THE CYCLOPHORID LAND MOLLUSKS OF AMEKIOA 171 



Two additional lots in the collection of the National Museum come 

 from Cordova : one from Antigua ; one from Orizaba. Six lots are 

 labeled merely "Mexico," without specific locality. 



There is considerable variation in the size of this species. The small- 

 est specimen, U.S.N.M. No. 331900, has 6 whorls and measures : Height, 

 14 mm. ; greater diameter, 21.3 mm. ; lesser diameter, 15.7 mm. This 

 is said to have been collected by Cuming; we have no locality label 

 with it beyond that of Mexico. 



The deep notch and lesser size easily distinguish this species from 

 C. avus. 



CYRTOTOMA IGNOTUM, new species 



Plate 22, Figures 16-18 



Shell helicoid, with rather elevated spire, covered with a pale straw- 

 colored periostracum. Interior of peristome bluish white. Nuclear 

 whorls 1.5, small, well rounded, smooth. Postnuclear whorls some- 

 what inflated, strongly rounded and marked by retractively slanting, 

 hairlike axial riblets. The spaces separating these are two or three 

 times as wide as the riblets. Suture deeply impressed by a feeble spiral 

 thread on the summit of the whorl. Periphery well rounded. Base 

 somewhat inflated, strongly rounded, marked by the continuation of 

 the axial ribs, which pass over the umbilical wall, where they become a 

 little stronger. Umbilicus broad, open. Aperture broadly oval, the 

 long axis being between the notch and the junction of the basal and 

 outer lip ; peristome expanded and reflected, forming a slight auricle 

 at the posterior angle. The callus on the parietal wall bears a deep 

 V-shaped notch. Operculum typically cyrtotomid. 



The type, U.S.N.M. No. 523515, bears the label "Mexico," without 

 specific locality. It has 6 whorls and measures: Height, 17.5 mm.; 

 greater diameter, 26.7 mm. ; lesser diameter, 19 mm. 



U.S.N.M. No. 15068 contains another specimen from the same source, 

 which is a little smaller and has 5.6 whorls and measures : Height, 13.7 

 mm. ; greater diameter, 22 mm. ; lesser diameter, 15.3 mm. 



This species, while resembling C. salleanum (von Martens), can 

 readily be distinguished from it by its more elevated spire and by the 

 deep V-shaped instead of U-shaped sinus. 



CYRTOTOMA FISCHERI, new species 



Plate 22, Figures 13-15 



1880. Habropoma (Cyrtotoma) mexicanum Fischer and Cbosse, Mission scien- 



tifique au Mexique et daus I'Amerique centrale, vol. 2, pi. 35, fig. 5. 

 1886. Habropoma mexicanum Fischee and Ckosse, ibid., p. 130, in part. 



Shell moderately large, reddish orange colored except the last whorl, 

 which is slightly paler; interior of aperture buff; peristome a little 



