MARINE INVERTEBRATA OP GRAND MAN AN. 11 



might also be considered, as bearing on this question, that the medusa; of Tuhularla 

 never become free, as in the Corynidai. 



It follows, also, from the above, that the species just described, having basal tcnta- 

 cula, is inferior to Curjne and its allies, in which tliey never appear, so that it is 

 correctly classed between that genus and Tuhularia; and if, as is probable, the single 

 circle of tentacula in the Scrtulariadw is homologous with the basal tentacula of 

 AcauUs and Tnhiihn-ia, it would follow that that famil}' sliould stand lowest in the 

 scale. Thus, as will be seen in the arrangement of the hjdroids in this paper, it 

 is a reversal only of the series followed in Johnston's work which is proposed, 

 without derangement of the grouping of tlie fiimilies. 



IItdractinia eciiinata, Johnst. Alcyonium ecldnafiim, Auct., Gould, Inv. Mass. 



Clava multicornis, Johnst. Gnryne squamata, Miill., etc. 



Under these two names are probably included the polype forms of several species 

 of our North Atlantic naked-eyed medusae. 



PROLES MEDUSINxE. 



Among the very numerous species of medusae observed in this region, the 

 following only were identified. The notices I prepared of new species, owing to 

 the circumstances under which they were observed, are too short for publication. 



Sarsia mirabilis, Agass., Mem. Am. Acad., 2d ser. iii. 224, pi. iv. 



IIlPI'OCRENE SUPERCILIARIS, Agass., 1. c, 250, pi. i. 



Staurophora laciniata, Agass., 1. c, 300, pi. vii. 



AuRELiA AURiTA, Miill., Gould, Inv. Mass. 



Cyanea PosTELSir, Gould., Inv. Mass. A Strohila of large size, probably the 

 polype form of this Cyanea, was taken in various stages of development, in 30 

 fathoms, on the Hake Ground. It was' of a light salmon color, with very long 

 superior tentacula, which it used in walking inverted on the bottom of the sea. 



13ER0ID MEDUS.E. 



Pleurobrachia rhododacttla, Agass., 1. c, 313, Part ii., pi. i. 

 BoLiNA Ai.ATA, Agass., 1. c, 340, Part ii., pi. vi. 



