184 BTTLLETESr 181, UNITEiD SIT'ATEIS NlAITIOOSIlAiL MUSEIJM 



KEY TO THE SPECIES OF AMPHICYCLOTUS 



Shell large; greater diameter more than 50 mm goldfussi 



Shell smaller ; greater diameter less than 40 mm. 

 Shell holicoid. 



Greater diameter more than 30 mm boucardi 



Greater diameter less than 27 mm maleri 



Shell depressed-helicoid texturatus 



AMPHICYCLOTUS GOLDFUSSI (Boettger) 



1892. Aperostoma (Amphicyclotus) goldfussi Boettgee, Nachrb. deutschen malak. 



Ges., vol. 24, p. 203. 

 1897. Aniphicyclotus goldfussi Kobelt and MoLUENDOBrF, Nachrb. deutschen malak. 



Ges., vol. 29, p. 139. 

 1900. Cgclophorus (Amphicyclotus) texturatus goldfussi von Majbtens, Biologia 

 Centrali-Amerieana, Suppl., p. 598. 



Shell depressed-conic, rather thick walled, uniformly brownish 

 yellow, broadly umbilicated ; umbilicus one-fourth the greater 

 diameter of the shell. Apex rather rounded. The spire consists of 

 6 rounded whorls, which are somewhat flattened near the suture and 

 increase rather rapidly in size. They are everywhere finely wrinkled. 

 In the middle the whorls are wormlike, separated by impressed 

 grooves. The last whorl equals one-third of the diameter and is 

 compressed above, circular, and slightly decurrent anteriorly. 

 Aperture oblique, almost circular, white and shining, thin ; peristome 

 simple, sharp at the edge, connected with a heavy callus on the 

 parietal wall. The peristome is protracted into a slight auricle at 

 the posterior angle, which is furrowed ; it is somewhat projecting on 

 the right edge and thickened on the columellar side. Operculum 

 corneous, thin, consisting of closely wound whorls. Height, 28 mm.; 

 greater diameter, 51 mm. ; lesser diameter, 22 mm. 



The type was collected at San Pedro Sula, northwestern Honduras. 



We have not seen specimens of this species and have given a 

 translation of its description ; it has not been figured. 



The very large size of this species readily distinguishes it from 

 the rest. 



AMPHICYCLOTUS BOUCARDI ([Salle] Pfeiffer) 



Plate 24, Figubes 4-6 



1856. Cyclostoma (Cyclopliorus) boucardi [Snl]6] Pfeiffek, Proc. Zool. Soc. 



London, vol. 24, p. 323, pi. 35, fig. 25. 

 1858. Cyclopliorus boucardi Pfeiffeu, Monographia pneumonopomorum viven- 



tium, vol. 2, p. 65. 

 1861. Cyclopliorus boucardi Reeve, Conchologia iconica, vol. 13. sp. 26. 

 1880. Amphicyclotus boucardi Fischb:e and Cbosse, Mission scieutifique au 



Mexique et dans I'Amerique centrale, vol. 2, pt. 7, pi. 35, fig. 1. 

 1888. Amphicyclotus boucardi Fischer and Ceosse, ibid., vol. 2, pt. 7, p. 142. 

 1890. Cyclopliorus (Amplicyclotus) boucardi von Mabtens, Biologia Centrali- 



Ainericana, p. 6. 



