72 U.S. NATIONAL MUSEUM BULLETIN 260 



of both males and females of at least one species, S. totorami, new spe- 

 cies. The lateral surface of article 3 has the process at the postero- 

 clistal corner and the medial surface has the process on the mid-distal 

 margin. 



Male third uropods apparently are more setose than those of females 

 and in S. zopa the third pleonal epimera differ slightly between the 

 two sexes. 



Key to the Species of Schisturella 



1. Pleonal epimeron 3 with posteroventral tooth distinctly separated from body 



of epimeron 2 



Pleonal epimeron 3 lacking posteroventral tooth but occasionally posteroven- 

 tral corner sharp or slightly attenuated 5 



2. Palm of guathopod 1 very oblique, obsolescent 4 



Palm of gnathopod 1 transverse or slightly oblique, fully evident 3 



3. Palm of gnathopod 1 perfectly transverse ; pleonal epimeron 2 rounded-quad- 



rate posterodistally ; epimeron 1 with adze-shaped anterior extension, no 



tooth S. zopa J. L. Barnard 



Palm of gnathopod 1 oblique ; pleonal epimeron 2 with protruding posterodis- 

 tal subacute angle ; epimeron 1 not adze shaped, with strong anteroventral 

 hook S. totorami, new species 



4. Eyes absent S. grabenis, new species 



Eyes present S. cocula J. L. Barnard 



5. Upper lip with large anterior lobe strongly projecting in front of epistome . 6 

 Upper lip scarcely lobate, nearly flush with epistome . . S. abyssi (Chevreux) 



6. Eyes present, palm of gnathopod obsolescent, extremely oblique. 



S. pulchra Hansen 

 Eyes absent, palm of gnathopod 1 present and transverse 7 



7. Telson cleft one third its length S. adversicola (K. H. Barnard) 



Telson cleft one half its length 8 



8. Coxa 1 hemi-oval S. robusta robusta (J. L. Barnard) 



S. robusta cedrosiana, new subspecies 

 Coxa 1 subconical, anteroventrally extended . . S. rotundala (K.H. Barnard) 



Schisturella abyssi (Qievreux), new combination 



Figures 31, 32 



Pseudonesimus ahyssi Chevreux, 1926, pp. 3-5, fig. 2 



Description of material at hand. — Lateral cephalic lobe sym- 

 metrically mammilliform, blunt apically ; eyes absent ; epistome deep, 

 slightly convex, labral process small, rounded, slightly projecting; 

 mandibular molar small, densely ridged, bearing digressive setulose 

 ridge ; lower lip with slightly excavate anterior margins ; coxa 1 about 

 60 percent as long as coxa 2, anterior and posterior edges parallel, 

 ventral margin symmetrically rounded, article 2 of gnathopod 1 about 

 1.3 times as long as coxa 1 ; coxae 2-A neither strongly overlapping nor 

 grossly unequal in length ; article 6 of gnathopod 1 longer than article 5, 

 palm slightly oblique and slightly S-shaped, dactyl with small acces- 



