DIPHYOPSIINAE. 247 



D. bojani Chun (incl. serrata Chun and steenstrupi Gegenbaur). 

 a . Somatocyst short, reaching only to the opening of the nectosac; 

 hydroecium deep; general form narrow. 

 D. chamissonis Huxley (= D. iveberi Lens and Van Riemsdijkj. 



B. 7 ridges from apex to base; very shallow hydroecium; nectosac short; 

 somatocyst much longer. 



Chuniphyes multidentata Lens and \'an Riemsdijk. 



2. Basolateral teeth absent; basodorsal tooth very small. 



A. Hydroecium short, truncate; somatocyst pear shaped, reaching only to 

 mid-level of nectosac. 



D. mitra Huxley ( = D. diphyoides Lens and Van Riemsdijk, = 

 hispaniana Mayer?) 



3. With neither basodorsal nor basolateral teeth. 



A. 3 ridges only at the apex. 



a^. Somatocyst straight, median. 



D. appendiculata Eschscholtz ( = D. blpariita Costa). 

 n^. Somatocyst curved to the right, ventral facet asymmetrical. 



D. contorta Lens and Van Riemsdijk. 

 R. 4 ridges at the apex. 



rt\ Nectophore spirally twisted, fusiform; somatocyst straight. 



D. spiralis, sp. nov. 

 a^. Nectophore not spirally twisted, somatocyst curved to the right. 



D. contorta Lens and Van Riemsdijk. 



C. Constantly 5 ridges at the apex. 

 o\ Hydroecium very shallow. 



Somatocyst spherical or pear shaped, lying transverse to the 

 main axis of the nectophore. 

 D. fowler i Bigelow. 

 a . Hydroecium almost entirely suppressed. 



1. Somatocyst of the ordinary fusiform type, reaching to \ the 

 length of the nectophore. Apex pointed. 



D. subtiloides Lens and Van Riemsdijk. 



2. Somatocyst thread-like with a large spherical terminal dila- 



tion. Apex rounded. 

 D. subtilis Chun. 

 Diphyes arctica Chun is omitted as no details as to the number of ridges are 

 given in Chun's description. It is easily distinguished from all other species 



