MUSEUM OF COMPARATIVE ZOOLOGY. 275 



in Rhizophysa. I have already (Bull. Mus. Comp. Zool., VI. 7) compared the 

 undeveloped knob of Physophora hydrostatica and that of Athorybia. 



The tastern* (fig. 13) of A. formosa are very long, highly flexible bodies of 

 pink color, protruding through the spaces left between adjacent covering scales. 

 They are in contmued motion, and resemble, with the exception of their color, 

 more the filamentous bodies found between the swimming-bells of Apolemia 

 than true tastern. Their tips bear several large thread-cells. They were not 

 observed to bear tentacles. 



A. formosa is monoecious. The female bells (fig. 12) are borne on short stems,f 

 and have a botryoidal shape. Each bell contains a single ovum. The course 

 of the chymiferous tubes in the bell walls is similar to that in Agalma. The 

 male bells (fig. 11), like the female, take the form of grape-like clusters on 

 short stems. They are smaller than the female. The male and female clusters 

 are colorless, and the bell- walls transparent. J 



Praya, sp. 



Fragments of a large Praya, too mutilated for specific identification, were 

 taken on two occasions at the Tortugas Islands. Diplophysa, sometimes called 

 the diphyizoid of Praya, has been taken in Narragansett Bay.§ It was not 

 collected in Florida. 



Galeolaria aurantiaca, Vogt.n 



Plate VI. Fig. 26. 



Galeolaria (Epibulia) was taken on two occasions. It is unfortunate that 

 only the posterior nectocalyx was found. Although this is sutficient to deter- 



* Huxley (op. cit.) does not mention these structures in his Athorybia. Kolliker's 

 description of them is much the same as that which is here given. The tastern of 

 the two species seem to have much the same form. 



t Huxley (op. cit., p. 87) says that in his Athorybia a single stem bears both male 

 and female bells, as well as small tastern. According to KoUiker (op. cit., p. 28), 

 the male bells in A. rosacea are isolated, and a single male bell is found with a grape- 

 like cluster of female bells near the base of a polypite. In A. formosa male and 

 female bells are found in clusters of about equal numbers. 



X My measurements of the size of A. formosa are about the same as those given 

 by KoUiker for A. rosacea. They are larger than Forskal's or Huxley's measure- 

 ments of the Athorybice which they had. A. formosa is half an inch in diameter 

 .(distance taken at right angles to the axis, when covering-scales are extended). 



§ Bulb Mus. Comp. Zool., VI. 7, and VIII. 8. 



II Surles Siphonophores de la Mer de Nice. Mem. de I'lnst. Genev., I. pp. 72, 73, 

 PI. IV. figs. 12, 13. 



Since my return from Florida, the U. S. Fish Commission has sent me a specimen 

 of Gleba hippopics, Forsk., and two new Physophores for identification. Gleba 

 was also collected by Mr. Agassiz in the cruise of the "Blake" along our eastern 



