126 CEETACEOUS PELECYPODA 



y 3. Tellina [ ? Peeon^oderma] scitulina, Stoliczka, PL IV, Pigs. 10-13, and 



PL XVI, Pig. 30. 



TelL elongata^ moderate compi^essa, crassiiiscula, incEquilaterali, parte antica (?) 

 breviori, ad maj^ginem rotundata, parte postica prodiicta et attenuata, sub-a/ngiilata, 

 plicatura hand dlstincta ; inarginihiis superioribiis fere rectis^ declivis, angulmn 130° 

 formantibus ; margine inferiori convexiusculo^ superficie striis distantibus^ lamel- 

 losis^ crassiusculis seu corrugatis ornata. Car do dtiobus dentibus cardinalibus 

 ac later alibus in utraque valva instructus. 



Shell elongated, moderately compressed, more than one-third longer than 

 high, marked with distant lamellar or rugose concentric striae; beaks promi- 

 nent, superior declivities meeting with an angle of 130 degrees; the anterior 

 side shorter, broadly rounded; posterior somewhat produced and attenuated, 

 hardly flexuous, inferior margin almost evenly convex. The hinge has two cardinal 

 and two lateral teeth in each valve, the posterior cardinal in the left and the 

 anterior in the right are stronger than their respective anterior and posterior ; the 

 laterals of the left valve are considerably smaller than those of the right one, but 

 quite distinctly traceable ; they are elongated, thin, marginal. — The somewhat solid 

 structure of the shell as compared to its size, and the peculiar apparently rough 

 striation, readily distinguish this species from any other known. In form it closely 

 resembles the Gosau Tell, StoUczkana, but all our specimens are considerably longer 

 in proportion to the height : — figure 10 on pi. v is in that respect somewhat incor- 

 rect, and a second representation of the same specimen is given on pi. xvi, fig. 30. 

 The posterior plicature is indistinct. As to form the shell bears a great resem- 

 blance to a Mcera^ but I could not satisfactorily prove that the shorter side is the 

 posterior ; to all appearance the shorter side seems in our shell to be the anterior 

 one, at least there is in one specimen (fig. 10a, pi. v,) a small ridge behind the 

 umbones which can only be explained as a fulcrum ; I have not been able, however^ 

 to see the pallial sinus. 



Locality, — ComarapoUiam, in a light coloured sandstone. 



Formation, — Arrialoor group. 



^/ 4. Tellina [Tellinides] primula, Stoliczka, PL V, Pig. 1. 



Testa ovata, fere cequilaterali^ temiissima, valde compressa, antice rotundata, 

 postice obtuse ac late truncata^ jugo pauhdum elevato ab umbonibus ad marginem 

 posterO'inferiorem decurrente instructa ; marglnibus superioribus pauhtlum declivis, 

 lente curvatis, margine inferiori convexo, postice vix flexuoso ; superficie st7nis 

 cequalibus, subtilissimis concentricis induta, Cardo in valva dextra duobiis dentibus 

 cardinalibus distinctis et uno postico laterali instructus, dente laterali antico fere 

 obsoleto. 



Shell oval, nearly equilateral (the posterior part very little shorter than 

 the anterior), about one-third longer than high, very thin and compressed; the 



