194 



PARYPHA. 



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

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

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

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



Fig.327. 



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

 asymmetrical Medusae, 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. Ag-assiz. 



PARYPHA Agass. 



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

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



Parypha cristata Agass. 



Parypha cristata Agass. Cont. Nat. Hist. U. S., IV. p. 342. 18G2. 

 Tubularia cristata 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 Agass., seen from the broad side, v, proboscis; r, o, radiating 

 tubes ; s, circular tube ; m, buds of Medusa; at base of long tentacle, (. 



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

 drarium ; 6, c, radiating tubes ; e, rows of lasso-cells extending from base of tentacle to abactinal 

 pole ; 0, proboscis ; /, Medusje budding from base of long tentacle, t. 



Fig. 328. Medusa bud of Hybocodon. a, base of attachment; o, proboscis ; 6, c, chymiferous 

 tubes ; d and near c, Medusae buds at base of tentacle, t. 



