1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 163 



respect they are like the BulhnuU of Texas on the one side and Lower 

 California ou tlie other. 



OKTHALICUS UNDATIJS, J'.r u j^ui ere . 

 var. ?;=(>. vielanochilus, Valenciennes. 



One specimen. Tres Marias (So. 50974, U. S. N. M.). 



A living example nearly white, npper whorl pinkish white; without 

 color markings save two narrow dark brown oblique rarical lines on 

 the penultimate and final whorl. The parietal wall and the edge of 

 the outer lip blackish-brown as usual in the common dark colored 

 specimens from Central America. Length 2.20 inches. 



I regard this as simply a variety of the previous form, and both 

 the same with the Central American and Florida shells so far as species 

 are considered. The albinoism of the foregoing specimen is of interest 

 when considered in relation to the environment and general character of 

 the region wherein it is indigenous. 



Family lixiLiMiTLiD.E. 



BULIMULITS (SCTTAUTS) I'.AILKYI, Dall. 



^= B. Xantiisi, var. Steartu^, not Hinnvti. I'roc. U. S. Nat. Mu8., vol. xvi, 181*8, i)p. 

 640-641, pi. r.xxi, tij^. 1. 



Several examples. 



Cape St. Lucas (No. 58649, U. S. N. M.); Guaymas, E. Palmer (Xo. 

 101756, U. S. N. M.); Ortiz, Y. Bailey (No. 106004, Ti. S. N. M.). Five 

 specimens of what I regarded as a variety of Mr. Binney's species were 

 given to me by Mr. Fisher. The precise locality not stated, or else the 

 label was mislaid. The smallest of the five is larger than Binney's 

 figure in his Land and Fresh Water Sliells of North America, part 1, 

 p. 210. The incremental lines are well marked, but the revolving lines, 

 an inconstant and quite uncertain character in West American Land 

 Shells, I have barely detected in some of the specimens, of which all 

 but one are de;id. The largest measures 1.05 in length and .55 inch in 

 breadth. They vary in solidity and opacity. This form is not confined 

 to the peninsula. Tlie National collection has received examples from 

 the Department of Agriculture (No. 106004, V. S. N. M.), collected by 

 Mr. Vernon Bailey "among rocks on the top of a hill 200 feet high," at 

 Ortiz in the interior, a few miles back of Guaymas, in the fall of 1889; 

 this fact as to locality is of some importance, as heretofore our knowl- 

 edge of the distribution of these Mexican forms has been confined 

 almost exclusively to the peninsula. 



The discovery of Mr. Binney's type of B. Xantnsi shows that the 

 shells collected by Mr. Bailey are nut referable to said species even in 

 a varietal relation. 



Mr. Gustav Eisen, of the California Academy of Sciences, has col- 



