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D. Saccus branchialis 8 plicis in ntroque latere ornatus: 
*) Superficies tunicæ multis parvis papillis approximatis coni- 
formibus ornata: 14. C. papillosa, (L.). 
**) Superficies tunicæ subrogosa, sine papillis: 
15. C. pallida, Heller. 
E. Saccus branchialis 9 plicis in ntroque latere ornatus: 
*) Superficies tunicæ inprimis circum aperturam oris et aper- 
turam cloacalem processibus criniformibus ramosis: 
16. C. hispidci, Herdman. 
**) Superficies tunicæ subrogosa, sine processibus: 
17. C. momus , Sav. 
F. Saccus branchialis 11 plicis in ntroque latere ornatus : 
18. C. complanata, Herdman. 
G. Saccus branchialis 12—13 plicis in utroque latere ornatus: 
19. C. grandis, Heller. 
HicrocosmtiSj Heller. 
Tentacula rarnosa. Saccus branchialis plicatus. Lamina dor- 
salis margine integro. Organa genitalia in utroque latere adsunt. 
A. Saccus branchialis 5 plicis in utroque latere ornatus: 
1. M. oligophyllus, Heller. 
B. Saccus branchialis 6 plicis in utroque latere ornatus: 
*) Tunica spinis magnis in apice radiatis ornata: 
2. M. echinatus, (L.). 
**) Tunica sine spinis: 3. M. Helleri , Herdman. 
C. Saccus branchialis 7 plicis in utroque latere ornatus: 
*) 4—5 fenestræ in quadris sacci branchialis: 
4. M. vulgaris, Heller. 
:,< *) 6 fenestræ in quadris sacci branchialis: 
5. M. anchglodeirus, nov. sp. 
***) 12 fenestræ in quadris sacci branchialis: 
6. M. propinquus, Herdman. 
