236 
The specimens show the following dimensions in mm: 
I II III IV V VI VII 
Capitulum, length. 45 45 44 38 22 20 18 
Peduncle, length 80 69 50 80 9 13 15 
The specimens vary much in their external features, and com- 
pletely bridge the small gap between the typical form described 
by Pilsbry (1890), and later by Hoeck (1907) from Sagami, 
and the var. robusta Hoek (1907) from the „Siboga“ expedition. 
There is, indeed, no reason whatever to keep these variants as 
separate „varieties“. 
a. 
Fig, 6. Scalpellum Stearnsii. a.-d. apical projections of the carina a specimen from 
Sagami, b.—d. specimens from .Tolo, e. small specimen from 15 miles W. S. of Jolo. 
[a.—d. nat. size, e. X 6,7]. 
The hornlike projection of the carinal latus exhibits great vari¬ 
ation (Fig. 6 a.—d.); it can be almost wanting, or it is strongly 
developed as in one of the Sagami-specimens (nr. III). A parallel 
variation is shown in Hoek’s figure of his var .genuina (1907, 
pi. VI, fig. 4). 
In Scalpellum Stearnsii the varying extent of the calcification 
of the valves throws a glaring light on the value of this character 
as a base for systematic subdivision of the genus. Also Pilsbry 
(1907) has pointed to the invalidity of the character although he 
maintains it on behalf of convenience. It would not be surprising 
indeed if it were to be demonstrated that several of the imper- 
fectly calcified species of Scalpellum in reality are variants of spec¬ 
ies which are normally perfectly calcified. It is in this connection inter- 
esting to notice that in Scalpellum Stearnsii as in Scalpellum larvale 
(comp. Pilsbry 1907, p. 194, pi. VI, figs. 2—6) — a species with 
