Vol. 6$.~] BASEMEXT-BEDS OF THE BRISTOL COALFIELD. 465 



Dr. A. H. Eoord, who kindly examined the specimen, sent me 

 the following note : — 



' The species to which it seems nearest allied appears to be 0. Martinianum, 

 de Kon., but in this the test is perfectly smooth. 0. cylindraceum, Fleming. 

 Ann. Phil. vol. v, 1815, pi. xxxi, fig. 3 (non Sow.), as in your shell has a very 

 slow rate of increase, about 1 in 10, and a surface minutely striated ; but your 

 shell has very regular, though faint, annulations — the conditions of preserva- 

 tion preventing any finer ornamentation from being seen, if such existed. 

 The position of the siphuncle practically agrees with that of Fleming's species.' 



Orthoceras cf. coxqxjestum, de Koninck. (PI. XXX, fig. 20.) 



Shell straight, except in the first third of its length, where it is 

 slightly curved, the curve being strongest near the apex. Annu- 

 lations strong in the apical, faint in the anterior portion of the shell. 

 The siphuncle is difficult to distinguish, but appears to be sub- 

 marginal and of large diameter for the size of the shell. The 

 test is ornamented along its whole length by a closely-set series 

 of fine, raised, transverse striae, which are coarser and wider apart 

 on the upper portion. 



Pleuroxautilus costatus, Hind. 



I have referred to this species a fragment of an outer whorl 

 showing three broad costal ribs, which arise on the edge of the 

 umbilicus and are separated by broad sulci, in which the shell- 

 ornament consists of very fine transverse lines — in this respect 

 agreeing with the type. The fragment of whorl preserved also 

 shows a strong tendency towards a quadrangular outline. 



Temxocheiltjs tuberculatum (J. Sowerby). 



A little more than half of the last whorl and a portion of the 

 body-chamber is shown. Almost the whole of the shell has 

 remained attached to the counterpart, leaving the septa well- 

 exposed. Where the outer shell is retained on the edge of the 

 umbilicus, there is evidence of three obtusely-conical tubercles. 

 Sufficient of the specimen is preserved to indicate that the umbilicus 

 was broad and very deep. 



Dr. A. H. Foord, who has examined the cephalopods and kindly 

 given me the benefit of his criticism, drew my attention to the next 

 species. 



Glyphioceras cf. xltidum (Phillips). (PI. XXX, fig. 21.) 



The same slab of shale as that which carries the fragment of an 

 outer whorl of TemnocJieilus tuberculatus also exhibits a small peri- 

 pheral portion of a Glyphioceras. The outer shell-layer has dis- 

 appeared, and thus seven suture-lines can be distinguished, which 

 agree closely with the suture-lines of Gl. nitidum. 



Glyphioceras diadema ? (H. E. Beyrich). 



Internal cast of a fragment of a perfectly-flat shell. Enough 

 remains to show that the original was discoidal, with a small and 

 shallow umbilicus, and whorls much higher than wide. The 



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