442 Dr. H. Woodward — On Fossil Shells, etc., from Sumatra. 



precisely like that of Cyrena sinuosa, and the famt shallow groove 

 down the posterior side is likewise traceable. The hinge-teeth both 

 in form and number also agree." 



The following is Deshayes' description of this species from the 

 Proc. Zool. Soc. 1854, p. 18 :— 



" Shell ovato-rotundate, tumid, cordiform, solid, very inequilateral ; 

 epidermis dark russet-colour, covered by slender transverse ridges ; 

 anterior end short, rounded, subtruncated posteriorly; deeply grooved 

 on the upper posterior side, grooves sinuous, decurrent ; umbones 

 tumid and short, generally eroded ; ligament narrow, partially con- 

 cealed ; valves white within, hinge thick ; tridentate on either 

 side ; teeth oblique, median and posterior tooth in right valve bifid ; 

 lateral teeth short ; anterior tooth thick, conical ; apex acute." 



The recent specimens in the British Museum were obtained from 

 the river Paningbang. Java, and are much thicker than the fossil 

 valve from Sumatra, and have their umbones more eroded. 



The thick rough dark olive-brown epidermis and prominent 

 ligament, seen in the recent examples, are of course wanting in the 

 fossil specimen. 



Measurement of right valve of fossil, 60 millimetres broad, height 

 55 mm. 



Locality : — Sumatra. (Subfossil ?). 



20. Pectunculus, sp. (cast of). PI. XL Fig. 2. 



The casts of this species of Pectunculus exhibit a portion only of 

 the interior shelly layer, and indicate a somewhat compressed and 

 internally-ribbed shell, showing also the characteristic dentition of 

 this genus. 



Dimensions : — Breadth 35 mm., height 37 mm. 



Formation : — Tertiary Clay-marls. 



Locality : — Island of Nias, Government of the West Coast of 

 Sumatra. 



21. Venus f non-scripta, Sowerby. PI. XI. Fig. 3. 

 Trans. Geol. Soc, 1840,2nd ser. vol. v. pi. xxv. fig. 8. 

 D'Archiac and Haime, Descrip. Anim. Foss. du Groupe Num. 



de l'lnde, 1854, p. 246, pi. xvii. fig. 7, la. 



The specimens of this shell obtained by M. Verbeek appear to be 

 identical with the above species described by Jas. de Carle Sowerby 

 from Soomrow, Kutch, India, and also noticed by D'Archiac and 

 Haime as being very common in the yellow sandy limestone of the 

 Hal a range in Scinde. 



The following is the description of this species, as given by Mr. 

 Sowerby : — 



"Transversely oval, convex, smooth, concentrically undulated, 

 lunette elongated, pointed, concave, breaks nearer the anterior 

 extremity, [and strongly recurved]. A smooth and thin shell, with 

 little of the aspect of a Venus." 



We agree with Mr. Sowerby in assigning this specimen to Venus 

 with considerable doubt. 



Measurements : — Length 53 mm., depth 50 mm. 



Formation and Locality : — The same as the preceding. 



