26 U.S. NATIONAL MUSEUM BULLETIN 295 



The specimen illustrated by Benda and Puri (1962, pi. 5: figs. 12, 

 13) as B. cf. B. crosskeyana is undoubtedly B. gerda. However, the 

 form identified as B. crosskeyana Brady by Puri (1960, p. 130, pi. 6, 

 figs. 11, 12) is a distinct though related species more closely allied 

 with such species as A^. dinochelata and A^. parilihamata. 



Bairdia longisetosa Brady, 1902, described from St. Thomas I., is 

 very similar to B. gerda in outline views, and examination of syntype 

 or topotype material might very likely establish their synonymity. 

 The specimen identified and illustrated by Bold (1966, p. 45, pi. 2: 

 fig. 7a,b) as B. longisetosa Brady from Colon Harbor, Panama, for 

 which both B. crosskeyana Brady of Puri (1960) and B. gerda Benson 

 and Coleman are listed as synonyms, is more elongate and of more 

 sinuous outline, especially in the right valve; it more closely resembles 

 N. gierloffi (Hartmann). 



N. gierloffi (Hartmann), 1959, described from the Pacific coast of 

 El Salvador, has a much more elongate and sinuous carapace outline 

 and slightly different distal outline of the male copulatory organ. It 

 is presumably closely related. 



Neonesidea antonbruuna, new species 



Figure 8o-r 



Etymology. — For the Research Vessel Anton Bruun, whose cruises 

 were a major part of the U.S. Program in Biology of the International 

 Indian Ocean Expedition. 



Type specimens. — Adult male holotype USNM 121261; paratypes 

 USNM 121262. 



Type locality. — Anton Bruun cruise 7 station 38 IB, near Walter- 

 son Shoal. 



Diagnosis. — Carapace small, elongate, and streamlined; anterior 

 margin of right valve minutely serrate, of left valve smooth; posterior 

 margin of right valve smooth, of left valve denticulate. Muscle-scar 

 pattern composed of 3 rows of 2 elongate scars each and an inserted 

 wedge of 2 scars. Copulatory organ of male with projecting rodlike 

 distal piece. 



Material. — Ten living specimens and 40 subfossil specimens at 

 Anton Bruun station 38 IB. 



Dimensions.— Adult male USNM 121261, left valve, length 0.69 

 mm, height 0.40 mm; right valve, length 0.68 mm, height 0.35 mm. 



Affinities. — This is just one of a very widespread complex of 

 forms with this general carapace shape and muscle-scar pattern. 



Neonesidea cracenticlavula, new species 



Figure 8a-n 



Etymology. — Latin cracens, slender + clavulus, diminutive of 

 nail. 



