OREOBBA. PLANI8PIRA. 



153 



Helicostyla (Janira) codonodes, Morch, Journ. Conchyl. xx, 1872, 



p. 312. 

 Helix (Obba) codonodes, Pilsbrj, Man. Conch, ser. 2, vi, 1891, 



p. 236, pi. 53, figs. 8, 9, 10. 

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



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



Original description : " T. umbilicata, globoso-conoidea, solida, 

 oblique striatula, lineis spiralibus confertis subtilissime sculpta, 

 nitida, alba vel straniinea, castaneo 1-2 fasciata ; spira cam- 

 panulata, apice obtusiuscula ; anfr. 5| vix convex!, ultimas antice 

 clescendens, basi juxta aperturam gibboso-subconstrictus; apertura 

 obliqua, subquadrangulari-rotundata ; perist. incrassatum, re- 

 flexum, marginibus subapproximatis, callo nitido junctis, colu- 

 mellari intus protuberantia dentiformi munito, extus dilatato, 

 patente, sinuoso. 



" Diam. maj. 20, min. 17, alt. 17 mill." (Pfeiffer.) 



Hob. Nicobar Islands : Car Nicobar (Kjellerup), Camorta, Great 

 Nicobar (Eoepstorff, Wood-Mason, Stoliczka, Pliilippi); Kondul 

 (Roepstorff, Wood-Mason, Stoliczka). 



The species varies considerably in stature, the height of some 

 specimens equalling the major diameter. Morch describes three 

 varieties : minor, subcylindrica (height 27 mm.), and edentula 

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

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

 Morch 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. Conch, 

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



Subgenus TRACHIA, Albers. 



Trachia, (Albers) von Martens, Die Heliceen, 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, figs. 4-6 ; 



pi. 42, fig. 39 (anatomy). 

 Eurystoma, Albers, Die" Heliceen, 1850, p. 126 (non Rafinesque, 



1818). 



TYPE, Helix asperella, Pfeiffer. 



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

 Islands. 



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

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

 scopically granulated, sometimes ribbed when adult ; the apex 

 typically showing no distinct sculpture. Last wliorl strongly 

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

 expanded, reflexed below, the terminations approacliing and some- 

 times connected by a raised callus. 



