GENUS ALCIPPE. 529 



having characters confined to the males of the other genera. 

 Perhaps I have been in some degree influenced by the 

 difficulty of finding external characters by which to separate 

 Alcippe as a family from the other Lepadidse. 



But we shall presently find, when we come to Crypto- 

 phialus, that all the above difficulties, great as they are, 

 are greatly enhanced, for Cryptophialus is certainly allied 

 in a very direct and curious manner (in decided opposition 

 to the remarks just made on special affinities) to Alcippe, 

 and yet in all the more important parts of its organisation, 

 and in its metamorphosis, it differs so fundamentally, that 

 I have felt myself obliged to form not merely a Family, 

 but a distinct Order for its reception. 



Genus — Alcippe. PL 22, 23. 



Alcippe. Hancock. Annals and Mag. of Nat. Hist., vol. 4, 1849, PI. S, 9. 



Fern. — Capitulum without valves, with the orifice spi- 

 nose : peduncle with the basal end added to during growth; its 

 rostral surface depressed and covered by a horny disc : capi- 

 tulum and peduncle imbedded in a cavity excavated in the 

 shells of molluscs. 



Labrum very large, with a roio of long hairs on each side: 



palpi rudimentary : mandible one-toothed : second, third, and 



fourth cirri absent: fifth and sixth cirri with the posterior 



ramus represented by a button-like body : caudal appendages 



four-jointed, muscular : anus none. 



Males, — several, adhering to the uptper end of the horny 

 disc of the female : capitulum naked, transparent, elongated, 

 with a small orifice at the end : peduncle lobed, with the lower 

 end extending far beyond the pupal antenna : eye, testis, and 

 vesicula seminalis single; probosciformed penis very long : 

 mouth, stomach, thorax, abdomen, and cirri none. 



meme famille, qui lui appartiennent sans la representer; comment le type, s'y 

 presente comme efface, ne conservaut plus pour se laisser reconnaitre que 

 quelque trait isole, mais caracteristique, dont la valeur, essentiellement 

 ordinale, pent etre ainsi constatee." Under the point of view, so strongly and 

 admirably insisted on lately by Milne Edwards ('Annales des Sciences Nat./ 

 3d series, torn. 17), of describing types without regarding whether the different 

 members blend together ou their confines, psrhaps Alcippe should be raised to 

 the rank of a Family : I feel quite unable to decide how properly to act. 



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