ko 
CRUSTACEA. 639 
this crustacean ; from this ridiculous popular fancy the specific name goose- 
mussel is derived. 
Pollicipes Luacu (and Scalpellum ejusd.), Polylepas Buaty. 
Peduncle rough, squamose. Shell compressed at the sides, with 
valves subcontinuous, unequal, thirteen or more. 
Sp. Pollicipes scalpellum Lam., Lepas scalpellum L., Guten Iconogr. 1. 1. 
fig. 4 ;—Pollic. mitella, Lepas mitella L., Rumen. Amb. Rariteitkarn. Tab. 
47, fig. M, GUERIN 1. 1. fig. 3, &c. 
Gymnolepas BLAINV. Conchoderma OtreRS. Mantle naked, 
without valves, or with rudiments of valves, remote from each other. 
Cineras Luacu, Lam. Calcareous pieces five distinct, joined by 
membrane, small, with one dorsal, two above the aperture of mantle, 
two others below that aperture. 
Sp. Cineras vittata Luacu, Lepas coriacea Pour Testac. 1. Tab. vi. fig. 20, 
GUERIN Jconogr. 1. 1. fig. 5 ; in the Mediterranean sea, 
Otion Luacu. ‘Two lunated valves at the margin of the aperture 
towards the peduncle. Body with two tubular ear-like appendages 
pervious at the apex. 
Sp. Otton Curierii, Lepas aurita L., Pow 1. 1. fig. 21, Guérin Iconogr. 1. 1. 
fig. 6. 
Alepas Rane. Mantle without any calcareous pieces, subpellucid, 
continuous with peduncle. 
Sp. Alepas fasciculata Lesson, Anatife jawne sans coquille MartIN Satnt- 
AnGE Mém. sur les Cirripedes, Tab. 1. GuERIN Iconogr. 1. 1. fig. 8, Alepas 
squalicola Lovin, éfversigt of konigl. vet. Akad. Férhardlingar. 1844, 
Pp- 192, 193, Tab, 11. (in this species, that lives parasitically on sharks, 
the feet also are soft, and without bristles). 
Note.—On the fossil species, which are chiefly found in chalk strata, of 
Anatifa and Pollicipes comp. StEENSTRUP in KronyeEr’s Tidskrift 1. 1837, 
pp. 358—366, 1. 1839, pp. 396—415, and on the fossil Lepadide of Great 
Britain, C, DarRwin’s Monograph, 1851, printed for the Palzontographical 
Society. 
[From the investigations of Darwmy, recorded in his two admir- 
able memoirs so often cited, we learn that his subclass of Cir- 
ripeds contains forms that differ greatly from those of the Bala- 
noidea and Lepadicea and are much less perfect in their organisation. 
He divides the Cirripeds into three orders—the Thoracica, Abdomi- 
nalia, and Apodes, the limbs or cirri being thoracic in the first, 
abdominal in the second, and entirely absent in the third. In the 
