40 
PACIFIC SCIENCE, Vol. XXI, January 1967 
Fig. 30. Sclerochilus sp. B. a-c, Specimen usnm 648788; a, lateral view of right valve; b, internal view; 
muscle scar pattern poorly preserved; c, dorsal view. 
Family trachyleberididae, 
Sylvester-Bradley, 1948 
Genus Cletocythereis Swain, 1963 
Cletocythereis bradyi n. sp. 
Figs. 31 a-c 
Cy there rostromarginata Brady, 1880 [ par - 
tim]. Rept. Voyage Challenger, Zool. 1, pt. 3, 
p. 83, pi. 16, figs. 2 a—d. 
description: In lateral view: carapace sub- 
rectangular; anterior margin bluntly, evenly 
rounded, denticulate; dorsal and ventral mar- 
gins fairly straight, parallel; posterior margin 
concave in upper part, convex in lower part, 
forming point at midheight; five massive con- 
torted spines in posteroventer ; sexual dimor- 
phism conspicuous, with longer males; small 
subdued subcentral tubercle and low conspicuous 
eye tubercles present; surface with large deep 
cloverleaf-shaped, flat-bottomed reticulations, 
widening inwardly, bounded by flat-topped 
ridges; anterior rim lined with closely packed, 
small, elongate, deep reticulations; lateral sur- 
face flat. In dorsal view: carapace arrow-shaped 
due to winglike extensions of ventral ridges. 
Hinge holamphidont: right valve with heavy 
projecting anterior tooth, posteroadjacent entire 
socket, very finely crenulate groove (not illus- 
trated in Fig. 31 b) and entire faintly trilobed 
posterior tooth. Duplicature moderately wide; 
vestibules not present; continuous selvage from 
anterior tooth of right valve around venter to 
pointed posterior; muscle scars not observed. 
