WEST COAST PULMONATA. 365 



to 135 miles south of Monterey, where only it was supposed ta 

 be found. It is thus limited to the narrow strip of 

 steep, rugged country, forming the west slope of the Santa. 

 Lucia Mts., Avhich is a ridge about 20 miles wide 

 close to the sea, and 4,000 to 6,000 feet high, receiving most 

 of the moisture from the sea winds and cutting it off in great 

 degree from the valleys eastward, as well as from the parallel 

 and lower ranges of mountains for about 50 miles eastward, 

 and from much of the highest portion of the Sierras. The 

 only terrestrial Pulmonata known in these arid valleys are 

 Succineas wherever marshes or springs are permanent. 



It has been long known that a variety of H, traskl was 

 found near Paso Robles at the south end of the Santa Lucia 

 range, 25 miles e ist of San Simeon, and several hundred 

 feet high on the east slops. I included it in the description 

 of H. diahloemis in 1872, though somewhat different from 

 the northern type, but since then have considered them all 

 as varieties of H. traskl. It is evident from the varieties 

 already mentioned, that the distinctions between these and 

 H. dapetithoiiarsi become more decided towards the south 

 and east, or towards a drier and hotter climate. But the 

 anatomy of the animals is stated by Binney to be so differ- 

 ent that unless these connecting links show an intermediate 

 animal there should be no confounding of the two in one 

 species. The animal of var. diahloensis is described by 

 Binney as very near that of trasld. It is however still un- 

 settled whether the internal structure of these animals is less 

 variable than the external. On account of the great aridity 

 of the valleys for 216 miles N.W. of Uvas Pass, which 

 the main routes of travel traverse, no species seem to have 

 been found on the east slopes of the Mt. Hamilton range 

 50 to 60 miles from the sea. But as No. 5 is found at the 

 pass 45 miles inland, it is possible that the same, or a variety 

 of it, exists above 4,000 feet even in this arid range. 

 Paso Robles is 108 miles distant from Uvas Pass, 

 but nearer the coast and at the head of the 



