214 HELIX-OBBA. 



The peripheral narrow band is white in specimens which have 

 lost the very thin, yellow epidermis. Just below the sutures the 

 growth-striae are very sharp and crowded. The umbilicus is encir- 

 cled by a scarcely noticeable yellowish band. 



Kobelt (I. c.) and Mollendorff (Ber. Senckenb. Naturf. Ges. 1890), 

 have expressed the opinion that this form belongs to Hadra. It is, 

 however, a member of the typical group of Obba, as von Martens 

 has already said. 



H. LINN^ANA Pfeiffer. PL 54, figs. 18, 19. 



Shell depressed, acutely carinated, umbilicate; yellowish-brown, 

 spire paler, carina white ; deeply malleated above, indistinctly 

 spirally sulcate beneath. 



Shell umbilicated, depressed, convex above and below the acute, 

 compressed carina ; strong but not very thick ; rather roughly and 

 irregularly striated, sculptured with fine, oblique wrinkle-like im- 

 pressions, which become stronger below the keel, and run into in- 

 distinct spiral furrows, of which one furrow just below the keel and 

 one at the mouth of the umbilicus are more prominent. There is 

 also a row of regular, oblique depressions above the carina, becom- 

 ing stronger toward the mouth, continuing upward around the penult- 

 imate whorl. The color of the shell is whitish-yellow, but it is 

 covered by a persistant shining, beautiful brownish-yellow epi- 

 dermis ; toward the apex the color is lighter ; the keel is white. 

 The last whorl descends a little in front, is rounded below, a little 

 constricted at the aperture, having a deep groove behind the lip with- 

 in the umbilicus. The umbilicus is wide, cylindrical, showing all 

 the whorls. Aperture narrowly semilunar; peristome thickened, 

 guttered at the place of the keel, flesh-red or rosy, the throat also 

 rosy ; margins joined by a narrow but distinct callus ; upper mar- 

 gin expanded, basal margin broadly reflexed, arched, the short col- 

 umella dilated above, inserted quite within the umbilicus, of which 

 it covers at least a third part. (L. & K.) 



Alt. 33, greater diam. 65, lesser 59 mill. 



Sangir (Sanguir, Sanghir or Sangi) Is., midway between northeast 

 Celebes and Mindanao. 



H. linnceana PFR. P. Z. S. Lond., 1845, p. 43 ; Monogr. Hel. Viv, 

 i, p. 390. REEVE, Conch. Icon., f. 226. LOEBBECKE & KOBELT. 

 Jahrb. d. m. Ges., vii, 1880, p. 329, t. 7. f. 1, 2, t. 8, f. l.H. (Obba) 

 Linnceana Pfr., ANCEY, Le Naturaliste, viii, p. 366, 1886. Nanina 



