132 MACROCERAMUS, HAITI. 



of brown. The suture is either weakly crenulate or not per- 

 ceptibly so. The last whorl shows a distinct but low keel, de- 

 fining the base. 



M. klatteanus is closely related to M. ludovici, agreeing with 

 that in shape and general pattern of color ; but it is a smaller 

 shell, and much more coarsely sculptured. It is apparently 

 an abundant species around Port-au-Prince, where Messrs. 

 Henderson and Simpson took it copiously, figs. 44, 45, 46 

 representing well-colored shells from Henderson's collection. 



M. nitidulus Maltz., described from Port-au-Prince (H. 

 Rolle coll.), is a synonym of M. klatteanus. It is thus de- 

 scribed : 



" Shell very narrowly rimate-perf orate, long-conic, thin, 

 rather glossy, obliquely rib-striate, the striae but slightly 

 projecting, intervals malleate; whitish, marked dimly with 

 tawny between the ribs, and regularly painted with inter- 

 rupted brown streaks. Whorls 10, a little convex, regularly 

 increasing, separated by a linear suture; the last whorl 

 slightly larger, obsoletely angular basally, and encircled with 

 an interrupted brown band below the angle. Aperture small, 

 subvertical, lunate-oval, the peristome simple, margins dis- 

 tant, the columellar margin slightly reflexed. Length 10 r 

 diam. 4.5 mm." (Maltzan.) 



13. M. UNICARINATUS (Lamarck). PL 15, figs. 12, 13. 



* ' Shell cylindric-tapering, acute-conic above ; whitish-gray ; 

 having obsolete longitudinal striae; last whorl encircled with 

 a small keel ; aperture toothless ; lip thin, the margin reflexed. 

 Length about 7 lines." (Lam.) 



Pupa unicarinata LAM., Anim. s. Vert., vi, p. 107, no. 10 

 (1819) ; edit. Deshayes, viii, p. 173 (1838). DELESSERT, Re- 

 cueil de Coq. de Lam., pi. 27, f. 4. 



Known only by Lamarck's description and Delessert's fig- 

 ures of his type specimen. In my opinion these indicate a 

 shell very similar to the Haitian M. costatus, which, indeed, 

 may prove identical; but M. microdon also resembles uni- 

 carinata somewhat. Pfeiffer's identification of Lamarck's 

 species with the Cuban M. canimarensis does not seem to me 



