HYDROIDS OF THE WOODS HOLE REGION. 



381 



Colors. "The entoderm of the proximal part of each tentacle bulb is turquoise-green, and the 

 distal part is brownish-red. The entoderm of the proboscis and of the radial tubes in the neighbor- 

 hood of the gonads is of a delicate turquoise tinge." (Mayer.) 



Distribution. Newport, R. I. Dr. Mayer kindly allowed me to sketch the type. 



Tiaropsis diademata Ag. Fig. 100. 

 (Memoirs Ainer. Acad., vol. iv, p. 289. ) 



Bell hemispherical in adult, ovoid in young. Marginal tentacles numerous, with swollen sense- 

 bulbs at the bases of the larger ones. Otocysts 8, situated between the bases of the tentacles and each 

 containing a central dark dot with an arched row of refractile granules. Proboscis short, not reaching 

 much more thanjhalf way to the velum, and ending in four conspicuous, extensively frilled or fimbriated 

 oral arms. Radial canals 4. Ovaries long, extending nearly to the circular canal. 



Colors. Specimens in formalin have the ovaries, oral arms, and tentacle bases light green. 



Dixtriliutifm. Woods Hole, Mass. (Collected by Mr. Vinal Edwards.) 



A. 



A. Otooyst (enlarged). 



101. Epenthcsit fvlleata SIcCr. 

 A. Details of margin, o. Otocyst. s. Sense bulb. 



Epenthesis folleata McCr. Fig. 101. 

 (I'roc. Elliott Soc., vol. I, No. 1, p. 191.) 



Bell hemispherical, with thin walls. Marginal tentacles numerous, with sense-bulbs at bases. 

 Otocysts alternating with tentacle bases. Proboscis short, ending in 4 lobular mouth-arms. Ovariea 

 4, round, hanging from under radial canals nearer to margin than to proboscis. Radial canals 4. 



Color*. Proboscis light green. Tentacular bulbs red. 



Dintrlliiitiini. Newport, Rhode Island. 



Trachynema digitale A. Ag. Fig. 102. 

 (Xorth American Acalephse, p. 57.) 



Bell very deep, with an outline something like that of a bishop's miter, somewhat pointed above; 

 Marginal tentacles numerous, but most of them are usually lacking in preserved specimens. Otocysta 

 4, according to Agassiz, but they seem to be lacking in the specimens (males) that I have examined. 

 Proboscis long, reaching nearly to the velum, ending in a constricted portion bearing the mouth 

 surrounded by four lobular or finger-like mouth-arms. Radial canals 8. OvarieslS, long "sausage- 

 like" organs, reaching sometimes halfway from the upper part of the bell cavity to the velum. Velum 

 wide, strong, extensively wrinkled. 



Colors. Bell slightly pinkish. Contracted tentacles crimson at their extremity. Ovaries milky. 

 Otocysts garnet-colored. (A. Agassiz. ) 



Distribution,. Newport, Rhode Island. Woods Hole. (Vinal Edwards. ) 



