244 HELIX-CHLORITIS. 



H. UNGUICULINA Martens. PI. 50, figs. 29, 30, 31. 



Shell inflated, with immersed spire, narrowly umbilicated, lightly 

 striatulate, little shining, obsoletely pilose, olivaceous-brown, con- 

 colored ; spire profoundly sunken, suture profound; whorls 5, sub- 

 angular at the suture, the last one tumid, obtusely angulated beneath, 

 excavated inside of the angle, deeply descending in front ; aperture 

 little oblique, subtrigonal-lunate, margins strongly arcuate near 

 their insertions ; peristome not thickened, all around rather widely 

 expanded, white. Alt. 10, greater diam. 17, lesser 13 mill ; apert. 

 length 8*, width 9 mill. 



Alt. 8, greater diam. 13, lesser 10, apert. length 6, width 6J mill. 



Kajeli and Oki, Island of Burn, Moluccas. 



H. unguiculma MART., Mai. Bl. x, 1863, p. 113, 135 ; Preuss. 

 Exped. Landschu. p. 278, t. 14, f. 5. PFR. Mon. v, p. 390. 



A miniature H. ungulina ; the two angles are often more promi- 

 nent than in that species ; the peristome is proportionally wider. 

 Differs from H. unguiculastra in the deeply sunken spire, etc. Tra- 

 ces of short numerous hairs are seen on the best-preserved speci- 

 mens. 



H. BIOMPHALA Pfeiffer. Unfigured. 



Shell moderately umbilicated, depressed, rather solid, striatulate 

 and covered with short down ; brown ; spire profoundly sunken ; 

 whorls nearly 5, swollen, the last one rapidly increasing, in- 

 flated, high, perceptibly descending in front, not angulated around 

 the umbilicus. Aperture slightly diagonal, lunar-rounded, pearly 

 inside ; peristome thin, flesh-colored, margins converging, the right 

 margin ascending from the insertion, subregularly arcuate, narrowly 

 expanded; columellar margin subarcuate-sloping, narrowly reflexed. 

 Alt. 10-11, greater diam. 20, lesser 17 mill. (Pfr.) 



H. biomphala PFR., P. Z. S. 1862, p. 272 ; Mou. v, p. 391. MAR- 

 TENS, Preuss. Exped., Landschn., p. 279. 



Similar, says v. Martens, to H. unguiculina, especially in the deeply 

 concave upper surface, but larger, umbilicus and spire-cavity nar- 

 rower, the umbilicus not encircled by an angulation. 



H. MARTENSI Pfeiffer. Unfigured. 



Shell inflated-discoidal, rather widely umbilicated, lightly stria- 

 tulate, chestnut colored; spire little sunken, sutural angle distinct; 

 no angulation around the umbilicus ; whorls 4j, the last deeply de- 



