458 



TA KU KOMM : 



can be given. In spite of this uncertainty, I have deemed it advisable 

 for the present to describe the latter as a new and distinct species. 



Genus Ocyropsis, Mayer. 



{Ocyroë, Rang.) 

 4. Ocyropsis fusca (Rang.) (Pl. VII, fig. 4). 



Ocyroë fttsca, Mosci-, 1903, p. 17. Moser, 1908, p. 65. 



Ocyroë crystallina, Mayer, 1900, p. 81, PI. xxxi, fig. 105. Moser, 1903, p, 17. 



Moser, 1908, p. 65. 

 Ocyropsis crystallina, Mayer, 1912, p. 38, PI. x, figs. 55, 56. 



Ocyroë maculata, Fewks, 1881, p. 137, PI. iv, figs. 1-4. Moser, 1903, p. 18. • 



Moser, 1908, p. 66. 

 Ocyropsis mani/, ita, Mayer, 1912, p. 40. 



The body is strongly compressed in the direction of tentacular 

 axis ; this is especially marked in large specimens (body proper over 

 40 mm. high), in which the pharyngeal axis is nearly three times as 

 long as the tentacular axis, while in smaller ones, the former is only 

 about twice as long as the latter. Vertical axis is moderately shorter 

 than pharyngeal axis. The aboral pole is subtruncate, presenting but 

 a slightly arched surface of a considerable extent. The sense-organ is 

 situated at the bottom of a shallow depression. The polar plates are 

 very narrow and unusually long, being only slightly shorter than half 

 the length of subpharyngeal rib. All ribs run parallel with one another 

 and with the pharyngeal plane of body. They begin close to the 

 sense-organ and terminate at base of lappets. The subpharyngeal ribs 

 are nearly twice as long as the subtentacular and may comprise twice 

 as many comb- plates as the latter. The comb-plates in large individuals 

 number 60-75 in a subpharyngeal and 30-40 in a subtentacular rib. 

 Lappets are well-developed, somewhat longer than 1.5 times the body 

 height, and nearly 1.5 times broader than long. They contain powerful 

 muscles which enable the ctcnophore to swimm very actively by flap- 

 ping movements of the lappets. The lappet margin is simply rounded, 



