422 



MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



We find in Nematodiniiim the same types of ocellus which have appeared 

 in other genera of the Poiichetiidae, in Protojjsis, Pouchctia, and Erythropsis. 

 These two tyjDcs have been utilized by us to distinguish subgenera in the last 

 two genera. HowcA-er, in view of the small number of species as yet known 

 in Nematodinium, no subgenera are here established therein, although the same 

 basis exists therefor. 



Key to Species of Nematodinium 



1. Ocellus distrilrated, mimerous small spheroidal lenses, raelanosome diffuse 



- partitum sp. nov. 



1. Ocellus concentrated 2 



2. Lens splierieal, melanosome subhemispherical armatum (Dogiel) 



2. liOns elongated, melanosome very small, band-shaped torpedo sp. nov. 



Fig. NN. Nematodinium gen. nov. 1. N. armatum Dogiel). 2. Second individual of the same species. 

 3. N. torpedo sp. nov. 4. N. partitum sp. nov. X 500. 



Nematodinium armatum Dogiel 



Plate 11, figure 122; text figure NN, 1, 2 



Pouchetia armata Dogiel (1906), pp. 36-38, 42, pi. 2, figs. 48, 49. Symmetry reversed in 



drawing. 

 P. armata, Klebs (1912), p. 430. 

 P. armata, Cavers (1913), p. 183. 

 P. armata, Lebour (1917&), p. 198. 

 P. armata, Chatton (1914), p. 435. 



Dlvgxosis.^ — A medium sized species, body subellix)soidal, its length 1.55 

 transdiameters ; girdle a descending left spiral of 1.5 turns, displaced 0.75 trans- 

 diameter ; sulcus extending far on epicone and coiled distally around hypocone 

 with a total of 1.25 turns; ocellus far posterior, simple, lens spheroidal, pig- 

 ment mass subhemispherical, lilack; nematocysts grouped about the nucleus. 

 Length, 95-1 00/*. Mediterranean; Plymouth Sound; Pacific at La Jolla, July, 

 August. 



