Prof. A. Mousson on the Molluscan Fauna of the Canaries. 89 



(5.) The genus Pupa in the Madeiras developes itself richly 

 in about twenty very peculiar forms, of which one only, P. anco- 

 nostoma, can be identified with a European species. From the 

 Canaries M. D^Orbigny obtained only two species, viz. P. de- 

 albata, Webb, belonging to a foreign southern type, and P. ma- 

 culosa, Lam., of very doubtful habitat. Herr Blauner has added 

 three small forms, one of which, P. atomics, Shutt., comes near 

 the European P. minutissima, whilst both the others [tceniata and 

 castanea, Shutt.) approach nearest the Madeiran cheilogona and 

 irrigua, Lowe. 



It is interesting to find represented also now in the Canaries, 

 through Herr Blauner's admirable discoveries, and still by single 

 species, three types which were regarded hitherto as quite pecu- 

 liar to the Madeiras, viz. : — 



(1.) The group of H. bifrons, Lowe, to which H. Pompylia, 

 Shutt., is to be referred. 



(2.) The remarkable type of the thin-shelled, carinated H. 

 Webbiana, Lowe, to which H. cuticula, Shutt., belongs. 



(3.) Lastly, the extraordinary group of Cyclostoma — Craspedo- 

 porna, which in Madeira furnishes both the species C. lucidum 

 and Lyonnetianum, Lowe, and now in TenerifFe is represented by 

 C. costatmn, Shutt. 



Li the Canaries, wholly different types from these predomi- 

 nate, of which the following are the principal: — 



(1.) The type H. sarcostoma, Webb, including malleata^ and 

 consobrina, Fer. It stands perhaps in nearest alliance with the 

 S. European H. vermiculata, M., which, strangely in contra- 

 distinction to H. lactea, M., not being found itself either in 

 Madeira or in the Canaries, is not even represented in the 

 latter t (?) by any allied form. 



(2.) In like manner, the Madeiran group is entirely wanting in 

 the type plicaria, Lam. J, which yields in the Canaries six species. 



(3.) Quite peculiar to the Canaries, and varying in a series of 

 species through many shades from globose to carinate, is the 

 group of monilifera and tumulorum, Webb. In Madeira, as 

 also really in the Mediterranean, it is wholly wanting §, at least 

 in any clearly expressed form. 



* H. malleata, Fer. (= H. bidentalis, Lam.) cannot rightly be included 

 with H. sarcostoma, Webb, and consobrina ^ Fer. — Tr. 



t Rather, surely, "the former," i. e. Madeira, in which H. lactea, Miill., 

 does not occur, whilst it abounds in several of " the latter," or Canaries, 

 representing in them the S. European H. vermiculata, Miill. — Tr. 



X H. plicaria, Lam., is merely an abnormal state, scarcely a variety, of 

 H. Adansoni, Webb {H. Pouchet, Fer.), which can scarcely, withoutvio- 

 lence, be placed in a different group from that of H. consobrina and sarco- 

 stoma. — Tr. 



§ The exclusively Porto-Santan (erroneously supposed TeneriiFan or 



