CLASSIFICATION OP THE TUNICATA. 571 



2 r Peduncle sublateral B. ovifera, Linn. (N. Atl.) 



[ Peduncle terminal and median 4 



^ / Body subreniforra B.re7iiformis'^,'M.a,cL. (Arct.) 



\ Body elongate- ovate 5 



(Branchial aperture on same lerel with peduncle ; apertures sessile. 

 B. elegans, Herdm. (N. Atl.) 

 Branchial aperture not on same level with peduncle ; apertures pro- 

 minent B.ftisiformis,Ssiy. (Arct.) 



q f With large lobes or tubercles from the test 6 



I With no such projections 7 



P f No spicules in the branchial sac B. gihbosa, Heller. (Austr.) 



i With spicules in the branchial sac ... B. tuberculata, n. sp. (Austr.) 



(Body much elongated, narrow fusiform. 

 B. Bolteni, Linn. (Arct.) 

 Body not so elongated B. fachydermatina, Herdm. 



(S. Pac, Austr.) 



CtstijSTGIA, MacLeay, 1821. 



Body ovate, attached to a very short peduncle. Brauchial 

 aperture 4-lobed, atrial irregular, both sessile. 



Test subcoriaceous. 



Branchial sac with longitudinal folds (about fourteen). The 

 transverse vessels and longitudinal bars form a loose meshwork 

 not divided into true stigmata by fine longitudinal vessels. 



Tentacles compound. 



Alimentary canal on left side; stomach very long. 



Gonads on both sides of body. 



There is only one species known, Cystingia Griffithsii, Mac- 

 Leay, brought from the Arctic Seas near "Winter Island by 

 Mr, W. N. Griffiths, who accompanied Captain Parry. 



The following species, probably belonging to Boltenia, are in- 

 sufficiently characterized and cannot be placed : — 



Boltenia rubra, Stimpson. (E. N. Am.) 

 B. microcosmus, Ag. (E. N. Am.) 

 B. BurJchardti, Ag. (E. N. Am.) 

 B. ciliata, MoUer. (Arct.) 

 B. atistralis, Q. & G-. (Austr.) 

 B. spinifera, Q. & Gr. (Austr.) 



FuNGULUS, Serdman, 1882. 



Body globular, borne on a short thick peduncle attached to the 

 anterior end. Branchial aperture triangular, atrial bilabiate. 

 Test cartilaginous, but very thin, not modified on the peduncle. 



* Ascidia clavata, Fabr., may be this species. 



