1867.] the Western Himalaya and Afghan Mountains. 203 



variety, remarkable for a pretty considerable number of tubular 

 spines, and by the large size of its longitudinal striae, which are 

 often well marked. 



Four specimens of a small species which differs from the P. 

 Longispinus or lobatus by the want of lobes and of a sinus on 

 the middle of the greater valve. It is perhaps the P. Aculeatus, 

 (Martin), but the specimens are not good enough to be determined 

 rigorously. 



Very small specimens of Productus which are perhaps the young 

 of the P. lontjispinus or of P. Boliviensis, (D'Orbigny), of which 

 Kcyserling found a valve in the carboniferous limestone of the 

 basin of the Petchora (government of Archangel). It is characterised 

 by well detached ears. 



Two specimens of Athyris, without the test and too imperfect to 

 allow of their being determined (Terebratula Subtilita, llalls?) 



Four specimens of a species of Athyris which is perhaps new. It 

 belongs to the class of Tvrcbrattdac with concentric strite and internal 

 spires, called by D'Orbigny Spirigera and by M'Coy Athyris (a name, 

 let us remark, which means the reverse of what exists, since, instead of 

 being imperforate, these species have a round hole on the beak). 

 This species from Kashmir approaches the A, Aml/yua, (Sowerby), and 

 the A. GJohulosa, (Phoill.), but it is more transverse and the beak is 

 more detached and sharper. It may be called A. Buddhista, as proposed 

 by Mr. Verchere. The A. Amhigua is found in Russia in the carboni- 

 ferous limestone, but is rare there, whilst it is common in England. 



Two specimens, of which one is perhaps a variety of the T. Subti- 

 lita, (Hall*) or the T. Subtilita itself. The other appears to me to be 

 an Athyris Boyssii, (Vernueil), discovered by myself in the carbonifer- 

 ous limestone of Belgium. When this species is well preserved, the 

 shell is seen to be covered by a pilose investment or coating, consisting 

 of very fine spines continuing the lines of growth. The specimen I 

 possess presents traces of this structure in the shape of a pubescence 

 of very fine hairs. 



Three specimens in a bad state of preservation, which are probably 

 merely varieties of the A. Roysii. 



* The Terebratula Subtilita is a species of Hall, found in the carboniferous 

 of the Great Salt Lake in America. Mr. Davidson mentions it from India. 



