442 



DR F. A. BATHER. 



N. America. 



Britain. 



N.-W. Europe. 



Bohemia. 





G. constridus 









G. interruptus 



[C. interruptus] 





G. Walcotti 







G. alter 



G. anatiformis 









G. Logani et var. 









gracilis 









[G. angulatus] 





C. granulatus 

 G. degener 

 G. Leuchtenbergi 

 G. nodosus 

 G. Volborthi 

 G. penniger 

 G. striatus 

 G. insignis 

 G. ornatus 

 G. sculptus 

 G. atavus 

 G. radiatus 

 G. giganteus 





G. Forbesi 









§ 309. Fragments assigned to the genus, but not specifically determinable, have 

 been recorded from other parts of the British Isles (e.g. F. R. C. Reed, 1899, p. 723 ; 

 also Acanthalepis Jamesi M'Coy), and from the Naungkangyi beds of the Shan States 

 of Burma (F. R. C. Reed, 1906). Doubtful plates from Girvan are mentioned in § 4. 



The genus therefore existed throughout the greater part of the Ordovician Epoch, 

 and was distributed over the whole Northern Hemisphere. 



Cheirocrinus constridus n. sp. 

 (PI. IV. figs. 49-56. Text-figs. 48-58.) 



§ 310. Diagnosis. — A Cheirocrinus with base invaginate and theca constricted 

 towards top of Circlet III.; with no plate 18a; with pectinirhombs all conjunct, and 

 only 1-5, 10-14, 13-18, 15-16, 16-17, 17-18, 18-19, developed; ornament of single 

 axial ridges, faint radiate granulation, and very faint concentric folds ; columnals of 

 median (and ? distal) region with fine vertical ridges. 



§ 311. Locality. — Thraive Glen, Girvan. 



§ 312. Horizon. — The Starfish Bed in the Drummuck Group (§ 6). 



§313. Material. — Fifty-one specimens, all in Mrs Gray's collection. Gl57 is 

 taken as holotype. 



The following, definitely referred to this species, are paratypes : Gl33, Gl34, 

 G136-G138, G140, Gl41, Gl43, G145-G158, Gl60, Gl61, G163-G169, G176, 

 G178, G179, G187, G188, G222, G226, G227, G260, G261. 



Except for a few isolated plates, all are in the form of either imprints or internal 



