106 TEINOSTOMA. 



T. cosTu LATUM, Foliii. PI. 35, fig. 75. 



Deeply uiubilicated, depressed, disk-like, very slightly convex 

 above, subplauate below, vitreous, whitish, lougitudiually minutely 

 costulate, above the base these are decussated by a spiral thread ; 

 whorls 3, rapidly increasing, base with cord below the periphery ; 

 aperture oblique, subcordiform, margins subacute, joined by an 

 oblique channel above the penultimate whorl. Diam. 2 mill. 



Cape Sta. Anne, W. Africa. 



Subgenus Leucorhynchia, Crosse, 1867. 

 T. Caledonicum, Crosse. PI. 35, figs. 85, ^Q. 



Subdiscoidal, slightly convex above and below, polished, shining, 

 whitish; whorls 3, flattened, rapidly increasing, periphery carinate; 

 peristome continuous, simple, thickened at the base and produced 

 into a tongue-like callus past the umbilicus, leaving a perforation 

 between it and the columellar wall. Diam. 3 mill. 



New Caledonia. 

 T. Crossei, Tryon. PI. 35, figs, ^a, 866. 



Diflfers from the above in having a rounded periphery ; surface 

 polished, without a trace of strife. Diam. 3 mill. 



Singaj)ore, (Archer). 



Subgenus Microtheca, A. Ad. 1863. 



T. crenelliferum, a. Ad. PI. 35, figs. 76, 77. 



Thick, globose, broadly umbilicated, longitudinally, somewhat 

 obliquely plicate, whorls crenulated at the channeled suture, umbuli- 

 cus Avith a crenulated marginal angle, peristome thick. 



Diam. 3'5 mill. Japan. 



Subgenus Morchia, A. Adams, 1860. 



T. OBvoLUTA, A. Ad. PI. 35, figs. 78, 79. 



Obliquely ovate, laterally compressed, last whorl angular above 

 and below, the spire depressed, umbilicus wide, its margin suban- 

 gulate, aperture obliquely ovate, j^eristome thick, continuous. 



Diam. 3-5 mill. 



Japan. 



T. jMoreleti, Fischer. PI. 35, figs. 80-82. 



Depressed, whitish, whorls 4, the first ones obliquely immersed, 

 the last embracing, obliquely flattened with a tuberculate-crenate 



