G. C. Crick — Pericyclm fasciculcdus, M'Coy. 2& 



M'Coy gives only two measurements of his G. fasciculatus, viz., 

 diameter one inch six lines [= 38 mm.], and thickness of last whorl 

 eleven lines [=23-5 mm.], but according to Dr. Foord's figure of 

 the type - specimen the other dimensions are: — radius,^ 22-5 mm. • 

 v^ridth of umbilicus, 11 mm. ; and height of last whorl, 17 mm. 

 The dimensions offurcatus, examples of which are, he says, generally 

 elliptical, M'Coy states to be as follows : — diameter, two inches 

 seven lines [655 mm.] ; diameter [or height] of last whorl, thirteen 

 lines [27-5 mm.] ; thickness, eleven lines [23*5 ram.]. 



Fig. 1. — Suture-line of Fericyclus fasciculatus. Drawn of the natural size from 

 a specimen in the British Museum [No. C. 5933] from the Carboniferous 

 Limestone, Clane, co. Kildare, Ireland. In this and the foUowiug figau-es the 

 short dotted lines crossing the sirture-line indicate the position of the 

 umbilical margin, the short line at each end marking the position of the 

 suture of the shell, or ' line of involution.' 



In his Monograph Dr. Foord gives no dimensions of the species, 

 but figures four examples. Of these one (pi. xxxvii, figs. 2a, h) is 

 the undistorted specimen from Clane belonging to the British 

 Museum and referred to below ; another is M'Coy's type of 

 fasciculatus (pi. xxxvii, figs. 5a, h), the dimensions of which are 

 given above ; a third is a somewhat distorted example from 

 Midleton, in the county of Cork; whilst the fourth is a smaller 

 specimen from Glenbane East, in the county of Limerick. For the 

 sake of comparison with the English examples recorded below the 

 dimensions of the third and fourth specimens are here given. The 

 measurements of the Midleton specimen are : — diameter, 65 mm. ; 

 radius, 4:0 mm.; width of umbilicus, 21*5 mm. ; height of outer 

 whorl, 28-5 mm. ; thickness of outer whorl, 35-5 mm. : those of the 

 example from Glenbane being :— diameter, 34 mm. ; radius, 20 mm.; 

 width of umbilicus, 10 mm.; height of outer whorl, 14-5 mm. ; 

 thickness of outer whorl, 21*5 mm. 



In Ireland, according to Dr. Foord (op. cit., pt. iv, 1901, p. 138), 

 the species occurs at Cork, Midleton, Blackrock, in the county of 

 Cork ; Glenbane, in the county of Limerick ; and Clane, county of 

 Kildare. The species, however, is rare in England ; hence the 

 following particulars respecting English examples which have come 

 under the writer's notice may not be without interest. In the list of 

 fossils appended to the Geological Survey memoir on " The Geology 

 of the Carboniferous Limestone, Yoredale Kocks, and Millstone Grit 

 of North Derbyshire," 1887, the species is recorded from North 

 Staffordshire (p. 182), the specimen referred to being from Beeston 

 Tor, in North Staffordshire, about 1 mile east of Grindon, and now 

 preserved in the Museum of Practical Geology, Jermyn Street. 



Until comparatively recently the British Museum contained only 

 one example of this species [No. C. 5933] having the locality 



1 A line drawn from the centre of the coil to the periphery of the shell. 



