404 MR. G. C. CRICK ON CARBONIFEROUS CEPHALOPODA [Aug. I91I, 



together, producing a strong rounded ridge along the middle of the 

 lateral area. There are traces of the suture-lines. 



The fragment of the outer whorl comprises about an eighth 

 of a volution, increasing near the umbilical margin to nearly a 

 quarter of a volution. It is sublanceolate in cross-section, 48 mm. 

 high, and about 38 mm. wide at the umbilical margin. It shows 

 the faint strongly-curved growth-lines and the prominent umbilical 

 margin of the species, but the ridge on the middle of the lateral 

 area is here almost obsolete. Since this portion reveals no traces 

 of the suture-lines, it seems to have formed part of the body- 

 chamber. 



This imperfect example indicates a fossil larger than the type- 

 specimen, for in the latter with a diameter of 60 mm. the outer 

 whorl was only 27 mm. high. 



Prof. Haug (loc. supra cit.) regards the species as either a senile 

 form or a variety of Ghjphioceras reticulatum. 



The type-specimen was obtained from the late James W. Davis, 

 of Halifax, and is recorded as being from that locality ; but 

 Dr. Smith Woodward told the present writer that the collection of 

 fossils of which it formed a part really came from Hebden Bridge. 



Dr. Hind & Mr. Howe record the species from the Pendleside 

 Series of the Midlands, and indicate that it passes upwards into the 

 Grits and the Lower Coal-Measures. 1 



Locality. — Mincing Lake. 2 



Olyphioceras incoxstans (J. Phillips). 



1841. Goniatites iuconstcms J. Phillips, ' Palaeoz. Foss. Cornwall, Devon, & 

 West Somerset ' p. 123 & pi. li, figs. 238 «-238 e. 



A distorted example in the Exeter Museum [No. 6834], of which 

 the locality is unrecorded, seems to be referable to this species, but 

 the main ribs in passing from the edge of the umbilicus are more 

 forwardly-inclined than they are represented to be in Phillips's 

 figures ; the ornaments form a distinct orad-concave curve on the 

 periphery. 



This species greatly resembles young forms of Glyphioceras 

 reticulatum. a species to which it evidently is closely allied, for, 

 according to Phillips, it passed through a series of forms parallel 

 to those described by him in regard to Gl. reticulatum, with which 

 species he at first believed it to be identical ; but, compared with 

 that species, he pointed out {pp. cit. p. 124) that 



' the umbilicus is here larger, the ridges on the inner edge of the whorls are 

 continued into the cavity, and the back [periphery] is in all corresponding 

 ages broader, and in the young state more cariniform in the middle.' 



Embedded in a piece of shale from ' under Stoke Wood,' and 

 containing a specimen here referred to Gl. reticulatum, there is 



1 Q. J. G. S. vol. lvii (1901) App. B, table facing p. 402. 



2 [Since the paper was read Mr. Collins has found in the Pinhoe brickfield a 

 much better example of this species, showing the beautifully-ornamented test. — 

 G. C. C, August 5th, 1911.] 



