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236
Fig.24*. Chydorus sphæricus [0. F. Miill.]. Apex cauda« maris;
a orificium vasis deferentis.
- 25. Chydorus glo bos us, Baird. Cauda feminæ.
- 26. Acroperus leucocephalus [Koch]. Cauda maris; a. ori-
ficium vasis deferentis.
- 27*. Acroperus angustatus, Sars. Cauda maris; a. orificium
vasis deferentis.
- 28*. Alonopsis elongata. Sars. Ornamentuni cuticulæ cras-
sioris in media cervice. [Conf. expl. fig. 2.]
- 20. Bythotrephes Ced erst ro m ii, Schodl. Apparent oculus,
complexus nervorum et gangliorum centralium, antennæ,
copæ amputatæ, os cum labro et mandibula et maxilla
rudimentari, ventriculus, oesophagus, testa ephippiformis
capitis pr. al a. Organum accessorium oris, quo I glandulam
salivalem esse existimo. b. »Organum adhæsionis■.
TAB. V.
1. Bythotrephes Cederstrøm ii, Schodl. »Matrix«
eni-bryonis feminei [ante pigmentuni oculi constructum]. a—a’.
Strata primordialia replicationis testæ, e qua »Matrix«
ex-oritur, hic manifesto apparent.
2. ld. »Matrix« pulli feminei e »matrice« materna nuper
dimissi. a — a’. Replicatio testæ, cujus strata superiora
jam iiunc concreta et limites coniin evanidi sunt; stratum
niodo inferius manifesto apparet.
3. ld. BMatrix*< feminæ adultæ, e qua nuper quatuor pulli
dimissi sunt, et quæ nunc utrobique ova æstiva pauca [l>]
continet. liujus formæ »Matrix« est, quum primum ova
accipit, et in hane formam seniper mutatur, quum pulli
liberati, et ova nova accipieuda sunt. a —a’. Replicatio
testæ; paries’ sacci inferior simplex superiori primordialiter
composito incumbit.
4. ld. »Matrix« feminæ adulta. liujus formæ »Matrix« est,
quum pullos magnos continet. Paries inferior forniceni
coniplanatuni, cariniformem in medio sacco. ne cor premat,
efticit et saccum in partes duas laterales dividit.
5. ld. »Matrix« feminæ adultæ ad ova hiberna accipieuda
accommodata, ovuni acceptura. Paries inferior sacci turgidus,
glandulas numerosas continens apparet. a. Oviductus. 1>.
Vagina. c. Vulvæ. Vaginas et Vulvas utriusque lateris
sæpitis vidi. sed in iis modo feminis, quæ ova hil^erna
habebant; nonne in his solis reperiuntur?
6. ld. »Matrix» feminæ adultæ, quæ nuper ovuni hibernuni
accepit. a. Oviductus in quo zoospermium contractuni et
elongatum insedit; in sacco zoospermium, partu ex ovario
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