235 
b. 
This fine little species was first 
described by Hoek (1883) as Scal- 
pellum acutum, later by G r u v e 1 (1900) 
as Scalpellum longiroslrum. Hoek’s 
figure is not quite characteristic be- 
cause the subcarina is almost invisible, 
owing to, the somewhat oblique pro- 
jection; it was his figure which led 
Gru vel to consider his specimens as 
representatives of another species; also 
his drawing is somewhat aberrant in 
the contours of the rostral latus and 
the subcarina, in comparison with my 
specimens, and I, therefore, here give 
a camera drawing of the specimen from Menado Bay (Fig. 5); it 
evidently agrees the best with Hoek’s type. 
c. 
Fig. 5. Smilium acutum from the 
Menado Bay. a. lateral, b. rostral 
c. carinal view. [X 5,3], 
Genus Scalpellum. 
In the treatment of this difficult genus, Pilsbry (1907) has 
drawn up new lines, which seem to be of great value. The old 
classificatory lines drawn up by Hoek, and followed by Gru vel 
show their inadequacy, nearly related species often being separated 
and put in distant groups only on behalf of the presence or ab¬ 
sence of a rudimentary, often almost invisible rostrum. Rudiment- 
ary plates, which always greatly vary in shape and development, 
cannot serve as a basis for greater systematic groups. — Indeed, 
a total revision of the genus is necessary; but first of all the de¬ 
velopment of the species has to be elucidated; probably many of 
the species have been described from young specimens and ulti- 
mately will turn out to be synonyms. 
Scalpellum Steavnsii Pilsbry. 
15 miles W. J / 2 S. of Jolo, 250 fathoms. 27/III 14. Four specimens. 
Sagami Bay, 80 — 120 fathoms. 6—19/VI 14. One specimen. 
Sagami Bay, 400 fathoms. 2 VII 14. One specimen. 
32° 17’ N., 128° 11’ E., 110 fathoms. „Hyaton Maru“ 14 V 14. One 
specimen. 
