374 FEKITSSACID^E. 



" The shell is imperforate, very small and slender, very nar- 

 rowly lanceolate, with obtuse, rounded, smooth apex ; smooth, 

 fragile, transparent (weathering to opaque white) ; aperture 

 usually less than half the total length, piriform ; outer lip arching 

 forward in the middle, acute; columella concave, more or less 

 distinctly truncate at base, usually somewhat calloused. Animal 

 blind, or at least without pigmented eyes. Jaw composed of many 

 narrow plaits. Eadula with 11,1,11 teeth in C. acicula, 18, 1, 18 

 in C. gundlachi, the central tooth much smaller than the laterals, 

 with a tricuspid reflection. Laterals symmetrical, tricuspid. 

 Marginal teeth low, wide, with two low denticulate cusps. The 

 genitalia, as figured by Lehmann for C. acicula, have the duct of 

 the spermatheca very short. An appendix, enlarged at the end, 

 is terminal on the penis. There is also a short accessory organ 

 anteriorly to the penis." (Pilsbry.} 



Subgenus GEOSTILBIA, Crosse. 



Geostilbia, Crosse, Journ. Conchyl. xv, 1867, p. 184 ; Pilsbry, Man. 

 Conch, ser. 2, xx, 1908, p. 43 (as section of Ceecilioides). 



TYPE, G. caledonica, Crosse. 



Range. India, Philippine Islands, New Caledonia, Hawaiian 

 Islands, West Indies, New Jersey, St. Helena, East Africa, 

 Mauritius, Seychelles, Comoro Group, Nossi Be. 



Differs from typical Ccecilioides in having the columella not 

 distinctly truncate, and having the outer lip thickened. 



The subgenus consists of a small number of species, some of 

 them of doubtful status. Two species are known from India. 

 Some seem to owe their distribution to tropical cultivation, 

 possibly that of sugar-cane, in a manner similar to that of Opeas 

 yracile and Subidina octona. 



340. Caecilioides balanus, Reeve. 



Achatina balanus (Benson), Reeve, Conch. Icon, v, 1850, Achatina, 

 pi. 20, fig. 109; Pfeiffer, Mon. Helic. Viv. iii, 1853, p. 506; 

 ibid., Conch.-Cab., Bulimus, 1860, p. 315, pi. 25, figs. 18, 19; 

 Benson, A. M. N. H. ser. 3, xiii, 1864, p. 137 ; Hanley & Theo- 

 bald, Conch. Ind. 1875, pi. 102, fig. 10 ; Blanford, J. A. S. B. 

 xlv, 1875, p. 43. 



Glandina balanus, Morelet, Journ. Conchyl. iii, 1852, p. 34. . 



Oleacina (Ferussacia) balanus, Adams, Gen. Rec. Moll, ii, 1855, 

 p. 106. 



Achatina (Caecilioides) balanus, Pfeiffer, Malak. Blatt. ii, 1856, 

 p. 170. 



Cionella (Acicula) balanus, von Martens, Die Heliceen, ed. 2, 1860, 

 p. 261. 



Francesia balanus, Paladilhe, Ann. Mus. Civ. Geneva, iii, 1872, 

 p. 11. 



Caecilianella (Geostilbia) balanus, Nevill, Hand List, i, 1878, p. 162, 



Geostilbia balanus, Theobald, J. A. S. B. xlvii, 1878, p. 147. 



