156 GENUS ALEPAS. 



had a name not been already attached to it, I should not 

 have given one. In the monstrous variety described, we 

 see to what an extent the valves may vary. The C. Hunteri 

 approaches nearest to the var. of C. virgata, called by 

 Leach Cineras cJielonophilus, for in both, the top of the capi- 

 tulum is bluntly pointed and the terga are solid within ; 

 in the Var. c/ielonop/iilus, the terga and carina are minute, 

 whereas here, though very narrow, they are much elon- 

 gated. Certainly C. chelonophilus has almost as strong 

 a claim to rank as a species as C. Hunteri ; but in the 

 former, by the aid of other varieties, the differences were 

 almost reduced to the peculiarities in the terga — the 

 valves, the most subject to variation. In C. Hunteri we 

 have other differences, and the form of the terga is even still 

 more peculiar. I have, therefore, provisionally attached 

 to it the specific name by which it is designated in the 

 Museum of the College of Surgeons. From having been 

 long kept in spirits, all aid from colour is lost. 



Genus — Alepas. PL III. 



Alepas. Sander Rang. Manuel des Mollusques, 1829. 



Anatifa. Quoy et Gaimard. Voyage de 1' Astrolabe, 1831. 



Triton. Lesson. Voyage de la Coquille, 1830. 



Cineras. Lesson. Secundum Sander Rang. 



Capitulum aut sine valvis, aut scutis corneis, pane 

 abditis. 



Capitulum without valves, * or with horny, almost 

 hidden, scuta. 



Filaments seated beneath the basal articulations of the 

 first pair of cirri ; mandibles, with two or three teeth ; 



* Any one not attending to the characters derived from the softer parts of 

 the Balanidae and Lepadidse, might easily confound with Alepas the genus 

 Siphonicella (genus nov.), which, undoubtedly, though having the external 

 appearance of a pedunculated cirripede, belongs to the Balanina3, and is closely 

 related to Coronula. 



