G. C. Crick — Stracliei/s Cephalopoda from Himalaya. 69 



from the preceding by the fasciculate character of the ribs in adult 

 specimens, young shells of the two species being undistinguishable." 



Two specimens are represented on pi. xiii. Figs, la, h are the 

 lateral and front views (reversed and somewhat restored) of the 

 specimen in the British Museum collection bearing the register 

 number C. 5042. This fossil was transferred from the Museum of 

 Practical Geology, but there is neither one of that Museum's labels 

 nor any other original label with it, nor can I see any numbers 

 written upon the fossil. But its agreement with Blanford's figure 

 cannot be doubted for a moment. The author gave no dimensions 

 of the fossil. The measurements are: — diameter of shell, 85 mm.; 

 height of outer whorl, 28 mm. ; thickness of outer whorl, 31 mm. ; 

 width of umbilicus, 37-5 mm. The sutures are not shown. 



Fig. Ic has been drawn from a guttapercha cast of a natural 

 mould ; both the cast and the natural mould are in the national 

 collection [Nos. C. 5031 and 5031a]. They were transferred from 

 the Museum of Practical Geology, and are accompanied by one of 

 that Museum's labels as follows: — " Oolitic : Niti Pass. Ammonites 

 biplex (Sow.). Coll. by Col. Strachey." This was written in ink, 

 but the word " biplex " has been crossed out in pencil, and above it 

 has been written in pencil the name " triplicatus." The fossil is 

 clearly the original of Blanford's figure, but this represents only 

 a part of the specimen, and has been somewhat restored. 



9. Ammonites toequatus, J. de C. Sowerby. 



(H. F. Blanford, in J. W. Salter & H. F. Blanford: Palaout. Niti, 1865, p. 80, 



uo fig.) 



Professor Blanford's observations on this species are as follows : — 



" The only character by which I can distinguish this species from 

 A. biplex, Sow., are : — Its thicker and more depressed whorls, and 

 a slight notching of the ribs above the siphuncle. These characters 

 are exhibited by the typical Cutch specimens, as well as by those in 

 •Colonel Strachey's cabinet, and also by the specimens described and 

 figured by me, in the Spiti collection ot Di*. Gerard. The distinctness 

 of the notching and the depression of the whorls vary, however, in 

 different specimens, and a more extensive comparison is requisite to 

 decide whether A. torqiiatus be really distinct from A. biplex. 



" Mr. Sowerby, in his description of the figured specimens from 

 Cutch, states that they are distinct from * a Himalayan species,' in 

 liaving an ' incurved inner margin.' On comparison of the speci- 

 mens, I can, however, detect no such difi"erence, nor, indeed, any 

 other than that the Himalayan specimens have uniformly more 

 numerous (about 55) ribs than those from Cutch, which have 

 about 45." 



Among the specimens which were transferred from the Museum 

 of Practical Geology as the Strachey Collection there are four 

 •examples [Nos. C. 7676a-d] labelled " Oolitic : Niti Pass. Ammonites 

 torquatus (Sow.). Coll. by Col. Strachey " ; of these, three have the 

 broad whorls characteristic of A. torquatus, whilst the fourth has 

 somewhat more compressed and more finely ornamented whorls 



