Scan Cf du 21 Décembre 192î 
387 
fringe of minute spines. The scales in the upper part 
of the patcli short, the lower ones long and pointed. 
Siphon very slightly curved, about i.a 5 mm. 
long and about 6.6 times as long as broad at the base; 
the basal half tapering to about half the width at the 
base, the apical half with the sides almost parallel. 
Pecten extending along about the basal two-fifths of 
the siphon; with i/j or io teeth, the basal five of which 
are very small, and the last three or four rather more 
widely separated : each tooth long, pointed, slightly 
curved, with eight to ten small basal denticles. 
Three pairs of siphonal tufts, the first pair si¬ 
tuated at the middle of the siphon, subventral, of three 
hairs each, rather longer than the breadth of the si¬ 
phon. The second and third pairs rather shorter, sub¬ 
lateral, of two or three hairs each. 
Anal segment long, the saddle nearly half as long 
again as wide. Dorsal tuft on each side of one very 
long hair plus a long and two shorter hairs. Ventral 
brush rattier sparse, with about nine tufts, the hairs 
short. 
Anal gills about three-quarters the length of the 
saddle, pointed, the dorsal pair longer than the ven¬ 
tral. 
At present only recorded from the Peninsular of 
Sinai : Kossaima, El Moweilleh, Ain Kadeis, and Ain 
Gedeirat, all near the Eastern frontier of Sinai some 
60 miles South-east of El Arish, in August and Sep¬ 
tember, 1924; and from Ain Musa, South-east of Suez, 
in September. At Kossaima the larvae were common 
in swiftly flowing water in a small drain, but they 
are also found in stagnant pools. 
