TUNICATA. 25 
PLATE III. 
Fics. 1, 2 and 3.—Three specimens of Corella ewmyota, Traustedt, from the upper surface; natural 
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Fig. 
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Fira. 
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size. 
4.—Dorsal tubercle and anterior end of dorsal lamina ; slightly enlarged. 
5.—Tentacles; x 40. 
6.—Dorsal region of anterior end of branchial sac, showing tentacles, dorsal tubercle. 
epipharyngeal groove, dorsal languets and branchial sac ; x 50. . 
7.—Molgula hodgsoni, from right side ; natural size. 
8.—Body after removal of test, right side ; natural size. 
I— ,, re 3 » » left-side; natural size. 
10.—Dorsal tubercle; x 50. 
11.—Part of branchial sac, from inside; x 50. 
12.—Alimentary canal and gonad of left side; slightly enlarged. 
13.—Alimentary canal and gonads of both sides, from the ventral surface ; slightly enlarged. 
PLATE IV. 
1.—Molyula bacca, right side ; natural size. 
Oso Tu » left side; natural size. 
3.—Part of branchial sac from inside; x 40. 
4,—Alimentary canal; x about 2. 
5.—Tentacles and dorsal tubercle, etc.; x 40. 
6.—Halocynthia discoveryt, tight side ; natural size. 
7.—The same, left side, from a photograph ; x 2. 
8.—Part of dorsal lamina, showing languets; x 40. 
9.—Another group of Janguets closer together ; x 40. 
10.—Part of branchial sac, from inside; x 40. 
11.—One of the compound tentacles. 
12.—The dorsal tubercle; x 40. 
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PLATE V. 
1.—Molgula concomitans, left side, with Molgula longicaulis, right side, adhering ; natural size. 
2.—-Part of surface of test of J. concomitans, showing the irregular hair-like prolongations, 
with a few sand grains; x 40. 
3.—Base of stalk of J. longicaulis, attached to right side of AZ. concomitans ; natural size. 
4.—M. concomitans, removed from test ; natural size. 
iy aes part of branchial sac, from inside ; x 40. 
(re dorsal tubercle; x 40. 
Ty oon one of the large much-branched tentacles ; x 40. 
8.—M. longicaulis, removed from test ; natural size. 
9.— ,, Pe part of mantle. 
10.—,, 3 part of branchial sac, from inside. 
l1l.—.,, 4 dorsal tubercle ; x 40. 
