THE SUBGENUS CYLINDER. 85 



(Sowb.), and others like C. nocturnus and Bandanus 

 in other sections, to which I provisionally give the 

 name marmoricolor. Another specimen^ again, re- 

 sembles C. magus, a variable Eastern species, here 

 called magdides. A detailed description of this 

 species seems impossible. 

 C. pennaceus (Born.) is a variety. 

 C. ruhiginosus (Hwass) is likewise a variety, but both 

 are more constant than some of the forms of the 

 type. 



C. Madagascariensis (Sowb.). Though placed by Tryon 

 as a variety of C. archiepiscopus, it is far removed 

 from that species, and really approaches C. omaria. 

 It is a small, neatly marked, very finely reticulated 

 species, native, as its name implies, of Madagascar. 



C. aulicus (L.). The largest and boldest-marked species 

 of the genus, attaining sometimes a length of 

 nearly 6 inches. It is distinguished by its form 

 and revolving striae, and cannot be mistaken for any 

 species but the next. 



C. auratus (Lam.). Merged into C. aulicus by Tryon, 

 with which I can hardly agree ; the curious zigzag 

 effect of the alternations of warm chestnut-brown 

 coloration and small articulations well represented 

 in the specimen here exhibited, as well as in the 

 plate in Reeve, Conch. Icon., sufficiently serve to 

 distinguish it. 



V. AUREI. 



Shells subcylindrical, merging into the next subgenus 

 Hermes, ribbed transversely; spire elevated, very obtuse, 

 convex. 



C. aureus (Hwass). A distinct species, though similar in 

 its markings to C. Pauluccice and some others. 



