68 G. C. Crick — Strachei/'s Cephalopoda from Himalaya. 



of the whorls being probably at least half as much again as tbey are 

 represented, while from each tubercle springs a bundle of 4 or 5- 

 ribs, which cross the ventral region with a slight convex curve 

 towards the mouth." 



Owing to the imperfection of the external part of the outer whorl 

 it is impossible to give accurate dimensions of the specimen. 



This species was first described in 1863 by Professor Blanford/ 

 who regarded Oppel's Ammonites Cautleyi ^ as a synonym.^ 



7. Ammonites biplex, J. Sowerbj'. 



(H. F. Blanford, iu J. ^\ . Salter & H. F. Blanford : Tahcout. Niti, 1865, p. 79,. 

 pi. XI, tigs. \a-c ; pi. xii, tig's. l«-c.) 



Professor Blanford says : — " Two specimens of this Ammonite 

 occur in the collection, together with some impressions of the shell 

 on black siliceous nodules. I can detect no difference between them 

 and the characteristic Oxford clay specimens of Europe. They are 

 identical also in all respects (mineral character included) with those- 

 from Spiti, lately described by myself, from Dr. Gerard's collection." 



From the Museum of Practical Geology were transferred two 

 specimens [Nos. C. 5033 and C. 5034] belonging to the Strachey 

 Collection, labelled, with one of that Museum's labels, " Oolitic. Niti 

 Pass. Ammonites biplex. Coll. by Col. Strachey " ; and two frag- 

 ments [Nos. C. 7683a, 6] accompanied by a label, " A. biplex. 

 Spiti Shales," but it is not recorded how these were obtained. 



To one of the two Strachey specimens [No. C. 5033] is attached 

 another M.P.G. label, on which is written in ink simply the name 

 "Ammonites biplex." This is evidently the original of pi. xi, 

 fig. la, the figure being reversed and considerably restored ; it& 

 anterior end, however, does not exhibit a septal surface such as is 

 shown in fig. 16, nor is its suture-line visible ; it cannot, therefore, 

 have formed the originals of the figures \b, c. Nor are these 

 characters displayed on the other specimen [C. 5034] in the Strachey 

 Collection. This is numbered in ink " 1032a," and it also bears a small 

 square white label, originally bearing the number " 24," but this has 

 been crossed out and the number " 1032a " substituted. There i& 

 no specimen in the collection agreeing with figs, la-c of pi. xii. 

 Perhaps fig. la is in part a restoration of the example No. C. 5034, 

 but this is far from certain. 



The larger of the two fragments from the " Spiti Shales " exhibits^ 

 the suture-line somewhat indistinctly, but I do not think it could 

 have furnished the drawing of the suture-line given either in pi. xi, 

 fig. Ic or pi. xii, fig. Ic. 



8. Ammonites triplicates, J. Sowerby. 



(H. F. Blanford, iu J. W. Salter & H. F. Blanford : Palaeout. Niti, I860, p. 80, 

 pi. xiii, figs, la-c.) 



Professor Blanford says : — " This Ammonite is only distinguished 



1 Journ. As. Soc. Bengal, vol. xxxii. No. 2 (1863), p. 131, pi. iv, figs. 1, Iff, lb. 

 According to F. Stoliczka, the type-specimen "is deposited iu the Asiatic Society's- 

 follectiou, Calcutta" (Mem. Geol. Sui-v. India, vol. v, 1866, p. 104, footnote). 



2 Pal. Mittheil., iv (1863), p. 279, pi. ixxviii, tigs. Iff, b, 2ft, b. 

 a Palffiout. Niti, ISef), p. 106. 



