80 



PLATYPYXIS. 



PLATYPYXIS Agass. 



Platypyjcis Agass. Cont. Nat. Hist. U. S., IV. pp. 306, 354. 1862. 



Platypyxis cylindrica Agass. 



Chjtia ^Platypyxis) cylindrica Agass. Cont. Nat. Hist. U. S., IV. pp. 306, 354 {noti PL 27, Figs. 



8, 9) ; p. 307, Figs. 42-44 {non Fig. 41). 1862. 

 Campanularia voluhllls Leidy. IVIar. Inv. Faun. N. Y. and R. I., p. 6. 1853. 

 CaiiijHinul<trla noUformk JIcCr. Gymn. C'harl. Harb., p. 92, PI. 11, Fig. 4. ? 



The reproductive calycle is conical, smooth, strongly compressccl in 

 one direction, with a slight constriction near the free end, ■which flares 

 outwards (Fig. 112); there are from three to four young Medusae 

 developing simultaneously, though only one seems to escape at a 

 time, and not several in close succession, as is the case with Laomedea ; 

 the Medusa nearest the upper extremity occupies more than half of 

 the whole space ; there is uothmg here like the corrugations which 



Fig. 114. 



Fig. 112. 



Fig. 113. 



Gosse has figured in his C vohihUis, or of the spur which projects 

 beyond the point of attachment of the calycle ; when seen edgeways, 

 the calycle is strongly bent at the base (Fig. 113), and the upper edges 

 do not flare out, as when seen from the broad side. The Hydrarium 

 (Fig. 114) is found in shady places, near low-water-mark, and imme- 

 diately beyond it ; largest specimens about an eighth of an inch m 

 height. 



Charleston, S. C. (McCrady) ; Point Judith (Leidy) ; Massachusetts 

 Bay, Nahant (L. Agassiz) ; Buzzard's Bay, Naushon (A. Agassiz). 



Cat. No. 141, Naushon, Sept. 1861, A. Agassiz. IlydromtMliisarium. 



Cat. No. 142, Nahant, Mass., Sept. 1854, H. J. Clark. , Hydrarium. 



Fig. 112. Riproiluctive calycle of P. cylindrica, seen from the broad side- 

 Fig. 113. The same, seen from the narrow side. 

 Fig. 114. Sterile Hydra of P. cylindrica. 



