IE, 
EXPLANATION ORTES. 
1.—Monobotryllus violaceus, tentacular circulet, dorsal tubercle, and part 
of peripharyngeal band, x 50. 
2% a Be marginal zone of test, showing knob-like 
terminations of blood vessels, x 50. 
3. N; m part of branchial sac, x 50. 
4.—Ascidia canaliculata, Heller (?), test. Nat. size. 
5. ,,  trregularis, n.sp., entire animal, from right side. Nat. size. 
6. se oA with test removed, seen from right side. Nat. 
size. 
7e I 5 seen from left side. Nat. size. 
8. r ne alimentary canal, X 2. 
9. 2 Mn tentacles, dorsal tubercle, and dorsal lamina, 
>20, 
Io. Le se part of branchial sac, x 40. 
aie A hyalina, n. sp., entire animal, from left side, x 3. 
12} N ae dorsal tubercle and dorsal lamina, x 40. 
