64 LAMELLIBRAKCniATA. 



MULINIA. 



Ovato-trigonal, sub-angular on each side ; hinge with a strong 

 cartilage tooth ; lateral teeth short, simple ; ligament internal, in the 

 cartilage plate ; pallial sinus angular. 



25. M. notata, sp. nov. Thick, solid, concentrically striated 

 round the margin, lunule and area plicately rugose, rest smooth ; 

 anterior end shorter, attenuated, right valve with two lateral teeth on 

 each side, left valve with the anterior hinge tooth bifid, and the 

 anterior lateral deeply notched ; cartilage pit broad and flat ; pallial 

 sinus reaching to the centre of the shell. White, with brown spots 

 and dashes ; covered with a thin brown epidermis. Height, 2 5 ; 

 length, 4. 



Stewart's Island, 25 fathoms. 



DARINA. 



Oblong, compressed, rounded and slightly gaping at the two 



extremities ; uinbones sub-posterior ; hinge with a large cartilage 



plate ; lateral teeth small, joining the cardinal tooth ; ligament 

 external, marginal, separated from the cartilage. 



26. D. pusilla, sp. nov. Obtusely trigonal, thin, white, pellucid, 

 smooth, finely longitudinally striated. Height, '7 ; length, I'l. 



Cook Strait ; Stewart's Island. I have only seen single valves. 



LUTRARIA. 



Oblong, elongate, rather compressed, sub-equilateral ; umbo sub- 

 anterior ; hinge with the cardinal teeth distinct ; anterior lateral teeth 

 erect, hinder very small. 



Europe. Australia. Philippines. 



* 27. L. deshayesii, Reeve. Shell elongately oblong, thinnish, 

 rather narrow, concentrically densely striated, striae somewhat wrinkle- 

 like ; sides equally rounded, the anterior very long, much gaping. 

 Bust-flesh tinged, covered with a greenish olive epidermis. (Reeve.) 



* 28. L. lanceolata, Heeve. Shell compressly flattened, an- 

 teriorly angularly attenuated ; smooth, or very finely concentrically 

 striated ; spoon-shaped tooth of the hinge peculiarly angularly pro- 

 duced, inclined posteriorly, appressed upon an internal radiating rib. 

 Flesh tinged, faintly stained with rust, covered towards the margin 

 with a horny epidermis. (Reeve.) 



ZENATIA. 



Equivalve, inequilateral, oblong, umbo anterior, sub-marginal, gaping 

 at both extremities, covered by a thick and projecting epidermis ; 

 cartilage plate prominent, cardinal teeth distinct, no lateral teeth ; 

 pallial sinus deep, horizontal ; hinge posterior. 



29. Z. acinaCGS, Quoy, I.e., iii., p. 545. Thin, compressed, oblong, 

 back rather concave ; anterior end very short, rounded ; posterior long 



