128 CEETACEOUS PELECYPODA 



sinus is in the fossil form smaller than in any recent species of that group which I 

 have examined. 



Locality. — Odium, in a brownish earthy limestone. 



Formation. — Ootatoor group. 



\ / 6. Tellina [Arcopagia] discites, Stoliczha, PL IV, 'Fig. 15. 



Tell, testa subdisooidea, parviila^ solidula, concentrice minute striata^ cequilaterali, 

 antice ac postice rotundata., marginibus superioribus ad apicem anguliim 116° 

 forniantibus ; dentibus cai'dinalibus in valva dextra distinctis. 



A small species, but very distinct from any of the other cretaceous Tellince ; 

 the disciform almost quite equilateral shape and the strong development of the 

 lateral teeth entirely agrees with the sub-genus Arcopagia. It is not very probable 

 that the specimen figured is a very young shell, for it is of rather a solid structure. 

 The upper sloping lateral margins form an angle of about 116 degrees, the anterior 

 and posterior ends being both rounded. 



Locality. — Moraviatoor, in a dark-brown earthy limestone. 



Formation. — Ootatoor group. 



v/ 7. Tellina [Tellinides] adpressa, Stolichza, PI. IV, Eig. 14. 



Tell, testa ovato-elongata, pertenui, valde compressa^ fere cequilaterali^ ad 

 utramque extremitatem late rotundata ; umbonibus paulvdum promiMulis, marginibus 

 superioribus parumper descendentibus ; superficie minutissime concentrice striata. 

 Gardo in valva dextra dentibus duobus cardinalibus, anteriore bifido instructus ; 

 dente laterali antico distincto, postico fere obsoleto. Altitudo : longit.=0'68. 



This is a remarkably compressed and very thin shell ; it is almost equilateral, 

 equally broadly rounded at both ends, and there is no trace of a posterior ridge 

 observable; the upper margins are very little descending, the beaks being 

 minute ; the surface is covered with very fine and numerous concentric strige. The 

 hinge of the right valve is composed of two cardinal teeth, of which the anterior 

 one is bifid ; the anterior lateral is distinct, but the posterior almost obsolete (it is 

 too strongly represented in fig. 145). The proportion of height to length is 0'68. 



Var. — altitudine testce : longit. 0*60, pi. xvi, fig. 25 ; testa margine inferiori 

 ad medium parumper insinuato instructa. 



This form appears to be only a variety of the former, at least the only speci- 

 men found at present does not allow of any better conclusion. The shell is slightly 

 more elongated, and the upper margin slopes under an angle of about 142 degrees ; 

 structure and striation of the surface is equally fine and quite similar to the former. 

 There is a very shallow^ conspicuous depression running from the beak to the inferior 

 margin, and this very much resembles some FsammotcEce, and is the principal 

 character which gives the shell a somewhat different aspect from the one above 



