GENUS — POLLICIPES. 293 



in the ordinary Cirripedial method, attached to two diffe- 

 rent parts of the capitulum, in both cases being pro- 

 tected by the closing of the scuta. As I am summing up 

 the singularity of the phenomena here presented, I will 

 allude to the marvellous assemblage of beings seen by 

 me within the sack of an Ibla quadrwalvis, — namely, an 

 old and young male, both minute, worm- like, destitute of 

 a capitulum, with a great mouth, and rudimentary thorax 

 and limbs, attached to each other and to the hermaphro- 

 dite, which latter is utterly different in appearance and 

 structure ; secondly, the four or five, free, boat-shaped 

 larvae, with their curious prehensile antennas, two great 

 compound eyes, no mouth, and six natatory legs ; and 

 lastly, several hundreds of the larvae in their first stage of 

 development, globular, with horn-shaped projections on 

 their carapaces, minute single eyes, fihformed antennae, 

 probosciformed mouths, and only three pair of natatory 

 legs; what diverse beings, with scarcely anything in 

 common, and yet all belonging to the same species ! 



Genus — Pollicipes. PL VII. 



Pollicies. Leach. Journal de Physique, torn, lxxxv, Julius, 



1817* 

 Lepas. Linn. Systema Naturae, 1767. 

 Anatifa. Brugiere. Eucyclop. Method, (des Vers), 1789. 

 Mitella. Oken. Lehrbuch der Naturgeschi elite, 1815. 

 Ramphldiona. Schumacher. Essai d'un Nouveau Syst. &c., 1817 



(ante Julium). 

 Polylepas. Be Blainville. Diet, des Sc. Nat., 1824. 

 Capitulum (secundum Klein). /. E. Gray. Anuals of Philos., 



torn, x, new series, Aug. 1825. 



* This is one of the rare cases in which, after much deliberation, and with 

 the advice of several distinguished naturalists, I have departed from the 

 Rules of the British Association ; for it will be seen that Mitella of Oken, 

 and Raii/phidioua of Schumacher, are both prior to Pollicipes of Leach ; yet, 



