16 CTENOPHORES OF THE ATLANTIC COAST OF NORTH AMERICA 



inner end of the stomodaeum contains dull-yellow and reddish-brown 

 pigment. The 2 tentacle-bases are closely pressed to the sides of the 

 paragastric canals. Their lower ends are simple, not hooked, and extend 

 slightly below the level of the lower ends of the 8 meridional vessels. 

 The tentacle-sheaths are voluminous and long, and taper upward so 

 as to open to the outside slightly below the level of the aboral ends 

 of the rows of combs. The tentacles bear a pair of cock's-comb-shaped 

 ■expansions upon the upper sides of their bases. They also give rise to 

 numerous, simple, filamentous side branches and a few more or less 

 hand-shaped appendages at very irregular intervals. The side branches 

 of the tentacles are slightly yellow. The canal-system and other parts of 

 the entoderm of the animal are slightly milky, other parts being trans- 

 parent. 



This ctenophore is not common either in the Mediterranean or at 

 Tortugas, Florida. It is beautifully figured by Chun, 1880, in his Naples 

 Monograph of the Mediterranean Ctenophoras. 



Genus TINERFE Chun, sens. ampl. 



Ute, Chun, 1889, Sitzungsber. Akad. Wissen., Berlin, Jahrg., 1889, p. 525. 

 Ute, preoccupied by Schmidt for Sponges. 



Tinerfe, Chun, 1898, Ergeb. der Plankton-Exped., p. 6. — Moser, 1909, Cteno- 

 phoren der deutsche Sudpolar-Expedition, Bd. 11, Zool. 3, p. 131. 



Chun defines this genus of the Cydippidae as follows: 



Body cylindrical, only slightly compressed in the stomodasal plane. 



Two kidney-shaped, gelatinous protuberances project above the apical 



sense-organ in the funnel-plane. Paragastric vessels well developed. 



Tentacle-bases long. Genital products developed only in the 4 subten- 



:tacular meridional vessels. 



The generic designation cited above applies to two small Ctenophorae 

 from Tortugas, Florida, with the exception that the gelatinous sweUings 

 flanking the sense-organ are mammiform in one and papilliform in the 

 other species, not kidney-shaped, and the genital products are developed 

 in all of the 8 meridional vessels. Also the tentacle bases of one species 

 are short, not long. We might profitably amplify Chun's definition of 

 the genus and avoid stating the precise shape of the protuberances on the 

 sides of the apical sense-organ, and omit the restriction that the genital 

 products develop in only 4 of the meridional vessels, for this is probably 

 only an indication of immaturity; or that the tentacle-bulbs be either 

 long or short. 



We would thus ampUfy Chun's definition to read as follows: Cydip- 

 pidffi with nearly cyHndrical body, only slightly compressed in the stomo- 

 d£eal-axis. With protuberances in the funnel-plane on both sides of the 

 apical sense-organ. Paragastric canals well developed. Tentacles sunken 

 within sheaths in the funnel axis. Tentacles with lateral filaments. 



Chun's Tinerfe cyanea from the Canary Islands is the smallest cteno- 

 phore known, being only 2 to 2.5 mm. long when mature. The Tortugas 

 forms, Tinerfe lactea and T. beehleri, are also very small, being only 

 c9 mm. long. The type species is Tinerfe cyanea Chun. 



