162 SHELLS OF LOWER CALIFORNIA— STEARNS. vol.xvii. 



to the Museum several years ago by the Mexicau Geographioal Com- 

 mission. 



HKLIX (STENOTREMA) HIRSUTUM, 8 ay. 



Examples. Banks of Yaqui Kiver near Guaymas (No. 37282, IJ. S. 

 1^. M.).* 



(3f this form Mr. W. G. Biuney remarks, iu his "Manual of American 

 Land Shells," page 279, a ''postpliocene species now found over the 

 northern and interior regions as far as Kansas and Virginia, and even 

 into Alabama." Mr. Pilsbry, in his recent Check List of N. A. Land 

 Shells, credits it to the "Eastern United States." 



Upon examining some shells collected on the west coast several years 

 ago by Dr. Edward Palmer, I found that he had obtained this form 

 on the banks of the Yaqui River. It is noteworthy how frequently of 

 late years species heretofore regarded as exclusively eastern or north- 

 eastern turn up somewhere on the West coast. A few years ago Dr. 

 Cooper sent specimens of what proved to be, on Dr. Dall's identifica- 

 tion, Hyalina Binneyana Morse, from Vancover Island, B. C, previously 

 credited to the "Southern part of Maine, Michigan, Massachusetts, 

 Vermont," and Mr. Hemphill found HeUcodiscus lineatus, another of 

 Say's species, several years ago in Oakland, on the eastern side of San 

 Francisco bay. This had jiieviously been reported as far to the west 

 as the Rio Chama, New Mexico. , 



Dr. Cooper, in his recent i)ai)er before referred to, describes a varietal 

 form of the last named species, to which he has given the name of 

 Helocodiscus Uneatus Sonorensis detected near San Miguel, in the State 

 of Sonora. 



Family Obth alioid^. 



OKTHALICUS UNDATUS, Bingniere. 



One specimen. Tres Marias (No, 5097.'), U. S. N. M.). 



The above example was collected living; the color pattern is of the 

 usual irregularly un<lulating zigzag wave, and clouds, with rather a 

 darker hue than the average of Florida specimens, and the aperture, 

 or around the aperture, exhibits more or less of the darker tint that 

 prevails over the general surface of the shell. The museum contains 

 several examples of this species from Altata (No.50973, U. S. K.M.), and I 

 presume it is found atmany points on the mainland in the timbered regions 

 of the Mexican States of Sonora and Cinaloa, from whence it is brought 

 in the dyewoods to the embarcaderos along the gulf shore. The 

 Altata shells are on the whole somewhat lighter in general tone, though 

 exhibiting the usual color pattern. The individuals of this form vary 

 greatly in proportions as well as in color markings; in the former 



'Vide ''Nautilus," November, 1889. 



