OBEOBB A . — PL ANISPIIIA . 



153 



Helicostiila {Janira) codonodes, Morch, Jouru. Conchyl. xx, 1872, 



p. 312. 

 Helix (Obba) codonodes, Pilsbry, Mau. Conch, ser. 2, vi, 1891, 



p. 236, pi. TjS, figs. 8, 9, 10. 

 Obba (Oreobba) codonodes, Pilsbrv, Man, Conch, ser. 2, ix, 1894, 



p. 109, pi. 19, fig. 11. 



Original description : — " T. umbilicata,,. globoso-conoiclea, solida, 

 oblique striatula, lineis spiralibus confertis subtilissime sculpta, 

 nitida, al-ba vel straminea, castaneo 1-2 fasciata ; spira cam- 

 panulata, apice obtusiuscula ; aufr. 5| vix convexi, ultimus antice 

 descendens, basi juxta aperturam gibboso-subconstrictus; apertura 

 obliqua, subquadrang'ulari-rotuudata ; perist. iucrassatum, re- 

 flexum, niarginibus subapproximatis, callo iiitido junctis, colu- 

 mellari iutus protuberautia dentiformi inunito, extus dilatato, 

 pateute, sinuoso. 



"Diam. maj. 20, niin. 17, alt. 17 mill." (Pfeifer.) 



Hub. Nicobar Islands : Car Nicobar {Kjellerup), Camorta, Great 

 Nicobar {Roepstorff, Wood-Mason, Stoliczlca, PUlippi); Kondul 

 (Moepstorff, Wood-Mason, Stoliczlca). 



Tlie species varies considerably in stature, the height of some 

 specimens equalling tlie major diameter. Morch describes three 

 varieties : minor, suhcijlindrica (height 27 mm.), and edenhda 

 (height 28 mm.), while Godwin-Austen enumerates in addition : 

 efasciata, subcarinata, and albolabris, all nomina nuda of Nevill. 

 MiJrch also mentions a unicolorous form from Car Nicobar, which 

 is probably Nevill's efasciata. 



Genus PLANISPIRA, Beck. 



Planispira, Beck, Index Moll. 1838, p. 29; Pilsbry, Man. Concli. 

 ser. 2, ix, 1894, p. 110. 



Subgenus TRACHIA, AJhers. 



Trachia, (Albers) von Martens, Die Ileliceen, ed. 2, 1860, p. 160; 



Stoliczka, J. A. S. B. xl, 1871, p. 223 (anatomy) ; Pilsbry, Man. 



Conch, ser. 2, ix, 1894, p. 114, pi. 32, figs. 44, 45 ; pi. 34, tigs. 4-6 ; 



pi. 42, fig. 39 (anatomy). 

 Eurystoma, Albers, Die" Ileliceen, 1850, p. 126 (nou Piafinesque, 



1818). 



Type, IleVuv asperellcc, Pfeiffer. 



Range. India, Burma, Ceylon, Mergui Archipelago, Andaman 

 Islands. 



" Shell varying from discoidal to depressed-globose, umbihcate, 

 the surface rather roughly sculptured, hairy when young, micro- 

 scopically granulated, sometimes ribbed when adult ; the apex 

 typically showing no distinct sculpture. Last tvJiorl strongly 

 dejlexed in front. Aperture very oblique, small, the lip well 

 expanded, reflexed below, the terminations approaching and some- 

 times connected by a raised callus. 



