bay, Lat. 76° 52’, Long.
116° E., depth 36 fathoms (39 V.); Lat. 76° 40’, Long. 115° 30’E.,
depth 35 fathoms (40 V.); Matotschkin schar, Gubin Bay, depth
5—15 fathoms (42 N. S.); Spitzbergen, Lat. 80° 7’, Long. 16°54’ E.r
depth 60 fathoms (256 Sp.).
Polymastia paupera n. sp.
Plate 24, fig. 21.
During the expedition to Greenland in the year 1883
only one specimen was dredged up. This specimen, broken
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