24 U.S. NATIONAL MUSEUM BULLETIN 295 



Material. — From Ifalik Atoll, 14 living specimens. 



Dimensions. — Adult male holotype, left valve, length 1.07 mm, 

 height 0.57 mm; right valve, length 1.03 mm, height 0.59 mm. 



Distribution. — Ifalik Atoll. Possibly identified as B. crosskeiana 

 by Brady (1880) from Tonatapu, Admiralty Is., and Hawaii; (1890) 

 from Samoa. 



Affinities. — This form can be distinguished from N. schulzi schulzi 

 only by inspection of the soft parts. 



Neonesidea gerda (Benson and Coleman), 1964 



FiGUKE 7 



Bairdia gerda Benson and Coleman, 1964, p. 19, pi. 1: figs. 14-16; fig. 8. 

 Bairdia cf. B. crosskeyana Brady, Benda and Puri, 1962, pi. 5: figs. 12, 13. 



Material. — Loggerhead Key, Tortugas: 5 living specimens, in 

 vials carrying USNM 88863, 88864, 88865, and labeled as para- 

 types of Nesidea cushmani Tressler. Carapaces are decalcified and 

 difficult to study. 



Bahamas: 3 living specimens from stations Bahamas 242 and 

 Andros 65, from the collections of L. S. Kornicker. 



Florida Bay and west coast of Florida: Abundant subfossil speci- 

 mens, including holotype specimen USNM 113186, in the collections 

 of Benson and Coleman (1964). 



Dimensions.— Adult male USNM 121258 from Bahamas 242, 

 right valve, length 0.99 mm, height 0.56 mm; left valve, length 



1.02 mm, height 0.62 mm. 



Adult female USNM 121259 from Andros 65, right valve, length 

 1.04 mm, height 0.60 mm; left valve, length 1.06 mm, height 0.65 mm. 



Adult male USNM 88864 specimen 455 from Loggerhead Key, 

 right valve, length 1.02 mm, height 0.62 mm; left valve, length 



1.03 mm, height 0.65 mm. 



Distribution. — Bahamas, west coast of Florida, Florida Bay, and 

 the Florida Keys. 



Affinities. — The specimens from Tortugas and Bahamas seem 

 to be identical in soft-part characters. The copulatory organ of the 

 Tortugas male has one or two very tiny papillae on the distal surface 

 of the terminal segment that are not visible on the Bahamas speci- 

 men. The Tortugas shells are completely decalcified and cannot be 

 compared accurately with others. They are, however, the same size 

 as the Bahamas specimens. No specimens with appendages suffi- 

 ciently well preserved for study could be found in the dry collections 

 from Florida Bay and the west coast of Florida, but the subfossil 

 carapaces of B. gerda resemble the Bahamas form in shape and dis- 

 tribution of opaque pattern, differing only in their tiny size. 



