Occasional Papers of the Museum of Zoology 37 



ClSTUL0PSrN'AE34 



Cistulops raveni raveni (Crosse) 



Cistula raveni Crosse (1872; J. de C, XX, 159); Crosse and Bland 

 (1873; J. de C, XXI, fig. 1-5). CJiondropoma (s. s.) raveni Henderson 

 and Bartsch (1920; P. U. S. Nat. Museum, LVIII, 62). 



Type locality: "Curasao"; probably the Sehaarlo (C5c), 

 back of Willemstad ; collected by Raven. 



Distribution of species: Curacao; north of Seroe Salinja 

 Abau and Ronde Klip; Aruba, south of Rooi Frances. 764 

 specimens collected. 



Distribution of subspecies: Curasao; Seroe Salinja Abau 

 and Ronde Klip, north of Plaja Abau (C5, 6, 11, 12, 15, 17, 

 20). Rare to quite common; buried rather deeply under rocks 

 and in crevices in talus, on the more humid, wooded portions 

 of the limestone mesas and escarpments. A purely terrestrial 

 species. 343 specimens collected. 



Shell : small, slender obovate, thin. Color : cream to brown- 

 ish, with 7 or 8, chocolate-colored spiral bands, usually broken 

 into rows of flammulations except on the last 14 whorl. 

 Whorls : 7 and 8I/2 in two complete males ; about 414 

 retained ; not markedly convex, and with quite shallow sutures, 

 at least on the middle whorls; last i/o whorl markedly de- 

 scends, decreases in diameter and is solute and angulate above. 

 Last whorl : growth sculpture of microscopic, undulating, in- 

 complete and anastomosing wrinkles, and high, compressed, 

 widely-spaced riblets, which are crested at the upper angle 

 or form prominent buttresses at the suture ; riblets much more 

 closely spaced near peristome; spiral sculpture of numerous 

 (15-18 counted), low, rounded cords, which are higher and 

 more prominent in the umbilical region, where the growth 

 riblets form cusp-like crests over them. Earlier whorls: 

 similar, but spiral sculpture less prominent, and microscopic 

 growth-wrinkles slightly more regular. Embryonic whorls :^^ 

 13/4 ; practically smooth, but very slightly and irregularly 



34 See 1924 ; Naut., XXXVII, 89-92. 



35 1923; Occ. Papers Mus. Zool. Univ. Mich., no. 1.37, fig. 1-6. 



