LEPAS ANATIFERA. 73 



1. Lepas anatifera. Tab. I. fig. 1. (var.) 



L. anatifera. Idnnaus. Systema Naturae, 1767. 



Anatifa vel anatifera vel pentalasmis leevis*, plerumque 

 auctorum. 



— engonata (!). f Conrad. Journal Acad. Nat. Sc. Phila- 



delphia, vol. vii, 1837, p. 262, PL xx, fig. 15. 



— dentata (var.) Brugiere. Eucyclop. Meth. (des Vers), 



1789. 

 Pentalasmis dentatus (var.) Brown. Illust. Conch., PI. lii, fig. 5. 

 Anatifa Martin St. Ange. Mem. sur l'organisation 



des Cirripedes, 1835. 



L. valvis aid Icevibus aut delicate striatis : e duobus 

 scutis, dextro solum dente interno umbonali instructo; 

 pedunculi parte superior e fused. 



Valves smooth, or delicately striated. Right-hand 

 scutum alone furnished with an internal umbonal tooth : 

 uppermost part of peduncle dark-coloured. 



Filaments, two on each side. 



Var. (a). Fig. 1. Scuta and terga with one or more 

 diagonal lines of dark greenish-brown, square, slightly 

 depressed marks. 



Var. (b). (Fig. lb.) Carina strongly barbed. 



Extremely common ; attached to floating timber, vessels, seaweed, bottles, 

 &c, and to each other, in the Atlantic Ocean, Mediterranean, West Indies, 

 Indian Ocean, Philippine Archipelago, Sandwich Islands, Bass's Straits, 

 Van Diemen's Land. 



General Appearance. — Valves white, more or less 

 translucent and thick, with a tinge of blueish-grey, from 

 the underlying corium ; sometimes brownish cream- 

 coloured, rarely with a tint of purple. Surfaces smooth, 



* As this, though the commonest species, has never been defined, I give 

 only a few synonyms and references, it being quite impossible to distinguish, 

 in any published description, this species from A. Hillii of Leach; this 

 latter species I recognise under this name only from having authentic spe- 

 cimens from the British. Museum, as Leach overlooked every one of the real 

 diagnostic characters. 



f I have used, in conformity with botanists, the mark of interjection, to 

 show that I have seen an authentic specimen. 



