-H' 



118 CEETACEOUS PELECYPODA 



reference to a left valve is to that figured by d'Orbigny (Pal. Eran5.5 foss. cret., iii^ 

 pi. 378, fig. 5) ; in such a case, however, it ought to have been stated, for it is a 

 very great difference to draw up a characteristic from the actual specimen or from 

 a figure without consulting its original, but Mr. Conrad seems at such occasions 

 often to indulge in the mysterious; my characteristic quoted above has been 

 taken from very well preserved specimens of both valves of Tell, costulata of 

 Goldf. and from our own Indian forms. 



Sg, Fhylloda^ Schuhmacher, 1817. Shell oblong, much compressed, pos- 

 terior side carinated ; hinge with the primary teeth divergent, lamellar ; one lateral 

 tooth in the right valve only. Type Tell, foliacea, Linn. 



SJi, Angulus, Miihlf., 1811, {Tellinula, Ohem., Fahulina, Gray). This 

 includes a number of small, thin, smoothish shells (like T. fahula, Gmelin, or 

 T, juvenilis oi Hanley), sub-orbicular, or elongated, with a posterior plicature; 

 the cardinal teeth are small; of the laterals there is usually only one (the 

 anterior, rarely the posterior) in the right valve well developed, the other is mostly 

 obsolete. This section of Tellince is sometimes determined with very great diffi- 

 culty : some of the species greatly resembling small Macomce ; and perhaps Macoma 

 ought to range only as a sub-genus here or near Feroncea. 



8i. Tellinimera, Conrad, 1860, (Jour. Acad., Phil., 2nd ser., iv, p. 278). 

 The author describes two species, T limatula and ehorea^ under this name : they 

 both have an elongated sub-trigonal form, and the shells are said to be thin. Of 

 the former species a right valve is described, possessing " three cardinal teeth, the 

 shortest one extending to the apex." Of the latter a left valve appears to be 

 figured ; the shell is said to have the anterior cardinal tooth slightly oblique. No 

 lateral teeth are said to occur in the former, and no mention is made of their 

 existence in the latter. The shells resemble Angulus a great deal, but the present 

 characteristic appears insufficient to compare Tellinimera with any of the other 

 sub-genera of Tellina, 



Sk. Tellinides, Lamarck, 1818. Shell transverse, posterior part somewhat 

 attenuated and truncated at the end ; hinge with one approximate lateral tooth. 

 Type T, timorensis, Lam. 



Tellinites, Schloth., 1820, This name has been in use by various authors 

 since nearly two centuries ago, but Schlotheim reserved it for certain fossil, 

 especially palceo- and meso-zoic species of Tellince, and similar shells. The 

 definition is uncertain, for I am not aware that in any of the species the hinge 

 had been examined. McCoy (Brit. Pal. Eoss., p. 286,) refers to it a species, 

 T. affinis, which rather appear sto belong to the ^ozjEjfFZDj^ ; other species, how- 

 ever, have more the aspect of Tellince and still mp^^e th^t of Tellinomya. ^.:, 



81. Eomalina, Stoliczka, 1870, r-Sbm^/^,Wud''H. and A. Adams). Shell 

 elongated, anterior side short, broadly rounded, posterior prolonged, attenuated 

 with a more or less distinct marginal plicature, narrowly rounded posteriorly; 

 cardinal teeth small, one approximate lateral tooth in the right valve. T. trian- 

 gularis, Ohem,, is the type. This is a very characteristic section of Tellina^ 



