Spy SerrerrtONwOr A NE WesePh ClES 
OF SCAPPELLUM. FROM OPH E 
ANDAMAN SEA. 
By N. ANNANDALE, D.Sc., Superintendent, Indian Museum. 
The species of Scalpellum here described was taken by the 
R.I.M.S. ‘‘ Investigator’’ in 1906. It belongs to the subgenus 
Scalpellum, if I am right in thinking that the genus as defined by 
Darwin should be subdivided into two subgenera, namely, 
Smilium, to include the more primitive forms, which have com- 
plemental males with well-developed mouth parts, alimentary 
system and cirri, and Scalpellum, the males of which are more or 
less sack-like and degenerate. 
Scalpellum lambda, sp. nov. 
CAPITULUM narrowly and somewhat irregularly ovate (the 
carinal margin being much more strongly curved than the occlu- 
dent), laterally compressed, bearing fourteen imperfectly formed, 
thin, smooth, translucent valves, eight of which have the form of 
a Greek lambda. 
PEDUNCLE shorter than the capitulum, cylindrical; rather 
slender, expanded at the base, armed with numerous narrow 
transverse plates arranged in alternating series. 
VALVES. Carina arched, narrow ; its umbo subterminal ; its 
dorsum concave with clearly defined borders; its sides slightly 
convex outwards; its base not expanded ; its apex almost in contact 
with the carinal margin of the terga, which extends above it for 
some distance. Tergum s-shaped, with a prominent tooth on the 
carinal margin just above the point at which the apex of the carina 
approaches it; the carinal branch long and narrow, sloping gradually 
towards the carina ; occludent branch stouter and much shorter, its 
tip overlapped by the apex of the scutum. Scutwm shaped some- 
what similarly, but with the occludent branch much stouter and 
with a vertical ridge running nearer to its lateral than its occludent 
margin. Upper laius also of a somewhat similar form ; its carinal 
branch stouter and longer than its scutal one. Carinal latus, 
viewed from the side resembling the upper latus reversed, the fork 
of the \ pointing backwards and downwards instead of sloping 
upwards towards the occludent margin of the capitulum ; the two 
carinal latera viewed from behind taking the form of a pair of 
small transverse isosceles triangles, which cover the base of the 
carina and are in close contact at their bases. Inframedian latus 
