atum_, 146.

Brightwell, Mr., on the Asplanchna, 292.

_Brisnaeus_, 332.
_Rhodiopus_, 363.

Brugiere, date of work of, 67.

Buoyancy, means of, in Lepas fascicularis, 95.

Burmeister, Professor, on the metamorphoses of Cirripedes, 9, 13.

Burrowing powers of, in Lithotrya, 337.

_Calentica_, 215.
_Homii_, 274.

Capitulum, general description of, 28.

_Capitulum_, Genus, 293.
_mitella_, 316.

Carapace of the larva, 15.

Caudal appendages, 43.
in larva, 19.

Cement-discs,
in a straight row, in Scalpellum vulgare, 226.
in Pollicipes polymerus, 310.

Cement-ducts, 34.
in the larva, 20.

Cement-glands, incipient in larva, 24, 34.

Cement, nature of, 36.

Cement-tissue, modified as a float in Lepas fascicularis, 95.

Chitine, chemical nature of, 30.

Chthamalinae, 2, 65.

_Cineras_, Genus, 137, 156.
_bicolor_, 146.
_Cranchii_, 146.
_chelonophilus_, 146, 151.
_megalepas_, 146.
_membranacea_, 146.
_Montagui_, 146.
_Olfersii_, 146, 152.
_Rissoanus_, 146.
_vittatus_, 146.

Circulation, 46.

Cirri, general description of, 42.
of young Cirripede, 22.

Cirripede, immature whilst within the larva, 20.

Cirripedes, sessile, affinities of, 64.
sub-families of, 2.
useful as food, 66.

_Clyptra_, 374.

Coates, Dr., on Lepas fascicularis, 96.

Conchoderma, Genus, 136.
aurita, 141.
Hunteri, 153.
_leporinum_, 141.
_virgata_, 146.

_Conchotrya_, 332.
_Valentiana_, 371.

Cuming, Mr., obligations to, 181, 189.
on the Cirripedes of the Philippine Archipelago, 65.
on Balanus psittacus, 66.

Cup, basal calcareous, in Lithotrya, 338.

Dana, Mr. J. D., on the ovaria in certain Crustacea, 26.
on the antennae of larval Cirripedes, 15, 26.

Dichelaspis, Genus, 115.
Grayii, 123.
Lowei, 128.
orthogonia, 130.
pellucida, 125.
Warwickii, 120.

Distribution, geographical, 65.

_Dosima_, 67.
_fascicularis_, 92.

Dujardin, on the larvae of Acari, 18.

Encyclopedie Method., date of, 67

Entozoons, sexes of, 201.

Epidermis of valves, 31.

Exuviation, 61, 63.
of the larval eyes, 24.
of the larval integuments, 20.
of the membrane of peduncle in Lithotrya, 336.

Eyes, in the Lepadidae, 49.
of the larva, first stage, 10.
last stage, 16, 24.

Familie