REVISION OF RECENT BAIRDIIDAE 113 



Anchistrocheles? angulata (Brady), 1870 



Figure 60/i 



Bairdia angulata Brsidy, 1870, p. 199, pi. 27: figs. 11, 12.— Brady, 1880, p. 59, 



pi. 11: fig. 5a-d. 

 Anchistrocheles f, new species, of Triebel, 1960, pi. 20, fig. 44a-b. 



Material. — A single juvenile right valve from RM1004, George 

 Sound, New Zealand. 



A single juvenile collected living at Eltanin station 740. 



Dimensions. — Juvenile right valve USNM 121635, length 0.51 mm, 

 height 0.29 mm. 



Distribution. — ^Described originally from the Straits of Magellan; 

 a very similar form was reported by Triebel (1960) from Bass Strait. 



Affinities. — The Eltanin specimen is smaller than the lectotype- 

 designate (Brady, 1870) but otherwise similar to it. The New Zealand 

 specimen is very much smaller and relatively more elongate. 



The assignment to Anchistrocheles is based on the compressed cara- 

 pace and bythocyprid scar. Eventually another generic category may 

 be desirable to accommodate this species, A. aculeata Miiller, and 

 others with bairdian outlines. 



Anchistrocheles? sp. aff. A. aculeata Miiller, 1908 



Figure 60m 

 Anchistrocheles aculeata Miiller, 1908, p. 1, pi. 14: figs. 7-14; pi. 15: figs. 1-5. 



Material. — Six valves collected at Albatross station 4693, west of 

 Peru, at a depth of 1142 fms. 



Dimensions. — USNM 121637, left valve, length including spines 

 1.07 mm, length excluding spines 0.92 mm, height 0.55 mm. 



Affinities.— -4. aculeata Miiller has more gently rounded lateral 

 outline and has eight small spines along the anterior margin rather 

 than the single long spine of this species; its posterodorsal margin 

 slopes less steeply to the smaller spine located near midheight. Both 

 species have bairdian outline, long terminal spine on left valve, 

 thickly pitted exterior, and bythocyprid muscle-scar pattern. Miiller's 

 species was collected at 385 m. depth at the Gauss station, Antarctica. 

 As illustrated by Miiller, the mandible and maxilla are attenuate as 

 in Anchistrocheles, but the other appendages show normal proportions 

 and podomere-segmentation of Paranesidea. 



Anchistrocheles bensoni, new species 



Figures 61, 62 



Etymology. — Named for Richard H. Benson, who collected this 

 and other exceptionally interesting ostracodes from Walterson Shoal 

 (under unusual hardships, including two broken ribs) during his 

 participation in cruise 7 of the Anton Bruun, International Indian 

 Ocean Expedition. 



327-237 O - 69 - 9 



