114 
Fig-. 10. Same part from Cuma arenosa. 
„ 11. Same part from Lamprops fasciata 
(dorsal view). 
„ 12. Same part from Psciulocumci cercaria 
(ventral view). 
13. Same part from Campy! aspis rubicunda 
(ventral view). 
PI. LXVII. 
Internal Anatomy of Cumacea (continued). 
Fig. 1. Anterior part of body together with 
the first 3 caudal segments of a young 
female specimen of Lcucon Nasica, 
viewed from left side. Internal organs 
delineated within the body in their 
natural position. Lettering as in fig. 
1 on the two preceding plates. 
„ 2. Left ovarial sac of the same indi¬ 
vidual, isolated and more highly 
magnified. 
„ 3. One of the ova contained in the sac 
isolated. 
„ 4. Ovarial sacs of a very young specimen 
of Diastylis lucifera , showing the small 
median connecting part. 
„ 5. Egg-cell from same, highly magnified. 
„ 6. Epithelial cell. 
„ 7. Anterior part of intestine with the 
liver-sacs from Lexicon JS'asiea; ventral 
view. 
„ 8. Same part from a male specimen of 
Lexicon fulviis. 
„ 9. Heart with pericardium from a male 
Diastyloides biplicata, as found by 
dissection of an alcoholic specimen; 
left side-view. 
PI. LXV1II. 
Internal Anatomy of Cumacea (continued). 
Fig. 1. Anterior part of body together with 
the first 3 caudal segments of an 
adult male specimen of Lcucon Nasica , 
viewed from left side. — t. testes; 
remaining letters as in fig. 1 on the 
3 preceding plates. 
„ 2. Testes of same species isolted, together 
with last pedigerous segment; ventral 
view. 
„ 3. Anterior part of one of the testes 
more highly magnified, exhibiting the 
ccecal lateral lobes. From the lower 
ruptured end, the zoosperms are seen 
protruding. 
„ 4. A bundle of zoosperms still enveloped 
by a thin membranous sheath. 
„ 5. Another bundle, in which the envelope 
has been cast off. 
(i. A fully-developed zoosperm isolated. 
7, 8. Front part of 2 other zoosperms 
from same species, highly magnified. 
Fig. 9, 10, 11. Zoosperms from Lcucon fxdxms. 
„ 12. One of the testes from an adult male 
of Diastylis lucifera. 
„ 13. Anterior part of same, more highly 
magnified. 
„ 14, 15, lfi. Zoosperms from the same 
species. 
„ 17 — 20. Not yet fully developed zoosperms 
from a young male of Diastylis luci - 
fera. 
„ 21. Germinal cells of same specimen. 
„ 22. Zoosperm from Hemilamprops rosea. 
PI. LXIX. 
Development of Cumacea. Diastylis lucifera. 
Fig. 1. Ovum still enveloped by a thin filmy 
membrane, and exhibiting the coarsely 
granular central yolk-mass and the 
peripheric layer of clear cleavage-cells. 
The latter has considerably 7 increased 
on one side, to form the ventral face 
of the developing embryo. 
„ 2, 3. Another ovum in a somewhat later 
stage, represented in 2 different po¬ 
sitions, to show the cruciate arrange¬ 
ment of the central yolk-mass. 
„ 4. Early stage of the embryo, exhibiting 
the first intimations of the limbs,' and 
still enveloped by the chorion; left 
side-view. — a 1 , superior antennae; 
or. inferior a..tenure: M. mandibles; 
L. anterior lip; m}. anterior maxillae; 
m 2 . posterior maxillae; mp 1 . 1st pair 
of maxillipeds;. mp 2 . 2nd pair of 
maxillipeds; mp s . 3rd pair of max¬ 
illipeds; p l .-—p*. legs of 1st to 4th 
pair; f. dorsal cleft. 
„ 5. Embryo in a later stage, viewed from 
left side. The chorion has been cast 
off, whereby’ the 3 anterior pairs of 
limbs have been set free, the others 
being still enclosed in the larval skin. — 
C. inferior edge of the developing cara¬ 
pace; urp. uropoda; /. capsule imbed¬ 
ded in the yolk-mass and forming the 
first indication of the liver; remaining 
letters as in fig. 4. 
„ (5. A still more developed embryo, in 
which the larval skin has been cast 
off, thus causing all the limbs to 
be freely exposed; lateral view. — 
O. developing eyes ; It. rostral plates 
of carapace ; hr. exp. exopodal part 
of the branchial apparatus; t. telson; 
remaining letters as in fig. 5. 
, 7. Same embryo viewed from the dorsal 
face. 
„ 8. Embryo in the immediately succeeding 
stage, viewed from left side. The 
dorsal curvature of the body- has 
changed to a pronounced ventral one, 
