NO. 1483 



UROCOPTTD MOLL USKS—BA RTSf'fL 



119 



CCELOCENTRUM (SPARTOCENTRUM) IRREGULARE Gabb. 



There are two specimens of this species in the collection, Cat. No. 

 107326, U.S.N. M., donated b}^ the author. The}" are part of the tj^pe 

 lot, which was collected at Mnlege, Lower California. Both are decol- 

 lated. 



Measurements of Qelocentrum {Spartocentrum) irrec/vlare. 



CCELOCENTRUM (SPARTOCENTRUM) MINORINUM GABBI Pilsbry. 



There are two lots of this form in the collection of the U, S. National 

 Musemn, one, two specimens, Cat. No. 57934, U.S.N.M., is part of the 

 type lot collected by W. M. Gabb at Mulege, Lower California; the 

 other, Cat. No. 187484, U.S.N.M., collected by E. W. Nelson and E. A. 

 Goldman at Guajadami, Lower California, contains sixteen specimens, 

 eight of which are perfect. The following table gives a list of meas- 

 urements: 



Measurements of Cwlocentrum (Spartocentrum) minorinwn gabhi. 



The Guajadami specimens appear uniformly a little larger than our 

 specimens from ^lulege. 



CCELOCENTRUM (SPARTOCENTRUM) EISENI Pilsbry. 



There are two specimens of this species in the collection of the 

 U. S. National Museum, Cat. No. 160503, collected by G. Eisen at 

 Cape St. Lucas, Lower California, and presented to the Museum by 



