Mr. J. W. Fewkes on a new Physoplwre. 319 



sac by thin bands (m), which embrace the lower part of the 

 float. It is not possible for me to say that tlie arching of the 

 hood over the float, figured in my drawings, is not due to 

 contraction *. The hood may thus be more prominent in live 

 specimens than in alcoholic. 



Nectocalyces and Nectostem f. — There are no nectocalyces 



in the two specimens studied. It is possible that the hood 



{h) may be a homologue of the nectostem and the minute 



papillee rudimentary nectocalyces. The structure of Pleiiro- 



physa would seem to indicate this interpretation. 



Polyp-sac. — The enlargement below the float is known as 

 the polyp-sac. It is an inflated or globular structure, and 

 bears on its sides many highly flexible organs {ts), forming a 

 mass of filamentous bodies with members projecting at all 

 angles. Looking at the float from one side it will be seen 

 that on the same side of the float as the hood (left hand) there 

 is a cluster of sexual bodies [s) larger than the others. The 

 position of these bodies is important morphologically. 



Tasters. — The whole side of the polyp-sac below the float 

 is concealed by the tasters {ts). No filaments were observed 

 on them ; but in one or two instances bodies which may be 

 the filaments of the tasters were observed coiled at their bases. 

 It is possible that no filaments exist and that these tasters are 

 like the nectotasters of Apolemia. 



Polypites. — The polypites [pt) are contracted to globular 

 bodies and lie on the underside (opposite the float) of tlie polyp- 

 sac. Ordinarily in contraction in alcohol they bear at their 

 distal end a small button-shaped structure, formed by the 

 reflexed lips of the mouth. There are several polypites, while 

 each of these structures has longitudinal rows of " liver-cells " 

 on its inner walls. 



Tentacles and Tentacular Knobs. — The tentacles (ta) arise 

 from the bases of the polypites. The tentacular knobs were 

 easily seen in the alcoholic specimens and consist of a sac- 

 culus, a rudimentary involucrum, two terminal filaments, and 

 a terminal vesicle. 



The terminal filaments are short, stumpy (in alcohol), and 



* The description which Heeckel gives of the aurophore of his Auro- 

 nectse is so short — his paper is a preliminary one (•'System der Siphono- 

 phoren ") — that I am unable to say whether my " hood " of Floeophysa is 

 not an aurophox-e. Ploeophysa, however, does not belong to the Auro- 

 nectee, Hseckel, as no nectocalyces are developed in my genus. There are 

 other structural differences between Ploeophysa and the Aarouectse, 

 Hseckel. 



t The stem on which the nectocalyces are carried may be called the 

 nectostem ; that which bears the polyp is called the pv)lyp-stem. Tasters 

 which arise from the nectostem as in Apolemia may be called nectotasters. 



22* 



