[3.] [Lepas pectinata], (magnified thrice.)

[3a.] [Lepas pectinata], var. (spirulæ), tergum, magnified thrice.

[4.] [Lepas anserifera], (nat. size.)

[5.] [Lepas australis], (nat. size.)

[5a.] [Lepas australis], carina, external view of, magnified twice.

[6.] [Lepas fascicularis], (nat. size,) with its peduncle, together with those of three other specimens, imbedded in a vesicular ball of their own formation, of which a slice has been cut off to show the internal structure. The specimen is in the College of Surgeons.

[6a.] [Lepas fascicularis], carina of, nat. size.

[6b.] [Lepas fascicularis], var. villosa.

[6c.] [Lepas fascicularis], var. villosa, carina of.

[6d.] Part of the membrane from one side of the peduncle of [Lepas fascicularis], with the ball removed, showing one of the cement-ducts, and the orifices through which the vesicular membrane forming the ball has been secreted; greatly magnified; viewed from the outside.