Bihliograi>hical Xotice. 3G7 



Page 



Oppelia (Streblites) n. sp. indet. a£F. Lvmani, Oppcl ... oG 



„ „ punctotopicta, sp. dov 59 



„ „ Bphenodoma, sp. nov 58 



„ ,, platydoaia, sp. nor 60 



„ „ leptodoina, sp. nov 58 



,, „ domocrenata, sp. nov 64 



„ „ pygina^a, sp. nov 65 



,, „ adanata. sp. nov 63 



„ ,, sp. nov. indet 67 



The Adolphi group are closely connected with the European 

 Tenuilohata by their concordance of the lobal structure, ornamenta- 

 tion, external shape of the test, development of the carina, and the 

 form of the body-chamber. 



II. Group of Oppelia acucincta {Opfelia, sensu stricto), represented by only 

 one species: Oppelia acucincta, Sti'achey, sp. (p. 40). 



III. Group of Oppelia nivalis {Neumayria, Bayle), represented by only one 

 species : Oppelia {Neumayria) nivalis, Stoliczka, sp. (p. 41). 



IV. Group of Oppelia {(Ecotraustes) adela, represented by only one species: 

 Oppelia (CEcofrausfes) adela, sp. nov. (p. 41). 



In comparing the Spiti Tenuilohata with the European, Dr. Uhlig 

 finds (pp. 37-38) that the former group had multifarious ramifica- 

 tions very partially known to us, while in Europe the group is also 

 manifold, but more closely knit, and there are some analogies and 

 some divergent characters ; these two geographically distinct series 

 do not appear to have followed a similar and quite parallel course 

 of evolution, but were affected " by partial and provincial tendencies 

 to mutation, and admitted, even along the same lines of mutation, 

 of the development of vicarial forms (as, for example, 0pp. indopicta 

 and Frotho)." It is not necessary to ask for a laud-barrier to 

 account for this isolation, for a wide range of ocean may well be 

 occupied by various and diiferent creatures. It is thought possible, 

 however, that one at least of the Cutch (Katrol) Ammonites (Op)p. 

 plicodiscus, Waagner) might serve as an intermediate. 



Eollowing the genus Oppelia comes the genus Aspidoceras, 

 Zittel (pp. 74, 75), represented hy Asp) id ocer as avellaaoides, sp.nov., 

 founded on a specimen regarded by Stoliczka, in 1865, as Ammonites 

 liparus, Oppel, and proved on re-examination to be Aspidoceras of 

 the I n^ati group Physoderoceras, Hyatt). 



The genus HoJostcpJianus, Neumayr, is recorded next to Aspido- 

 ceras in order (page 77). In external form it has a thick and costate 

 shell, tuberculate along the umbilical border. It is divisible into 

 several groups, one of which has a single representative in the 

 Spiti Shales (//. SchenJci), while the other groups " exhibit an un- 

 exampled variety of forms." The alliances of some of these have 

 been very differently regarded by different writers. Taking Rolo- 

 stqihanus spitiensis (lilanford) as the type of a new subgenus 

 (S2nticeras, pp. 77 & 82), Dr. Uhlig describes it carefully, and 

 defines its species in the following order : — 



