382 Bulletin de la Société Royale Entomologique d'Egypte 
ment of numerous small scales in a semi-lunar patch, 
each scale with about nine or ten terminal spines. 
Siphon 1.4 mm. long, and 6 - 6,4 times as long 
as broad at the base, uniformly tapering, the valve 
bristles strong, curved. Pecten with 10 - i 3 teeth, the 
last four or five more widely spaced, extending nearly 
one-third the length of the siphon. Each tooth long, 
sharply pointed, with four or five denticles, the basal 
ones short. Siphonal tufts long, averaging one-third 
or more the length of the siphon, about ten or eleven 
in number, in two irregular ventral rows, the basal 
tuft about on a level with the last tooth but two of 
the pecten, and the row extending almost to the apex 
of the siphon, the apical tuft usually somewhat de¬ 
tached. In addition there are two or three pairs of 
minute lateral tufts of two or three hairs each, one or 
two near the middle, and one near the tip of the 
siphon. 
Anal segment somewhat longer than broad, and 
distinctly broader at the apex than at the base. Dorsal 
tuft of five or six hairs — one or two of which are 
very weak — and one long strong hair on each side. 
Ventral brush long and abundant, of about fourteen 
tufts. Gills all almost equal, about as long as the 
breadth of the saddle. 
Larvae of this species were found in a single 
rock basin in the Wadi No’oth, North Gelala Moun¬ 
tains, at an altitude of 35 o metres, in April, 1924; in 
company with C. pluvialis and T. longiareolata. Se¬ 
veral other pools and rock basins near by contained 
only the two latter species. Mr. F. W. Edwards has 
informed me that he has received specimens of this 
