REVISION OF RECENT BAIRDIIDAE 93 



Dimensions. — USNM 121386, left valve, length 1.14 mm, height 

 0.67 mm; right valve, length 1.09 mm, height 0.59 mm. 



Affinities. — These specimens are considerably larger and less 

 angulate in outline than the general population of this subspecies. 



Bythocypris prolata, new species 



Figure 46c,d 



Etymology. — Latin prolatus, extended, elongated. 



Type-specimens.— Holotype USNM 121388; paratypes USNM 

 121389-121390. 



Type-locality. — Anton Bruun cruise 7 station 380C. 



Diagnosis. — Carapace of similar structure to B. reniformis Brady 

 but much more elongate, with broadly and evenly rounded anterior 

 margin, very gently arched dorsal margin, only slightly indented 

 ventral margin, posterodorsal margin sloping steeply to obscurely 

 angulate slightly upswung posteroventral termination; lacking any 

 straight or concave segments of dorsal margin. 



Material. — Specimens, 35 from Anton Bruun stations 380 A, C at 

 Walterson Shoal, south of Madagascar, at 935 and 950 m. 



Dimensions.— Left valve USNM 121388, length 1.25 mm, height 

 0.59 mm. Right valve USNM 121389, length 1.15 mm, height 0.50 

 mm. 



Bythocypris eltanina, new species 

 Figures 47, 48, 49a-d 



Etymology. — For the USNS Eltanin, whose cruises in the south- 

 east Pacific and Antarctic regions have contributed valuable col- 

 lections of abyssal and antarctic ostracodes. 



Type-specimens. — Holotype male USNM 121391 ; allotype female 

 USNM 121392; paratypes USNM 121393-121394. 



Type-locality. — Eltanin station 1248. 



Diagnosis. — Carapace nearly equivalved, moderately inflated, 

 outlines as described for Bairdia jolini Brady, adductor muscle scars 

 divided; narrow fused marginal zone with abundant straight radial 

 pore canals. 



Distal podomere of male antenna with very short fused seta, other 

 shorter distal setae, thick segmented sensory (?) club; vibratory 

 plate of first thoracic leg with 6 long unfeathered setae, 6 other 

 nearly vestigial setae; f urea with 6 setae, setae 2 and 4 very long, setae 

 1, 3, and 5 shorter, seta 6 shortest; copulatory organ oval in outline 

 with broadly curved copulatory tube and long flexible extension. 



Material. — Four specimens living at Eltanin stations 1248 and 

 1250. 



