240 
velianum, which was found in Scalpellum Stromii, namely that new 
peduncle scales are only developed at the transition from capitulum 
to peduncle. The position of the primordial valve shows that the 
growth of the carina is all but entirely limited to the lower part 
of the plate. 
The specimen exhibits some features which are rather enigm- 
atic. In different parts, especially along the rapidly growing mar¬ 
gins of the five primary plates, the epidermis is furnished with 
scanty, large, and thick hairs, and similar, although somewhat smal¬ 
ler hairs also appear below the rostral latera. Moreover, the apex 
of the capitulum at the upper end of the occludent margin carries 
one pair of rather tentacle-like organs covered all over with short 
hairs. The last features recall the tentacular organs in young 
Scalpellum Stearnsii described by Hoek (1907), although they 
are smaller, and less numerous in the present species. We must 
admit with Hoek that nothing can be said as yet about the 
physiological function of these organs. In Scalpellum Stearnsii Hoek 
observed similar organs in the male; in Scalpellum gruvelianum 
no trace of them was found in the males. 
It is surprising that neither hairs nor tentacular organs were 
found in the smallest specimen, and I shall not venture to give any 
explanation of the case. Of course, one might think that two dif¬ 
ferent species were represented. This probability must be charact- 
erized as very remote; in the rather great assemblage of spec- 
imens gathered, no other Scalpellum species was represented, and 
the occurrence of a single, young specimen of another species 
would then be rather curious. Judging from the occurrence of other 
species, and their young stages, everything speaks against its be- 
longing to another species than Scalpellum gruvelianum . I never- 
theless wish to point out that we cannot deny the possibility, how- 
ever remote it may seem. 
Scalpellum califovnicum Pilsbry. 
Off Redondo, California; 30 fathoms. 25/IX 15. Seven specimens. 
Pilsbry (1907a) only gives few details as to the animal itself. 
The mouth feet are not very hairy. The m a n di b 1 e (Fig. 8) 
has three teeth, the second being situated at the middle of the 
cutting edge. The lower angle is rather pointed, and finely pectin- 
