14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Eiiphilomedes arostratiis Kornicker, 1967 



Figure 6 

 Eiiphilomedes arostrala Kornicker, 1967, p. 2. 



HoLOTYPE.— USNM 112658. Sex: female. Male Atoll, Maldive 

 Islands, Indian Ocean. 



Locality. — Gulf of Suez, Red Sea, Specimen probably from Sta- 

 tion 90 but could be from Station 89. Data concerning the stations 

 is given under "Type-locality" of E. polae. This specimen was in 

 vial containing specimens identified as Philomedes polae by Dr. 

 Herbert Graf. 



Description of male. — Shell (figs. 6a-e,h): oval, elongate with 

 greatest height near middle, prominent rostrum and antennal sinus 

 (figs. 6a, b, e); anterior margin of rostrum and anteroventral margin of 

 shell with scalloped outHne formed by crescent-like marginal denticu- 

 lations. Surface of valves with distinct irregular polygons (fig. 6^); 

 polj^gons with pebbly texture appearing as minute polygons under 

 high magnification. Posterior dorsal margin with linear hinge de- 

 pressed below outline of shell; posterior hinge element of each valve 

 consisting of angular sclerotized process; medial hinge element 

 straight; anterior hinge element not prominent. Left valve broadly 

 overlapping right valve along anterodorsal margin. Numerous 

 adductor muscle scars (partly obscured by muscles in specimen exam- 

 ined) clustered behind and below middle of valve; 2 small scars and 

 large oval hyaline spot situated some distance above other; additional 

 scars below anterior hinge element (fig. 6A). Inner lamella broad with 

 vestibule; selvage with wide, corrugated lamellar prolongation having 

 fringe of slender spines along outer margin. Eleven long hairs with 

 a few secondary spines forming row on inner lamella behind rostrum 

 (fig. 66) ; inner lamella below rostrum with small hair foUowed by wide 

 space and then 20 hairs on right valve and 21 on left valve (figs. 6c, d); 

 about 34 hairs on posteroventral part of inner lamella. Hair with 

 either pointed or blunt ends distributed on rostral surface, some form- 

 ing row near margin of shell; slender hairs with pointed ends on 

 posterior surface of shell, some forming row near posterior margin; a 

 long tapered hair projecting from base immediately behind posterior 

 hinge element of each valve. 



Dimensions: Greatest length 1.23 mm, greatest height 0.73 mm. 

 Specimen is larger than male reported by Kornicker (1967) from 

 the Maldives, length 1.00 mm, height 0.60 mm. 



First antenna: Fu-st joint with medial hairs. Second joint with 

 medial hairs and, distall}^, a dorsal, ventral, and lateral bristle, all 

 bristles bare or with short hau-s distally. Third joint with few medial 

 hairs and 1 ventral and 2 dorsal bristles, all with short hairs, the 



