410 MR. G. C. CRICK ON CARBONIFEROUS CEPHALOPODA [Aug. I9II, 



conoidal and depressed, 49 mm. long, with an elliptical cross- 

 section, of which the diameters at the anterior end measure 35 and 

 25 mm. respectively. The siphuncle, seen at the posterior end of 

 the specimen, is at about a third of the shorter diameter from 

 the surface. The fossil tapers rather rapidly, the sides being 

 apparently continuous with the basal surface. The test is rather 

 thick, ornamented with slightly waved, somewhat irregular, 

 upwardly-imbricating lines, which are very close together (three or 

 four in the space of 1 mm.) on the posterior part of the specimen, 

 their distance apart gradually increasing to about 1*5 mm. on the 

 anterior part of the fossil. 



The type-specimen came from High-Green Wood, near Hebden 

 Bridge (Yorkshire), and is preserved in the Manchester Museum. 

 Through the kindness of Dr. Wheelton Hind, the writer has had an 

 opportunity of examining a very similar specimen from the Pendle- 

 side Series of Hebden Bridge. Mr. Bolton records it from the Lower 

 Coal-Measures of Lancashire. 1 



Locality. — Pinhoe brickfield, near Exeter. 



Orthoceras sp. a. 



A small fragment from the Pinhoe brickfield seems to belong to 

 this genus. It is exposed in counterpart on the split surfaces of 

 part of a nodule, on one surface being displayed the internal cast 

 of the shell, and on the other the inner side of the test ; but the 

 boundaries of the shell are not shown. The shell is slightly curved, 

 and ornamented with regular transverse, rounded, equidistant 

 ridges. The fragment, which is 21 mm. long and about 13 mm. 

 wide at its widest part, bears fourteen ridges, the two last, probably 

 the hindermost, being much narrower than the rest. Although the 

 surface of the test cannot be seen, judging from its internal aspect 

 the ridges appear to have been rounded and neither forwardly- 

 imbricating as in Orthoceras obtusum, which occurs at the same 

 place, nor so fine as the ornamentation of the specimen from Pope 

 house Close, near Christow, mentioned below. 



Locality. — Pinhoe brickfield, near Exeter. 



Orthoceras sp. (3. 



Another species is represented by a flattened fragment, preserved 

 in counterpart on the split surfaces of a small slab from Popehouse 

 Close, near Christow. The fossil is about 28 mm. long, 15 mm. 

 and 11*5 mm. wide at the anterior and posterior ends respectively, 

 and ornamented with very fine, transverse, raised lines, which are 

 much finer than those of the example from Pinhoe, five of them 

 occupying a space of 2 mm. 



Locality. — Popehouse Close, near Christow. 



1 Trans. Manchester G-eol. Soc. vol. xxviii, pt. 14 (1904) p. 413. 



