46 THE NAUTILUS. 



LAND SHELLS OF TANGULANDANG (TAGOLANDA.) 



BY H. A. PILSBRY. 



Tagolanda or Tangulandang is a small island between Celebes and 

 Mindanao, about fifty miles from the N. E. extremity of the former, 

 and between that and Sangi (Sangir). 80 far as I know, nothing 

 has been known of its mollusks. A collector for Mr. Walter F. 

 Webb, of Rochester, N. Y., took a number of land shells there, 

 which show that the fauna has relations with both Celebes and Sangi. 

 The list follows. 

 Gyclotus politus Sowerby. 



Found also in Celebes, Flores, Timor and some other islands of 

 the same region, but not north of Tagolanda. 

 Leptopoma tagolandense n. sp. PI. IV, figs. 1, 2. 



A species of the group of L. manadense. The shell is narrowly 

 umbilicate, acutely carinate, slightly wider than high ; typically 

 corneous-whitish densely speckled with brown and encircled with a 

 dark chestnut band below the periphery, but sometimes wanting this 

 band. The brown spots are larger and rather regularly spaced just 

 above the periphery and below the suture; the first three whorls are 

 uniform yellowish-corneous or brown. Whorls 5^, all rather strongly 

 convex, the last having an acute, projecting periferal keel, below 

 which it is moderately convex. The first half-wborl is smooth; then 

 5 to 7 fine spiral threads begin. On the fourth whorl interstitial 

 spiral striae appear, continuing to the end, the primary spirals re- 

 taining their prominence as subequally spaced cords among the fine 

 spiral striae of the later whorls. The base is finely striate the striae 

 slightly unequal. Aperture oblique, sub-circular; lip white, not 

 continuous, the upper margin expanded, basal margin reflexed; 

 columellar circular dilated. Alt. 14, diam. 15 mm.; width of aper- 

 ture 8 mm. 



This species differs from L. menadense in sculpture. It stands 

 near L. vexillum, well figured by the Sarasins, but the last whorl is 

 more convex above than below the keel (whereas vexillum is more 

 convex below), and there are fewer major spiral cords, 5 to 7 on the 

 upper surface of the last whorl, while vexillum has 10. 



There is also a form without brown markings, the shell bluish- 

 white, yellowish-white at the spire. This may be called var. immac- 

 tdata. Some individuals have a dark chestnut band below the keel. 



