72 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



Schisturella cocula, new species 



(Figs. 18, 19) 



Diagnosis: Third pleonal epimeron with posteroventral tooth; palm 

 of gnathopod 1 scarcely distinct from posterior margin of article 6 ; lobe 

 of upper lip tapering ; eyes present. 



Holotype: AHF No. 589, male, 6.7 mm. Unique. 



Type locality: Station 5996, off Pt. Conception, California, 

 34°-23'-05" N, 120°-26'-45" W, 162 m, December 16, 1958. 



Remarks: Tubular accessory gills are present on coxae 5 and 6. 



Schisturella zopa, new species 



(Fig. 20) 



Diagnosis: Third pleonal epimeron with a tooth at the postero- 

 ventral corner ; palm of gnathopod 1 transverse ; lobe of upper lip taper- 

 ing ; eyes absent. 



Holotype: AHF No. 5413, ?male, 2.9 mm. Unique. 

 Type locality: Station 2847, Catalina Canyon, 33°-22'-30"N, 

 1 18°-36'-38"W, 914 m, June 23, 1954. 



Remarks: Gills were not satisfactorily analyzed. The process on 

 the third peduncular article of antenna 2 is obsolescent. An aesthetasc 

 but not a spine is present on the distal end of article 1 of the first an- 

 tennal flagellum. 



Sophrosyne robertsoni Stebbing and Robertson 



(Figs. 21, 22) 

 Sophrosyne robertsoni Stebbing and Robertson 1891: 31-34, pi. 5A ,• 

 Stebb^ng 1906: 21-22. 



Basin material: 6832(2), Tanner Basin, 1298 m. 

 Remarks: The crucial identifying characters of this species, forming 

 a combination distinct from the other two species of the genus, S. his- 

 pana (Chevreux) and S. murrayi Stebbing, are as follows: the shape 

 of gnathopod 2, the furnishment of its palm with tasseled setal bun- 

 dles, the shape of the third pleonal epimeron with a narrow but long 

 posterior tooth, the dorsal configuration and lateral ridges of urosomite 

 1, the poor ventral extension of article 2 on pereopod 5, and the short 

 cleft of the telson. Dim brownish-purple lateral spots may form the ves- 

 tigial eyes, although Stebbing and Robertson did not perceive eyes. This 

 is the first record of this strange genus since the original descriptions of 

 the three species in 1887, 1888 and 1891. 



Thrombasia, new genus 

 Diagnosis: Basal articles of both flagella on antenna 1 elongated; 

 upper lip very strongly lobate in front ; molar of mandible rather weak, 



i 



