NO. 3580 OSTRACOD FAMILIES — KORNICKER 23 



about half the length of the 4th claw, but it is almost the same length 

 of the 4th claw on P. Joveolatus. Also, Brady and Norman's speci- 

 mens have 13 to 14 medial bristles on the rostrum of the carapace 

 compared to only 4 on Pseudophilomedes joveolatus. Specimens 

 collected and described by Brady and Norman conform in every way 

 to males of Euyhilomedes; there is no basis for considering them to be 

 males of Pseudophilomedes, which unfortunately remain unknown. 



Euphilomedes asper (Miiller, 1894) was described by Miiller from 

 males collected from the Bay of Naples. His description of the species 

 mentions only the 2nd antenna, the furca, and the external morphology 

 of the carapace; the secondary appendage of the 2nd antenna, the 

 furca, and the outside of the carapace are illustrated. It is difficult to 

 identify a species with certainty having so few characters for compar- 

 ison. The specimens of Brady and Norman considered by me to be 

 E. asper (Miiller) have a carapace and secondary branch on the 2nd 

 antenna identical to that illustrated by Miiller. The furca on Brady 

 and Norman's specimens has the same number of furcal claws as in 

 Miiller's illustration and a similar distribution of primary and second- 

 ary claws, but it differs in one respect: the 3rd claw of E. asper 

 (Miiller) is slightly smaller than the 5th claw, whereas the opposite is 

 true on Brady and Norman's specimens. The difference in size of the 

 3rd and 5th claws is so small in either case, I am inchned to believe 

 that Miiller's dramng of the furca is sUghtly inaccurate. This belief 

 is supported by study of syntypic material of Philomedes asper which 

 shows the 3rd and 5th claws to be about the same size (fig. I2g). 



Euphilomedes sordidus (MuUer, 1890) was described from females 

 collected along the coast of northern Japan. Miiller (1912, p. 2G) in 

 a key to species of Philomedes distinguished P. asper from P. sordidus 

 by the size relationship of the 3rd and 5th furcal claws: on P. sordidus 

 the 3rd and 5th claws are about the same size, whereas, on P. asper, 

 according to Muller, the 3rd claw is smaller than the 5th. This dif- 

 ference between the species disappears if the 3rd claw of E. asper is 

 not actually smaller than the 5th, as is sho^\^l to be the case in the pres- 

 ent paper. Euphilomedes sordidus was inadequately described and 

 most appendages are unknown, so that it is difficult to distinguish it 

 from E. asper on the basis of what is presently kno^Ti about the species. 

 The mde geographic separation of the two species suggests that they 

 are probably not conspecific. The Japanese form (female) has 4 

 lateral and 6 distal bristles on the 7th appendage, whereas, the Gulf of 

 Naples form (male) has 4 lateral and 4 distal bristles, but to what 

 degree this is due to sexual dimorphism is not known. The antennal 

 sinus of the female P. sordidus (Miiller, 1890, pi. 25, fig. 17) may be 

 shallower than of P. aspera (Muller, 1894, pi. 8, fig. 1). 



