9G8 



REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



[42] 



(lififerences. The very great disparity in size of the two strikes one at 

 first glance. Studer says that the stem of inermis is IS*"" in length, and 

 the diameter of the float is I*'™. These measurements for the length of 

 the stem may not be diftereut from the dimensions of a comj)lete axis of 

 uvaria^ but the diameter of the stem and float is much larger in inermis 

 than in uvaria. 



Ehizophysa, sp. 



{Gigantic float.) 



In a fragment of the float and stem of an unknown Bhizophym^ the 

 diameter of the float is 1"°^ and its leugth 3™". This is, I think, the larg- 

 est float of a Physophore, next to thatof P/ty.s-aZwT, Ancjela, and Angelopsis, 

 which has yet been recorded. It is unfortunate that the essential or- 

 gans, polypites and tentacles, of this gigantic Bhizophpsa are wanting, 

 and I am unable to tell to what species it belongs. It has at the base 

 of the float, at its junction with the stem, a small cluster of half- 

 developed bodies which resemble polypites. 



PterophysAj gen. nov. 



(Plato X.) 



Two specimens of Rhizophysidre, taken from the "dredge rope" at 

 Station 2227, are referred to a new genus, Pterophym. 



This genus, with a general likeness to Ehizophysa., is characiterized by 

 the existence on the polypites of two longitudinal wings,* which extend 



* Studer {op. cit.) first described these wings (pt.) in his species of JiMzophysa, called 

 conifera. He says of them : " Iiu liiutereu Magenabschnitt (Fig. 17) fangen zwei mus- 

 kulose solide Leisten, eine dorsale und eiue veutrale, sich zu bilden an, die sich mm 

 auf den Basaltheil des Polypeu, als flligelformige Haftbiinder fortsetzen und an den 

 Stamm sich auheften (Fig. 18). Diese Biiuder bestehen aus einem soliden Gallertkern, 

 eiuer Fortsetzung des Mesoderms, der am Eaude zahlreiche Ausliiufer in das Ectoderm 

 sendet, woran sich die Lliugsmuskelfasern, -wie am Stamm festsetzeu." 



I cannot find any function suggested for these bands, and I am also in doubt as to 

 the purpose of the dendritic bodies on their free margin in conifera. There are homol- 

 ogous structures in the cross-sections of a Bathyphijsa " polyp," as shown in Plate II, 

 Figs. 32, 33 of Studer's paper. 



