HYDROMEDUSAE, SIPHONOPHORES, AND CTENOPHORES. 305 

 PHORTIS ELLICEANA Agassiz and Mayer. 



Plate 41, figs. 3-7. 



Phortis elliceana Agassiz and Mayer, 1902, p. 146, pi. 2, figs. 5-7. — Mayer, 

 1910, p. 309, fig. 170. 



Phortis elliceana — material examined. 



In the preserved condition the bell is flat and its cavity very shal- 

 low, though the gelatinous substance is rather thick. The peduncle 

 is thick, cylindrical, stiff, and as long as or longer than the diameter 

 of the bell. Its stoutness, solidity, and nearly uniform diameter 

 throughout its unusual length are excellent field marks. A shallow 

 bell, very long, though slightly narrower peduncle, is shown in the 

 figure of elliceana, by Agassiz and Mayer. 



Marginal organs. — No one of the specimens was in good enough 

 condition to allow a survey of its entire margin, but individual 

 quadrants could be studied in several. 



(a) In a quadrant in a specimen 8 mm. in diameter there was one 

 interradial tentacle, 7 tentacular knobs, and about that number of 

 otocysts. 



(b) 13 mm. in diameter; one-fifth (there are 5 canals in this speci- 

 men), 3 interradial tentacles, 11 knobs, 14 otocysts. 



(c) 23 mm. in diameter, 1 quadrant, 2 interradial tentacles, 22 

 knobs, 27 otocysts. In the next quadrant there are four interradial 

 tentacles. 



(d) 30 mm. in diameter, 5 interradial tentacles, 27 knobs, 30 oto- 

 cysts. In this specimen there were about 25 tentacles, both radial and 

 interradial, and upward of 90 knobs. 



In the specimen described by Agassiz and Mayer, 16 mm. in diame- 

 ter, there were four large radial tentacles, 12 interradial ones, 3 per 

 quadrant, about 40 knobs, and 56 otocysts. So far as the specimens 

 show there are always about as many or a few more otocysts than 

 tentacles and knobs combined. They usually alternate with the 

 tentacular structures, but I have seen two between two knobs, and in 

 one instance 4 knobs with no intervening otocysts. Some of the knobs 

 have threadlike filaments; others do not, probably as the result of 

 contraction. 



