194 



PARYPHA. 



Medusa, from the base of the single largely-developed tentacle, is a 

 feature it has in common with other Medusas which have been referred 

 by various writers to the genera Sarsia and Steenstrupia, and which 

 very probably are all derived from a Tvibularian nurse similar to Hy- 



Fig. 326. 



Fig. 328. 



Fig. 327. 



bocodon. Should the Diplonema of Greene prove to be one of these 

 asymmetrical Medusas, the name Hybocodon must give way to that of 

 Diplonema. 



Massachusetts Bay (L. Agassiz). 



Cat. No. 61, Nahant, Mass., May, 1862, H. J. Clark. Hydrarium. 



Museum Diagram, No. 23, after L. Agassiz. 



PAKYPHA Agass. 



Parypha Agass. Cont. Nat. Hist. U. S., IV. p. 342. 

 Pyxidium Leuck. ; in Arcliiv f. Nat., I. p. 31. 1856. 



18G2. 



Parypha cristata Agass. 



Priri/pJia crhlala Agass. Cont. Nat. Hist. U. S., IV. p. 342. 18G2. 

 TuOuhiria crislata McCr. Gymn. Charleston Harbor, p. 54. 



Charleston, S. C. (McCrady). 



Cat. No. 14, Sullivan's Islands, S. C, December, 1851, L. Agassiz. 



? Cat. No. 16, Florida, 1850, L. Agassiz. 



Fig. 326. Hybocodon prolifer Af;ass., seen from the broad side, r, proboscis; r, o, radiating 

 tul)es ; .•-', circuhir tube ; m, buds of Me(hisa> at base of long tentacle, I. 



Fig. 327. Hybocodon prolifer, seen facing the long tentacle, a, point of attachment to Hy- 

 drarium ; h, c, radiating tubes ; e, rows of lasso-cells extending from base of tentacle to abactinal 

 pole ; o, proboscis ; /, Medusa; budding from base of long tentacle, t. 



Fig. 328. Medusa bud of Hybocodon. a, base of attachment; o, proboscis ; b, c, chymiferous 

 tubes ; (/ and near c, Medusa; buds at base of tentacle, I. 



