]^4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Euphilomedes arostratus Kornicker, 1967 



Figure 6 

 Euphilomedes arostrata Kornicker, 1967, p. 2. 



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

 Islands, Indian Ocean. 



Locality. — Gulf of Suez, Ked 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 outline formed by crescent-hke marginal denticu- 

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

 polygons 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 followed 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: First joint with medial hairs. Second joint with 

 medial hau-s and, distally, a dorsal, ventral, and lateral bristle, all 

 bristles bare or with short hau's distally. Thu-d joint with few medial 

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



