a special hinge area between them and the beak, and below the 

 latter not interrupted by a pit ; ligament apparently external, 

 posterior to the beak. (Tryon.) 



Tellistomya ethekidgei. (nov. sp.) 



Shell inequilateral, trigonal, elongately oval ; concentric 

 stria? well-defined ; valves moderately convex ; anterior side 

 straight and somewhat truncate, rounded inferiorly ; posterior 

 slope longest, scarcely concave, produced to a sharp point ; 

 ventral margin gently curved, simple. 



Length, 13 millimetres ; height, 27 mil. 



Common in Upper Palaeozoic Marine beds at Porter's Hill, 

 Hobart. 



This shell is easily distinguished from T. Darwinii, by its 

 more convex valves, and by its more narrowly elongate form. 



Conulaeia. (Miller.) 

 Fdym Conulus (a little 



(Sowerby, 1818.) 



cone.) Syn. Conulites, Schloth, 

 Distr. Possil about 100 sp. Silurian to Garb. N. America, 

 Europe, India, Australasia. 



Shell four-sided, straight, and tapering, the angles grooved, 

 sides striated transversely, apex partitioned off ; the Conularia 

 Were the giants of the Pteropoda. 0. inornata (Dana) of 

 Australia is supposed to have been 16 inches long. (Tryon.) 



CoNr/EARTA DEKWENTENSIS; (NOV. Sp.) 



Shell quadrangular, pyramidal ; section rectangular ; apical 

 angle of larger sides about 25 deg., relation of the two larger 

 sides to the two small ones, nearly as 4 to 3 ; faces flat or very 

 slightly convex. A strong longitudinal furrow runs down 

 each of the lateral angles, and a faintly marked one longitu- 

 dionally divides each face into two equal parts ; transverse 

 thread-like riblets gently symetrically arched on each face some- 

 times interrupted and alternate at the point where they are 

 intersected by the faint mesial longitudinal furrow, but 

 generally continuous ; riblets coarser and more distant than in 

 0. Iwvigata ; gradually increasing in density from base to apex ; 

 near the latter there are 10 in the space of 10 millimetres, near 

 the base there are only from 5 to 6 in the same space. It is 

 evident that the riblets were minutely granulated as the upper 

 nblets still preserve this character, together with fine vertical 

 striae in the interspaces. In the lateral channels the riblets 

 bend abruptly towards apex, and become interrupted and 

 alternate at junction with the riblets of the succeeding face, 

 kides gently sloping inwards near basal margins. 



Length of perfect specimen, 5| inches ; greatest diameter, 

 49 millimetres by 37 millimetres. 



B 



