354 PROCEEDINGS OF THE ACADEMY OF [1898, 



A NEW LAND SHELL FROM CLARION ISLAND. 



BY HENRY A PILSBRY. 

 Succinea Mcgregori n. sp. 



Shell ovate, thin, red-amber colored, irregularly wrinkled-striate, 

 composed of 3£ very convex whorls separated by deeply 

 impressed sutures. Aperture two-thirds the length of the 

 shell, regularly ovate, oblique, its width contained If 

 times in its length ; columella arcuate, its edge thread-like 

 above. 



Alt. 13J, diam. 8, length of aperture 9 mm. 



Alt. 12 J, diam. 7, length of aperture 8J mm. 



Clarion Island, collected by Mr. R. C. McGregor, in whose honor 

 the species is named. 



This species closely resembles S, Donneti Pfr. from Chili in form, 

 but differs in color, the Chilian species being pale yellowish corneous. 

 It has the deep reddish hue of many Hawaiian Succineas, such as S- 

 canella Gld., or the Japanese group to which S. lauta belongs. S. 

 Oregonensis Lea is decidedly shorter and not of so dark a color. 



At my request Mr. McGregor furnished the following notes on 

 Clarion Island : 



" Clarion Island is some three hundred miles southwest of Cape 

 San Lucas. The sandy beaches are covered with broken coral. 

 Back of the beach where we landed is level ground for a quarter of 

 a mile, covered in places with cacti and vines {Ipomaza cathartica 

 Poir., Phaseolus atropurpureus D. C and Sophora tomentosa L.). 

 The troublesome bush, Caesalpinia Bonducella Roxb., with its sharp, 

 curved spines, abounds on the hillsides and the flats. The interior 

 of the island rises in more or less rough hills. There are quite a 

 number of elevated flats or plateaux covered with a tangle of vines, 

 grasses and shrubs. Among the last are Euphorbia Clarionensis 

 Brandegee and E. Califomica Benth., on the stems of which was 

 found the only land shell. This mollusk closely resembles the bark 

 of these plants, and was very abundant. One might collect twenty 

 or thirty specimens from a single plant. 



"Clarion Island is decidedly tropical, though it includes in its 

 fauna insular forms of birds of such temperate zone genera as Speo- 

 tyto, Zenaidura and Troglodytes. There are no mammals on the is- 

 land. Lizards and several species of snakes were captured." 



