REVISION OF RECENT BAIRDIIDAE 33 



Neonesidea dinochelata (Kornicker), 1%1 



Figure 12f-m. 

 Bairdia dinochelata Kornicker, 1961, p. 65, pi. 1: fig. 4a-d; fig. 8i-o. 



Material. — One male and one female with dried fragmentary- 

 remains or appendages, in Bimini samples 22 and 93 of Kornicker. 



Diagnosis. — Carapace small, smooth, brown, highly domed with 

 flat venter, left valve much larger than right; muscle-scar pattern 

 much elongated diagonally, often appearing as only 4 long scars. 

 Numerous very thin radial pore canals. 



Copulatory organ with trough-like oblong bilamellar distal seg- 

 ment, rectangular in outline; copulatory tube moderately long and 

 curved, not piercing distal segment, reinforced medially and distally 

 by lobate projection of median segment; median segment bears 

 distally a conoid projection with a short terminal seta. Furca with 7 

 setae, setae 5, 6, and 7 extremely short. 



Dimensions. — Adult male USNM 121277, left valve, length 

 0.82 mm, height 0.44; right valve, length 0.72 mm, height 0.39 mm. 



Adult female USNM 121278, left valve, length 0.78 mm, height 

 0.47 mm; right valve, length 0.79 mm, height 0.44. 



Affinities. — This aberrant f ureal type is also displayed in A''. 

 arenigena as well as in Triebelina sertata; the carapace shape and 

 muscle-scar pattern are those of the group also containing N. paril- 

 ihamata and N. arenigena. 



Neonesidea species 1 



FIGURE 12a-e 



Material. — Anton Bruun station 412L, one living male. 



Dimensions.— Adult male USNM 121279, left valve, length 0.76 

 mm, height 0.39 mm. 



Affinities. — The carapace shape and muscle-scar pattern are 

 those of the group to which N. dinochelata and A^. parilihamata also 

 belong. The copulatory tube, median distal segments of copulatory 

 organ, and furca are very much foreshortened and of rotund propor- 

 tions. Such structures are known elsewhere only in Bairdia reticulata 

 Miiller, 1894; a presumably' unrelated form. Left valve has single 

 terminal spine, other margins are smooth. 



Neonesidea tenera (Brady), 1886 



Plate 2: Figure 4 



Bairdia tenera Brady, 1886, p. 304, pi. 39: figs. 13-15 (probably not Brady, 

 1890, p. 493, pi. 1: figs. 11-12.— Chapman, 1902, p. 422). 



Bairdia inornata A. Scott, 1905, p. 372, pi. 1: figs. 11, 12 (not Bairdia inornata 

 T. Scott, 1894, p. 136, pi. 14: figs. 40, 41). 



