KODUIiABIA. 



147 



Unio crispisulcatHS, Lea, A. M. N. II. x, 1862, p. 193 ; Sowerby, 



Conch. Icon, xvi, 1806, pi. 49, fig. 262. 

 Margaron ( Unio) crispisulcatus, Lea, Syn. ]870, p. 149. 



Original description : — Testa transverse subovata, subinsequi- 

 lateraii ; antice rotundata, postice superne descendente, leviter 

 angulata, demuni obtuse aiigulata, crassiuscula, compressiuscula ; 

 disco convexiusculo minutissime radiatiiu rugoso-costulato, costulis 

 nounullis acute divaricatis, posterioribus latioribus ; umbonibus 

 prominentibus, contiguis, apicibus acutiusculis ; epidermide luteo- 

 olivaeea, postice f uscata, hie illic noiinunquam viridiscente ; 

 dentibus cardinalibus utriusque valvse duplicibus, lamellatis, late- 

 ralibus obliquis, modice elougatis, valvse sinistrae duplicibus : 

 margarita caeruleo-albida iridesceute. 



Long. 28, lat. 45, diara. 16 niiu. 



Bab. Bangong Eiver near Thyet-Myo, Burma (W. Theobald); 

 Pegu (Indian Mus. Coll.). 



To the above description is appended the following note : — 



" Tlie anterior cicatrices are distinct, the posterior confluent, 

 the apical ones above the moderate angular cavity, and running 

 under the cardinal tooth. 



" The delicate sculpture over the whole disk of this shell is 

 peculiar. In form it does not approach any Gangetic type." 



A well-marked and apparently very constant form, the large 

 series of about twenty-three specimens in the Indian Museum 

 Collection, from the Irrawaddy near Thyetmio and Pegu, practi- 

 cally showing no variation Avhatever. 



283. Nodularia (Radiatula) lima, /SwnjwoH. 



Nodularia (liadiatida) lima, Simpson, Washington, D.C., Smiths. 



Inst., Nat. Mus. Proc. xxii, 1900, p. 820. 

 Unio radula (Benson), Hanley, Ilec. Biv. Shells, Supp. 1856, p. 382, 



pi. 23, tig. 41 ; H. & T., C. L p. 5, pi. 10, tig. 3. 

 Dysonomia radula, Rochebrune, Bull. See. Philoni. Paris vi, 1882, 



p. 42. 



Original description : — Transversely oboval, inequilateral, not 

 very thick, rather compressed, olivaceous, sculptured as in U. sco- 

 bina, but rather more linearly and transversely ; ventral and front 

 dorsal edges convex and subparallel ; hinder extremity rounded, 

 narrower : umbonal ridge inconspicuous, umbonal slope simple ; 

 neither the eroded umbones nor the ligament prominent ; nacre 

 bluish ; umbonal cavity shallow; hinder tooth strong, complicated ; 

 front latei-al tooth elongated, a little curved. 



Long. 19, lat. 32 mm. 



Hab. Assam ; Siliguri and Sikkim (Indian Mus. Coll.). 



Extremely variable in sculpture and form ; in some speci- 

 mens the corrugations extend over the whole surface of the shell, 

 while in others they are confined merely to the umbonal region ; 

 in o-eneral outline it varies from ovate to trapezoidal as the 



l2 



