114 Dr. F. R. Gowper Reed— 



The fossils, which are scarce and mostly fragmentary, are in a 

 poor state of preservation, consisting either of crushed internal casts 

 or external impressions, with the shell sometimes retained as a 

 thin film. 



It was felt that a more detailed examination of the material , 

 than was given in 1900-1 might yield fuller and more definite 

 results, and Professor Hughes accordingly entrusted me in 1915 

 with the task, as the specimens had been deposited in the 

 Sedgwick Museum. A large number of fragments have been 

 carefully broken open or split, and by this means it has been 

 possible to augment to a considerable extent the list which 

 Professor Hughes gave in 1901, and to fix with more certainty 

 the stratigraphical position of the beds. The fauna proves to be 

 of peculiar interest, and in the almost total ignorance of the geology 

 of this district of Siam the following notes may be of value to 

 future investigators in these parts. 



Pronorites aff. cyclolohus (Phillips). (PI. II, Fig. 1.) 



The late Mr. G. C. Crick kindly examined for me the single specimen 

 of a cephalopod in the collection which shows a suture-line distinctly, 

 and he considered that the shell was referable to the genus Pronorites 

 and allied to the Carboniferous species Pr. cyclolohus (Phillips).^ 

 Our specimen shows about the last quarter of the outer whorl 

 and a portion of the body-chamber ; four suture-lines are preserved. 

 The more strongly marked horseshoe-shaped saddles and the blunter 

 or even rounded second lateral and accessory lobes, and the fact 

 that the first and second lateral saddles nearly touch respectively 

 those of the preceding suture-line and overlap the bases of the 

 preceding adjoining lobes, are features which distinguish it from 

 the typical Pr. cyclolohus. The whole shell when perfect must have 

 measured about 20-25 mm. in diameter. 



Prolecanites (?) sp. 



Some poor impressions of the exterior and some flattened 

 imperfect internal casts of a goniatite may perhaps be referable to 

 a species of the genus Prolecanites rather than to Pronorites, but the 

 reference is uncertain. The shell was apparently discoid and laterally 

 compressed with all the whorls (6-7) exposed in the wide, shallow, 

 open umbilicus. The overlapping of the whorls appears to have 

 been slight, but the outer whorl increases more rapidly in size than 

 the inner ones, and there are some traces of a more complicated 

 suture-fine than in Pronorites. Perhaps P. compressus (Sow.) ^ and 

 P. mixolohus (Phill.) ^ may be compared with it ; the latter is. 



1 Phillips, Geol. Yorkshire, 1836, pt. ii, p. 237, pi. xx, figs. 40-2. Foord 

 and Crick, Cat. Foss. Ceph. Brit. Mus., pt. iii, 1897, p. 264, text-fig. 125, p. 261. 



- Sowerby, Min. Conch., vol. i, 1813, p. 84, pi. xxxviii. Foord & Crick, 

 Cat. Foss. Ceph. Brit. Mus., pt. iii, 1897, p. 252, fig. 121. 



3 Phillips, Geol. Yorks, pt. ii, 1836, p. 236, pi. xx, fig. 43; Foord & Crick, 

 op. cit., p. 254. 



