s of Cirripedes, 2.

Farre, Dr., on the acoustic organs in Crustacea, 54.

Female organs of generation in the Lepadidae, 56.

Filaments, 38.

Forbes, Prof. E., on the homology of the peduncle, 26.

Fraena, ovigerous, 59.

Ganglia, ophthalmic, 49.

Generation, organs of, in the Lepadidae, 55.

Glands, supposed salivary, 57.
on the ovigerous lamellae, 60.

Goodsir, Mr., on the metamorphosis of Cirripedes, 9, 16.
on the supposed male of Balanus, 55.

Gray, Mr. J. E., on the genus Dosima, 99.
on the metamorphosis of Cirripedes, 9.
on the inequality of the valves in Paecilasma, 101, 103.
on an unknown 7-valved Lepas, 374.
on the genus Scalpellum, 216.

Growth, rate of, 63.

_Gymnolepas_, 137.
_Cranchii_, 146.
_Cuvierii_, 141.

Habitats, 65.

Hancock, Mr., on the burrowing of Cirripedes, 346.
on the larva of Lepas, 11.

Hectocotyle, 200.

_Heptalasmis_, 115.

Hermaphroditism, peculiar kind of, 201.

Heteroura androphora, 201.

Homologies of the Cirripedia, 25-28.

Ibla, Genus, 180.
Cumingii (female), 183.
(male), 189.
_Cuvieriana_, 203.
quadrivalvis (hermaphrodite), 203.
(complemental male), 207.
general summary on its sexual relations, 281.

Impregnation of the females and hermaphrodites in Ibla and Scalpellum,
290.

King, Captain, on a new Scalpellum, 375.

Koelliker, on the males of Cephalopoda, 200.

Labrum, general description of, 40.

Lamellae, ovigerous, 58.

Larvae, general description of, 8.

Larva of Ibla quadrivalvis, 210.

Leidy, Professor, on the eyes of Cirripedes, 2, 49.

Lepas, Genus, 67.
anatifera, 73.
anserifera, 81, 86.
australis, 89.
australis, metamorphosis of, 14.
_coriacea_, 146.
_cornuta_, 141.
_cygnea_, 92.
_dilata_, 92.
_dorsalis_, 351.
fascicularis, 92.
fascicularis, peduncle, remarkable structure of, 95.
_Gallorum_, 298.
Hillii, 77.
_leporina_, 141.
_membranacea_, 146.
_mitella_, 316.
_muricata_, 85.
_nauta_, 81.
pectinata, 85.
_pollicipes_, 298.
_scalpellum_, 222.
_sulcata_, 86.
_virgata_, 146.

Lerneidae, males of, 200.

Leucifer, 28.

_Litholepas_, 332.
_de Mont Serrat_, 351.

Lithotrya, Genus, 332.
cauta, 356.
dorsalis, 351.
Nicobarica, 354.
Rhodiopus, 363.
truncat