254 HELIX-CHLORITIS. 



the right one arcuate, narrowly expanded, columellar margin slop- 

 ing, somewhat reflexed, dilated at the umbilicus. (PfK) 

 Alt. KH, greater diam. 20, lesser 17 mill. 



Admiralty [stands. 



H. itrsina PER. P. Z. S. 1856, p. 384 ; Mai. Bl. 1856, p. 243 ; Mon- 

 ographia, iv, p. 290 ; Novit, Conch, i, p. 112, t. 31, f. 14, 15. 



H. DINODEOMORPHA Tapparone Canefri. PI. 52, figs. 66, 67, 68. 



Shell umbilicated, rather thin, discoidal lightly striate, under a 

 lens seen to be somewhat cancellated by very delicate, obsolete stride, 

 and all over covered with minute, close, elevated points; rufous or 

 livid-rufous, covered by a setigerous, freely deciduous brown 

 epidermis, the hairs close, short, stiff. Spire plane, immersed in the 

 middle. Whorls 4J, rather convex, separated by profound sutures, 

 the last whorl large, descending in front, subcompressed at the 

 moderate, profoundly perforating umbilicus, generally with some 

 very obsolete spiral grooves. Aperture rotund-lunate, oblique, 

 large ; peristome reddish, whitish at base, shortly expanded, reflexed 

 beneath, margins regularly curved, approaching and joined by a 

 thin callus ; right and basal margins regularly curved, columellar 

 dilated and reflexed above the umbilicus. 



Alt. 16 J, greater diam. 31, lesser 25 mill. (Canefri.} 



Central New Guinea. 



H. dinodeomorplia CANEFRI, Ann. Mus. Civ. Genova, xix, p. 168, 

 t. 4, f. 4-7 (shell) ; t. 7, f. 5, and t. 9, f. 2, 15, (anatomy.) 



Allied to H. erinaceus, but the umbilicus is narrower, more covered- 



H. SILENUS Angas. PI. 50, figs. 37, 38. 



Shell deeply and perspectively umbilicated, rather thin, globosely 

 depressed, pale brown, minutely and very finely punctately striate ; 

 spire immersed ; whorls 5, rounded, rapidly increasing, the last in- 

 flated, a little flattened at the upper part, descending considerably 

 in front, and somewhat angulated round the umbilicus ; aperture 

 oblique, rhomboidly lunate; peristome thin, whitish; margins ap- 

 proximating, the right flexuous, narrowly expanded ; the columellar 

 margin rounded, expanded, and slightly reflexed. (Angas.} 



Alt. 10, greater diam. 14, lesser 12 mill. 



New Ireland. 



H. (SemicormO Silenus ANGAS, P. Z. S. 1873, p. 182, t. 20, f. 2. 

 Compare H. gaimardi Dh. 



