274 PROCEEDINGS OF THE NATIOlSrAL MUSEUM vol. 85 



The type, U.S.N.M. no. 468886, has 4.2 whorls remaining and 

 measures: Length, 22.2 nnn; greater diameter, 15.7 mm; lesser 

 diameter, 10.9 mm. 



CHONDROTHYRETES SHUTTLEWORTHI MAMEYENSIS. new subspecies 

 I'l.ATlC IS, FiGURK S 



This race comes from the JNIogote jSIamey, the northern one of 

 the two hills about 2 miles south of the gap that separates the Sierra 

 San Andres from the Sierra Guacamayas. It is a small, pale, thin- 

 shelled race, narrowly rayed on tlie back of the outer peristome. 



The type, U.S.N.M. no. 468889, has 5.0 whorls remaining and meas- 

 ures : Length, 21.0 mm ; greater diameter, 14.0 mm ; lesser diameter, 

 10.2 mm. 



CHONDROTHYRETES SHUTTLEWORTHI CLIVICOLA, new subspecies 



Plate 19, Figure 4 



This race occupies the series of paredones on the east side of the 

 Bio Santa Cruz and ranges from Mogote Indios to Mogote Colorado 

 to Mogote Bosque. It has the axial threads equaling the spiral on 

 the last whorl and so renders this finely latticed. It is a medium- 

 sized race, varying greatly in coloration, but is always more or less 

 interruptedly spirally banded. 



The type, U.S.N.M. no. 468891, comes from the Mogote Bosque, 

 has 4.0 whorls remaining, and measures: Length, 22.5 mm; greater 

 ^diameter, 15,0 mm; lesser diameter, 11.0 mm, 



CHONDROTHYRETES SHUTTLEWORTHI CATALINENSIS, new subspecies 



Plate IS, Figure 9 



This subspecies, which also has the last whorl strongly latticed, 

 was collected about La Catalina, which is several miles to the north 

 of Mogote Bosque. It is a small, pale, thin-shelled race, with the 

 outer peristome conspicuously rayed. 



The type, U.S.N.M. no. 468893, a complete specimen, has 6.2 whorls 

 and measures: Length, 19.5 mm; greater diameter, 12.6 mm; lesser 

 diameter, 9.2 mm, 



CHONDROTHYRETES SHUTTLEWORTHI PERPLEXA, new subspecies 



Plate IS, Figure 7 



At the Mogote de la Finca, a little southeast of the Sierra la Guira, 

 Henderson and Natenson collected a thin-shelled small race, which 

 has the last whorl latticed, in this way resembling C. shuttleioorthi 

 clivicola and C. s. catalinensis. This is on the west side of the Rio 



