304 BULLETIN OF THE 



The first cluster is composed of a bundle of simple filaments. They are 

 probably undeveloped tentacular knobs. The second cluster has a botryoidal 

 shape, and is composed of small spheres closely packed together. They are 

 regarded as the female sexual bells. From the base of a single polypite hangs 

 the stump of a large tentacle, which is destitute of appendage s. 



The tastern are very characteristic in Haliphyta. They are long, flask-shaped 

 structures, and are mounted on a slender peduncle. There is no filament in 

 the tastern of the specimen studied. Their color is bright orange.* 



HIPFOPODID^. 



Gleba hippopus, Foesk. 



Figs. 31-33. 



This beautiful medusa, somewhat mutilated, was taken off Martha's Vine- 

 yard, Station 925. The nectocalyces are sufficiently well preserved to show 

 that it is identical with the Mediterranean species which is so well known, f 



In the cruise of the " Blake" in the summer of 1880, Mr. Agassiz collected 

 a second specimen of this Siphonophore in the Gulf Stream. 



DIPHYID^I. 



Diphyes, sp. 



A specimen of Diphyes too imperfect for specific determination is found in 

 the collection. 



HYDROIDA. 

 Calycopsis typa, gen. et sp. nov. 



Fig. 34. 



Several specimens of a medusa which closely resembles Turri* negl 

 Haeck. were collected. The structure of this jelly-fish is so exceptional that 

 it is given a new generic name. Bell high, without apical protuberance. Bell 

 walls thin, with external surface smooth. The inner Burface of the bell is 

 crossed by sixteen radial tubes, eacli of which passes without bifurcation 

 directly from the proboscis to the bell margin, These vessels are narrow, 

 and in alcoholic specimens resemble white lines on the surface of the bell walls. 

 Four of them arise from the point of union of the ovaries to the proboscis, 

 while three are found intermediate between each pair. The size of all is 

 uniform. 



* Mr. Emerton's notes mark what is here identified as a taster as bright orange. 

 1 ... ,, in the alcoholic specimens which were studied there wet this color. 



t A direct comparison between this and specimens of 0. hippopus brought from 

 Villa Franca show thai they are the Bams. 



