4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Paralectotype. — 1 male designated as specimen C, Naturhisto- 



risches Museum. 



Additional specimens.— 2 females from the type-locality desig- 

 nated as specimens 1 and 2 on slides, Naturhistorisches Museum. 



Type-locality.— Graf (1931) reported 4 specimens of Philomedes 

 polae from Pola Expedition Station 90 and 1 specimen from Station 89; 

 both stations are in the Gulf of Suez; all specimens are males. The 

 vial containing specimens of P. polae did not bear a station number; 

 however, as 3 specimens were in the vial, it is probable that all, and 

 at least 2 of them, are from Station 90 rather than 89. Station 90, 

 therefore, is considered here to be the type-locality; since Stations 89 

 and 90 are close to each other, however, whether the lectotype was 

 collected at one or the other is not of major significance. Females of 

 P. polae, designated by Graf as Philomedes species, were collected at 

 Station 90. Data concerning the stations are as follows: 



station latitude lonijitiide collecting depth date collected 



89 28°40'N 32°57'E surface March 31, 1896 



90 28°00'N 33°36'E surface April 1, 1896 



Description of male.— Shell (figs. 1, 2a-e): oval, elongate with 

 greatest height near middle, prominent rostrum and shallow rostral 

 incisure (fig. la); anterior margin of rostrum and anteroventral 

 margin of shell with scalloped outUne formed by cresent-like marginal 

 denticulations; alate shield projecting laterally and anteroventrally 

 from behind rostral incisure, partly covermg incism-e, flap strongly 

 sclerotized anteriorly (figs. Ic,/). Sm-face of valves with kregular 

 polygons; polygons with pebbly texture appearing as minute polygons 

 under high magnification (figs. U,k). Posterior dorsal margin with 

 linear hinge depressed below outline of shell (figs. 26,c); hinge not 

 visible in lateral view except by transmitted fight. Posterior hinge 

 element of each valve consisting of angular sclerotized process (figs. 

 2c,d); medial hinge element straight; anterior hinge element not 

 prominent. Left valve broadly overlapping right valve along antero- 

 dorsal margin. About 20 individual muscle scars (partly obscured 

 by muscles in specimen examined) clustered behind and below middle 

 of valve; small scar and large oval hyaline spot situated some distance 

 above others; 2 large and 4 smaller scars situated below anterior hinge 

 element (figs. la,i,j). Inner lamella broad with vestibule; no parallel 

 striations or line of concrescence observed on inner lamella. Selvage 

 with wide, corrugated, lamefiar prolongation having fringe of slender 

 spines along outer margin. SLx long haks bearing secondary spines, 

 forming row on inner lameUa behind rostrum (figs. lg,h); inner lamella 

 ventral to rostral incisure with small plumose hair, followed by wide 

 space and then about 5 plumose hau's (fig. 2a); about 30 haii's on 

 postero ventral part of inner lamella (figs. 2d,e). 



