er considerably.

To put the case as I have before done, if a specimen of one of these
parasites had been brought to me to class without any information of its
habits,--the downward direction of growth in all the valves, the
presence of a rostrum, the villose outer integument, all the details of
the prehensile antennae, the form of the animal's body, and the position
of the labrum, would have convinced me that, though a quite new genus,
it ought to have stood close to Scalpellum, and nearer to it than to
Ibla.

6. SCALPELLUM VILLOSUM. Pl. VI, fig. 8.

POLLICIPES VILLOSUS on Plate (TOMENTOSUS in text). _Leach._
Encyclop. Brit., Suppl., vol. iii, 1824, Pl. lvii.

---- VILLOSUS.[59] _G. B. Sowerby._ Genera of Shells, Pollicipes,
fig. 3, 1826.

CALANTICA HOMII. _J. E. Gray._ Annals of Phil., vol. x, p. 100,
1825.

[59] As Mr. Sowerby has adopted the name _villosus_, I have
followed him; though as _tomentosus_ is used through some mistake
by Leach in the text, both names have equal claims as far as
priority is concerned.

In Lamarck, 'Animaux Sans. Vert.,' the _P. villosus_ of Sowerby
is made synonymous with _Anatifa villosa_ of Brugiere, which is
certainly incorrect, although the _A. villosa_ of this latter
author is not positively known.

_S. (Herm.) valvis 14: sub-rostro praesente: carina paene recta: laterum
paribus tribus; pari superiore triangulo._

(Herm.) Capitulum with 14 valves: sub-rostrum present: carina nearly
straight: three pair of latera; upper latera triangular.

_Mandibles_ with four teeth, of which the second is the smallest:
maxillae with a projection near the inferior angle: no caudal appendage.

COMPLEMENTAL MALE, attached externally between the scuta, below the
adductor muscle; pedunculated; capitulum formed of six valves, with the
carina not descending much below the basal angles of the terga: mouth
and cirri prehensile.

Eastern Seas[60] (?) attached to shells and rocks. Mus. Brit.;
College of Surgeons; Cuming.

[60] No habitat is attached to any of these specimens; but Mr.
Sowerby informs me that he has seen specimens attached to the
_Modiola albicostata_ of Lamarck, which shell is said by the
latter author to be found in the seas of India, Timor, and New
Holland.

HERMAPHRODITE.

_Capitulum_ with fourteen valves, consisting of a pair of scuta and of
terga, a carina, (which five valves are much larg