408 



DR F. A. BATHER. 





G23. 



G26. 



G267. 



G42. 



G25. 



G45. 



Width of theca from toe to marginal 2 



15-2 



17-7 



20^6 



21 



29-7 



38-5 



Width of leg at same level 



41 



7 



6-7 



6^9 



1L5 



93 



Height from stem to top of strut 



8 



7-1 



8^5 



7-8 



16-8 



14 5 



Height from stem to top of leg . 



15 



12-5 



15 



16-3 



30 



ca. 24 



Stem, proximal region : 















Length ...... 





3 



1 



4 



7^8 



5-9 



Width 





2-5 



? 



3 



4-7 



5-8 



Stem, median region : 















Length ...... 





2-2 



LB 



2^2 



3 





Width above ..... 





1-6 



L9 



2-4 



2^9 





Width below ..... 





•9 



LI 



LI 



L7 





Stem, distal region : 















Length . . . . . 





15 + 



26^5 



20 + 



19 + 





Width below ..... 





1 



•3 



•7 



11 





Stem, heights of columnals . . . < 





•65 

 •32 



•5 

 •35 



•75 

 •5 



•7 

 •53 





Comparison with C. curuata. — See § 222. 





ttii 





Cothurnocystis curvata n. sp. 

 (PI. IV. figs. 39-45. Text-figs. 24-28.) 



§208. Diagnosis. — A Cothurnocystis with outline of frame junk-shaped; with 

 integumentary plates normally prominent and imbricate ; with subvective grooves 

 elongate, having diameters as 1 : 10, and occupying an area that stretches from stem to 

 toe- point at a distance from the angle of the sole. 



§ 209. Locality. — Thraive Glen, Grirvan. 



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



§ 211. Material. — Seven specimens in Mrs Gray's collection, numbered Gl, G2, 

 G5, Gl5, G24, G33, G38. All are imprints, with counterparts. G2 is taken as 

 holotype. 



Some of the imperfect specimens provisionally associated with C. Elizae may belong 

 to this species (§ 173). 



§ 212. Description. — The Thecal Frame is incomplete in G24 and G38, but its 

 outline seems to agree with that in the other specimens. The term "junk-shaped" 

 used in the diagnosis implies that the leg of the boot is reduced and cut off obliquely, 

 so that the toe-half and the leg-half of the boot are more equal in size than in C. Elizae ; 

 further, that the sole is extended at the ball of the foot in a thickened angle correspond- 

 ing to the heel. Indeed, in G2, G5, and G33, if not in G] also, the heel is far less 

 prominent, so that, as regards outline, the heel and ball of the foot are the converse of 

 those in C. Elizae. Correlated with the outward curve of the heel and leg, the strut, 

 instead of ascending at right angles to the sole, slopes in the direction of the leg (G2, 

 G5, G33, and G38 ; PI. IV. figs. 40, 43). 



