NO. 1483. 



UROCOPTID MOLL USKS—BARTSCH. 



159 



Measurements of Microceramus texasianus. 



MICROCERAMUS MEXICANUS Pfeiffer. 



There are five lots, 24 specimen.s, of this species in the collection of 

 the U. S. National Museum, which furnish the following data: 



Jfeasiireinents of Microceramus mexicamis. 



172398 



172398 



172398 



172398 



172398 



172398 



110389 



110389 



110389 



110389 



110389 



160146 



160146 



188184 



24961 



Average 

 Largest . 

 Smallest 



Number 



of 

 whorls. 



Length. 



mm. 

 7.8 

 7.4 

 7.5 

 7.7 

 7.8 

 7.3 



10.2 

 9.5 

 9 



9.6 

 9.8 

 8.3 

 8.4 

 8 4 

 7.8 



Diameter 

 of penul- 

 timate 

 whorl. 



mm. 

 3.2 

 3.2 

 3.2 

 3.3 

 3.4 

 3.2 

 4 



3.8 

 3 7 

 3 8 

 3.9 

 3.7 

 3.5 

 3.4 

 3.3 



8.41 

 10.2 

 7.3 



3.5 



4 



3.2 



Locality. 



Victoria 



Tamaulipas' 

 do 



.do. 

 .do. 

 .do. 



Alvarez Mts., San Luis Potosi. 



do 



do 



7,200 feet altitude 



do 



City of Mexico 



do 



Morelos 



Mexico 



Collector or donor. 



H. A. I'ilsbrv. 



Do. 



Do. 



Do- 

 Do. 



Do. 

 E. Palmer. 



Do. 



Do. 



Do. 



Do. 

 Woodworth. 



Do. 



Do. 



MICROCERAMUS CONCISUS Morelet. 



There are two lots of this species in the collection of the U. S. 

 National Museum, Cat. No. 188185, from Campeche, Campeche, iSIex- 

 ico, consisting of three specimens collected by E. W. Nelson, and 



Proc. N. M. vol. xxxi— 06 11 



