NODULARIA. 145 



lamiuatis erectisque, lateralibus laminatis brevibusque; margarita 

 pertenui albaque. 



Long. 20, lat. 38, diam. 18 mm. 



Hah. Burrill Eiver {Dr. Burrourjh) ; specimens in Britisli 

 Museum from Moradabad, Agra, and Rohilkund Streams (the last 

 figured in Couch. Icon. pi. x, fig. 1); in Indian Museum from 

 Assam and Saharanpur. 



The above description is amplified by the following note :— 



" Shell ovate, transverse, inequilateral, inflated, pellucid : sub- 

 stance of the shell very thin ; beaks slightly elevated, rounded 

 and devoid of undulations : ligament very small : epidermis olive, 

 very tliin and smooth : rays obscure : cardinal teeth large, erect, 

 aud lamelliform ; lateral teeth short and lamelliform : anterior 

 cicatrices slightly confluent: posterior cicatrices confluent : dorsal 

 cicatrices ]iot perceptible : cavity of the beaks wide : nacre very 

 thin and bluish white. 



"■liemarlcs. — It is a perfectly distinct species, and 



may easily be recognised by its form, its pellucidness and its 

 smooth olive-coloured epidermis. It somewhat resembles a young 

 Amdonta on the exterior, but the elevated lamelliform teeth 

 easily distinguish it from that genus. Its resemblance to a 

 Spajiish olive is very striking." 



280. Nodularia (Nodularia) nuttalliana {Lea). 



Nudularia {Nodularia) mdfalliana (Lea) ; Simpson, Washin"-ton, 

 D.C, Smiths. Inst., Nat. Mus. Proc. xxii, 1900, p. 817. " 



Unio nuttallianus, Lea, Proc. Ac. Nat. Sci. Philadelphia, viii, 

 1856, p. 103; Obs. Genu8 Unio, vi, 1857, p. 30, pi. 30, fig. 25- 

 Journ. Acad. Nat. Sci. Philadelphia, iii, 1858, p. 310 dI 3o' 

 fig. 25 ; H. & T., C. I. p. 19, pi. 41, figs. 5, 6. ^ " ' 



Murgaron ( Unto) nuttallicmm, Lea, Syu. 1870, p. 74. 



Original description :— Testa laevi, elliptica, subinflata, in«qui- 

 laterali ; valvulis tenuibus ; natibus prominulis ; epidermide 

 olivacea, eradiata, valde polita ; dentibus cardinalibus parvis, rectis, 

 compressis crenulatisque ; laterahbus subcurtis, subrectis I'amella- 

 tisque ; margarita salmonis colore tincto et iridesceute. 

 Uab. India {Prof. Thomas Xuttall). 



No dimensions are given with the above description; there are, 

 however, several specimens of the species in the British and 

 Indian Museum Collections, of which the measurements of three 

 are as follows ; No. 1 being in the British and Nos. 2 and 3 in the 

 Indian Museum. 



1. 2. 3. 



I^ong 23-25 19 17-75 mm. 



Lat 38 31-25 28-5 mm. 



Diam 15 11-5 10-5 mm. 



Allied to N. olivaria, but of a darker colour and more convex, 

 with more rounded ventral margin and generally ovate form. 



L 



