126 THE NAUTILUS. 



in this instance, which was collected hy Letourneaux. It would 

 seem possible that it may be a stray specimen imported in some way 

 from some other locality. 



The species is remarkable for the unusual development of the apex, 

 which is very different from any other form species of Ferrissia known 

 to me. It is apparently very similar to that of Ancylus caliculatus 

 Bgt. It is possible that in both cases it is an individual abnormality 

 as Clessin has already suggested in regard to Bouiguignat's species. 

 Whether this is the fact can only be determined from additional ma- 

 terial, which is very desirable. But in any event, it is evidently 

 quite distinct from any of the described species from the Nile Valley. 



FERRISSIA ISSELI (Bgt). PI. VII, figs. 4-8. 



1866, Ancglus isseli Bourguignat, Moll. Nouv. Lit., p. 214, pi. 



XXXIII, figs. 13-18. 



1882, " " Clessin, Conch. Cab., Ancyliden, p. 61, pi. 4, 



fig. 9. 



The types of this species were collected by Issel at "Rambe", 

 (Ramlehjfck Pallary), near Alexandria. 



The specimens submitted by M. Pallary were collected by L'hotel- 

 lerie "on the leaves of the papyrus" at Alexandria. 



Through the courtesy of Dr. Weber, I have been enabled to defin- 

 itely determine this species, which was misapprehended by M. Pall- 

 ary in his "Catalogue de la Faune Malacologique d' Egypte". The 

 species there figured under this name is really the A. clessinianus 

 Jickeli. 



Bourguignat's description is sufficiently accurate, but his figures 

 are very inaccurate and misleading. Dr. Weber has kindly sup- 

 plied me with camera-lucida outlines of the type, which are repro- 

 duced (figs. 7-8), and in reference to them, he writes: "Vous pouvez 

 ainsi comparer ces dessins avec ceux publics par Bourguignat et voir 

 les differences, car, a notre avis, elles sont notables; pour nous, les 

 dessins de Bourguignat ne sont pas corrects; maintenant, il faut 

 ajouter qu'il existe une assez grande variation de form d'un individu 

 a 1'autre chez la meme espece". 



Apparently this species is not so abundant as the others collected 

 by L'hotellerie as only two examples were found in the material re- 

 ceived from M. Pallary. These agree very exactly with the original 

 description and the figures sent by Dr. Weber and are, undoubtedly, 

 Bourguignat's species. 



