PELECYPODA, 47 



they are generally somewhat less inflated, although it is difficult to say whether this 

 is a rule, since they are all moro or less damaged. Under these circumstances we 

 must suppose that d'Archiac's original came from the upper cretaceous beds of Sind. 



2. Family: CABBIID^. 

 Genus : CARDIUM, Linn^. 



Cabditjm loralaiekse, spec. nov. PI. XII. fig. 5-5A. 



The cordate shell is equivalve, but somewhat inequilateral ; anterior side broad 

 and rounded, posterior side short; beaks inflated, but depressed, closer to the anterior 

 than to the posterior margin. Valves inflated, sloping steeper in the anterior, than in 

 the posterior direction. The ornamentation consists of very regular, moderately broad 

 radiating ribs, which are separated by very narrow interstices. On the posterior 

 and anterior side the ribs are set with low tubercles, but whether the same takes 

 place in the central part of the valves cannot be ascertained owing to the bad state 

 of preservation ; to judge from a few pieces of the substance of the shell, they were 

 simply crossed by regular, closely set striae of growth. 



Locality and. stratigrapMoal position. — Mazdr Drik, horizon 8. 



Remarks. — None of the specimens are sufficiently well preserved to permit a 

 more detailed description at present. To judge from the ornamentation, Car' 

 dium loralaiense must be a close relation to Gardium moutonianum, d'Orb., which 

 differs however, by finer and stronger ribs alternating on the anterior side, and by 

 having the ribs on the central part of the valves covered with fine granules. 



Caedium harnaibnse, spec. nov. PI. XII. fig. 4i-4A. 



Although a single left valve only, and this partly imbedded in the matrix, has 

 come under examination, the peculiar ornamentation which it exhibits is sufficient 

 to recognize in it a new species. 



The general shape of the shell cannot be definitely ascertained, but it was un- 

 doubtedly cordiform, and somewhat higher than long. The ornamentation consists 

 of very regular, rather broad, radiating ribs, separated by interstices of the same 

 breadth. The ribs exhibit a roof-like section, with sharp ridges on the posterior 

 and anterior side, but on the central part of the shell the ridges become flattened 

 and their sides slightly concave. Each rib is accompanied by a very fine line run- 

 ning at either side along its basis on the central part of the shell, and a single line 

 along the posterior side of each rib on the posterior part of the shell. Numerous 

 closely set, concentric striae of growth produce a thorny appearance on the ribs 

 while the interstices become more or less foliaceous. 



Locality and stratigraphical position. — Maz^r Drik, horizon 8. 



Remarks. — The peculiar ornamentation as described above, distinguishes this 

 species readily from any other forms. 



