1 1 8 HELIX-CARACOLUS. 



second time, solute, free from the whorl, continuous ; throat ob- 

 structed by four lamellar entering teeth, the inner smallest. Um- 

 bilicus broad or narrow, deep. Alt. 11-13, diam. 23-30 mill. 



Jamaica. 



H. anomala PFR. P. Z. S. 1848, p. 110 ; Zeitschr. f. Mai. 1848, 

 p. 119 (excl. var. ,1.) ; Monogr. iii, p. 258 ; Conchyl. Cab. p. 279, t. 

 122, f. 11-13. REEVE, Conch. Icon. f. 246. 



Section VII. CARACOLUS Montfort, 1810. 



Caracolus MONTF. Conch. Syst. ii, p. 138. ALBERS-MARTENS 

 Die Heliceen, p. 156 (1861). SEMPER, Reisen, etc., Land-mol- 

 lusken, ii Heft, p. 104 (1873). W. G. BINNEY, Ann. N. Y. Acad. 

 Sci. iii, p. 92 (1884). PFEIFFER-CLESSIN, Noment. Hel. Viv. 

 p. 177 (1878). Carocolla SCHUMACHER, Essai d'un Nouv. Syst. 

 vers test., p. 192 (1817) and of LAMARCK, CUVIER, MORCH, 

 ALBERS, BECK and others. Serpentulus " Klein ' H. AND A. 

 ADAMS, Gen. Rec. Moll, ii, p. 201. Lampadion BOLTEN (in part 

 only) Mus. p. 77. GRAY, P. Z. S. 1847, p. 173. Discodoma 

 SWAINSON, Treatise on Malacol. p. 329 (1840). 



A group of large, trochoidal, strongly-carinated species inhabiting 

 Hayti, a few of the adjacent Virgin Islands, and the extreme 

 eastern part of Cuba. The acutely carinated low-conoidal form, 

 strong, solid texture, transverse aperture with wholly toothless 

 margins, will separate the section from other members of the group. 

 The colors are usually dark and (except in H. marginella) rather 

 dull. The species are not at all well defined, and a reduction of 

 them, even greater than that made in the following pages, might be 

 accomplished when larger collections from all parts of Hayti are 

 obtained. The synonymy here given is based upon a study of 

 hundreds of examples; and no species (with the exception of one 

 mentioned in the text, If- bizonalis Desh.) has been reduced to a 

 synonym, except after the examination of numerous absolutely 

 intermediate examples uniting it with other forms. 



In the following synopsis I have attempted to give diagnostic 

 characters of each species in small compass. In doubtful cases it 

 will be necessary to refer to the detailed descriptions. 



H. carocolla L. Spire rather straightly conical ; whorls slowly 

 widening ; base quite decidedly and deeply indented around the 

 (usually) covered umbilicus ; surface usually dull, obliquely 



