44 EAUNA OF BALUCHISTAN. 



Pectbn (Amusium) sp. 



A very ill preserved specimen proves at least the existence of this cl^arapterist}^? 

 type in the cretaceous deposits of Baluchistan. 



Locality and stratigraphioal position. — D^s VaUey, horizon 8. 



4, Family: MTTJUDM 



Genus: MODIOLA, Lamark, 



MoDiojiA. sp. PI. S. fig. 5. 



A small shell measuring 82 mm. in length and 20 mm. in height probably 

 belongs to this gerjus ; it is equivalve but very inequilateral, the small depressed 

 beaks being quite close to the anterior margin ; anterior side short, posterior side 

 elongated and a little expanded. Valves inflated ; a shallow furrow runs from the 

 umbo to the posterior end of the straight central margin, thereby slightly cutting 

 out the latter. The oi*namentation consists of numerous rather coarse concentric 

 striae of growth, the interstices of which are filled by very delicate, but somewhat 

 irregular, radiating stripe. 



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



Bemarks. — By its ornamentation this species seems to be related to Mytilu^ 

 striatocostatus, d'Orb., but it is impossible to say anything further, owing to the bad 

 state of preservation of the specimen froni Baluchist4n, which does not admit pvei^ 

 of the sjiape of the shell being correctly described. 



MoDiOLA viSHNTJ, spec. nov. PI. XL fig. 3. 



The shell, which is tolerably large in size, being certainly not less than 8Q mn^. 

 in length and about 35 mm, in height, is rectangular in shape, slightly narrower ii^ 

 front than behii^d ; it is yery inequilateral, the a,nterior side being very short, the 

 posterior side elongated, but only slightly expanded. The beaks are low, depressed, 

 and quite close to the anterior piaygin. A broad but shallow depression runs from 

 the beak towards the central miargin, which is thereby slightly indented. Posteriorly 

 the depression is limited by a broad obtuse ridge, on the posterior side of which 

 the surface slopes more steeply than on the anterior. The orpamentation consists 

 of somewhat irrpg]ilar conpentric striae qf growth, which are very fine behind the 

 ridge, but rather strongly marked just in front of it and of the depression ; besides 

 the concentric stri^ of growth, there are some yery ^ne, closely set, regular, radi- 

 ating lines, which are limited to the anterior side of the ridge onlv, where they form 

 a bundle, gradually extending in brea4th fyom the beak towards the central mar»ii}. 



Locality and stratigraphical position. — D^s valley, hori^oii 2. . 



Bemarks. — The closest relation to thjs form is Modiola typica, Fqrbes, from 

 Southern India, a species which exhibits the same bundle of thin radiating stride 



