24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Euphilomedes species 



Figures lle-j 



Material. — Vial from British Museum collection containing 

 separated left and right valves and several pieces of the soft parts 

 of an ostracod, and also a label with the number 50002. The vial 

 with the ostracod was in a larger vial with the label "Pseudophilo- 

 medes Joveolata Naples — Shallow water — April 1887, formerly a slide 

 dissected. Norman coll. 1900. 3. 6. 451." All appendages were 

 present in the vial except the caudal furca. 



Discussion. — Because of the missing furca and poor condition of 

 the valves, a complete description of the species was not attempted. 

 A few appendages have been illustrated to show that the specimen 

 could not belong to the genus Pseudophilomedes and is a female 

 Euphilomedes. 



No explanation is available for Brady and Norman's statement 

 (1896, p. 660) that only males of Philomedes foveolatus (Miiller) 

 were collected. In order to disturb the specimen as little as possible, 

 most illustrations were made from the original partly dissected speci- 

 men without benefit of cover glass. 



Description (incomplete female) . — Shell (fig. lie): Oval, elongate, 

 prominent rostrum, and broad rostral incisure; surface with oval 

 pits. Endopodite of second antenna with 2 joints (fig. 11/): 1st 

 joint with 1 long and 5 short bristles; 2nd joint elongate with long 

 hirsute bristle near middle and distal bristle (distal bristle represented 

 by stump on specimen examined) . Exopodite of 2nd antenna (figs. 1 1/, 

 g) with 9 joints: 1st joint elongate, joints 2-9 trapezoidal, each joint 

 smaller than preceding joint; joints 2-8 with row of short hairs along 

 media-distal margin; bristles on joints 2-5 with marginal spines and 

 without natatory hairs; bristles on joints 6-8 with natatory hairs 

 and without marginal spines; joint 9 with 4 stout bristles and 1 slender 

 bristle, all with natatory hairs, and 2 subequal short spinous bristles 

 (fig. llg). Maxilla with 3 endites typical of genus. Fifth limb with 

 large quadrate 2nd joint typical of genus. Sixth limb (fig. llh) 

 with 4 endites and end joint projecting posteriorly. Seventh limb 

 (fig. Hi) with 6 lateral and 6 distal bristles; terminal row of teeth 

 with 2 opposing pegs. Frontal organ 2-jointed (fig. llj): 1st joint 

 elongate; 2nd joint tapering from broad base to slender tip. 



Shell dimensions: Maximum length 1.42 mm, maximum height 

 0.88 mm. 



The structure of the endopodite of the 2nd antenna, the maxilla, 

 and the 5th and 6th limbs clearly shows that this species does not 

 belong in Pseudophilomedes. Without having the furca available, 

 it is not possible to be absolutely certain that the species does not 



