MNEMIOPSIS. 



19 



Bolina vitrea Agass. 



BoUna vitrea Agass. Contrib. Nat. Hist. U. S., Vol. m. pp. 269, 289, Fig. 93. 1860. 

 ? Bolina littoraUs McCr. On the Development of two Species of CtenophorK, 1857 ; Proc. Elliot 

 Soc. N. IL, p. 1. 1858. 



The BoUna llttoralis McCr. is probably either this 

 species, or one of our siaecies of Mnemiojosis ; but 

 not ha^dng the means to detennine this jDoint, a 

 figure (Fig. 19) of the BoUna vitrea Agass. is added 

 here, to serve as a basis for its identification here- 

 after. 



Reef of Florida (Agassiz) ; Charleston (McCrady). 



Fig. 19. 



Bolina roicroptera A. Agass. 



Bolina septentrionalis Agass. (non Mertens). Cont. Kat. Hist. U. S., HI. p. 289. 1860. 



The discovery of several species of BolinidjB on the eastern coast of 

 North America, belonging to different genera, which had all been con- 

 founded together, has induced me to examme anew the descriptions 

 and drawings of the species of Bolma observed on the northwest coast. 

 I have become satisfied that the species of Bolma here noticed is not 

 the B. se])tentrionalis of Mertens, but differs specifically from it. It 

 is quite elongated ; the lateral lobes are very short, with comphcated 

 wuadings of the long ambulacral tubes. This species resembles in out- 

 fine more the Bolina vitrea Agass. than any other. It has, hlte it, 

 a long digestive cavity, but differs from it in the jorojiortions of the 

 lateral lobes, and the complexity of the windings of the long ambulacra. 

 It is, like the B. vitrea, perfectly transparent and nearly colorless, of a 

 slight bluish tinge ; the jjolar diameter measures about two inches. 

 Found in June, in the Straits of Eosario, Washington Territory. 



Gulf of Georgia, W. T. (A. Agassiz). 



MNEMIOPSIS Agass. 



Mnemiopsis Agass. Cont. Nat. Hist. U. S., HI. pp. 269, 290. 1860. 



The genus Mnemiopsis is remarkable among the Bolinid^e for the 

 peculiar structure of the tentacular apparatus, which sends a branch 

 along a deep furrow, protected by a lappet, to the base of the auricles. 



Fig. 19. Bolina latrea seen from tlie broad side, l", V, long ambulacra; Z', P, short ambi* 

 laera ; /, ftinnel ; d, digestive cavity ; t, tentacular tube ; ;(\ )^, auricles ; Z, I, anterior and poste- 

 rior lobes ; Ti', tentacle. 



