no. 3613 TWO NEW CRUSTACEANS — BOWMAN AND KORNICKER 19 



The female was soaked in glycerin and its appendages examined and 

 found to be identical to the female of P. pollex. Therefore, O. mariae 

 (Baird) of Cushman, 1906, not of Baird, 1850, is placed in synonomy 

 with P. pollex. The description of specimens from the "Gulf of 

 Canso" published by Cushman (1906, p. 366, pi. 29: figs. 19-25) 

 differs considerably from P. pollex. Two glass slides containing 

 mounted ostracod appendages are in the Cushman Collection at the 

 USNM. One of these is labeled "Asterope teres (Norman) d\ Woods 

 Hole, Mass., Aug. 3, '05, (USNM 114062)"; the other is labeled 

 " Asterope teres (Norman) 9, Woods Hole, Mass., Aug. 3, '05 (USNM 

 1 14063) ." Because of the locality and collection date of the specimens 

 and because Cushman (1906) did not report the presence of A teres in 

 his publication, it is probable that the slides contain the specimen 

 upon which Cushman based his description of C. mariae. Both 

 specimens are identifiable as P. pollex. The specimen labeled "9" 

 on the slide is actually a juvenile male and this accounts for some of 

 the differences between Cushman's description of the "female" of 

 C. mariae and the female of P. pollex, i.e., the presence of 6 dorsal 

 bristles on the 3rd joint of the 1st antenna (Cushman, 1906, pi. 29: 

 fig. 22) and also a total of only 7 claws and bristles on the left 

 lamella of the furca (loc. cit., fig. 25). No explanation is available for 

 the presence of 2 slender bristles proximal to the a-bristle on the 2nd 

 endopodite joint of the mandible (loc. cit., fig. 24). Two bristles in 

 this position were observed only on the adult male of P. pollex. 

 They are present on the male of G. mariae on Cushman's slide but not 

 on the "female." Cushman (1906, p. 367) gives the length of the 

 male shell as 1.8 to 2 mm, considerably larger than adult males of 

 P. pollex. Because of the dried condition of the available specimens, 

 their length can not be accurately measured. An adult female 

 soaked in glycerine measured only 1.43 mm long, 0.78 mm high. 

 The length of the dried male in the Cushman Collection is only 1.27 

 mm in its shriveled condition. 



