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, Rhode Island. Dr. Mayer kindly allowed me to sketch the type. 
Tiaropsis diademata Ag. Fig. 100. 
(Memoirs Amer. Acad., vol. xv, p. 289. ) 
Bell hemispherical in adult, ovoid in young. Marginal tentacles numerous, with swollen sense- 
bulbs at the bases of the larger ones. Otoeysts 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 than half 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. 
Distribution. — Woods Hole, Mass. (Collected by Mr. Yinal Edwards.) 
Bell hemispherical, with thin walls. Marginal tentacles numerous, with sense-bulbs at bases. 
Otoeysts alternating with tentacle bases. Proboscis short, ending in 4 lobular moutli-arms. Ovaries 
4, round, hanging from under radial canals nearer to margin than to proboscis. Radial canals 4. 
Colors. — Proboscis light green. Tentacular bulbs red. 
Distribution. — Newport, Rhode Island. 
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. Otoeysts 
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. Ovaries 8, long “sausage- 
like” organs, reaching sometimes half way 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. 
Otoeysts garnet-colored. (A. Agassiz. ) 
Distribution. — Newport, Rhode Island. Woods Hole. (Vinal Edwards. ) 
100. Tiaropsis diademata kg. A. Otocyst (enlarged). 
101. Epenthesis folleata McCr. 
A. Details of margin, o. Otocyst. s. Sense bulb. 
Epenthesis folleata McCr. Fig. 101. 
(Proe. Elliott Soc., vol. i, No. 1, p. 191.) 
Trachynema digitale A. Ag. Fig. 102. 
(North American Acalephee, p. 57.) 
