CARADOCIAN CYSTIDEA FROM GIRVAN. 519 



Plate IV. 



(All the specimens on this Plate are in Mrs Gray's Collection,) 



Cothurnocystis curvaia, §§ 208-222. 



Fig. 39. Holotype, G 2. Obverse face. Shows general shape of theca, with the fine rhomb-like sub- 

 vective system on the left. Compare text-fig. 25. Nat. size. 



Fig. 40. Holotype, G 2. Reverse face. Part of the integument is removed, exposing, near the toe, the 

 inner face of the subvective system. Cf. text-fig. 24. Nat. size. 



Fig. 41. G33. Reverse face. Here also part of the subvective system is exposed. Nat. size. 



Fig. 42. G 5. Obverse face. The rudimentary toe-spine is shown, but the division between the two 

 sides of it is not well seen in this view (§ 213). The character of the integument is well displayed (§ 217). 

 X 2 diam. 



Fig. 43. G 24. Reverse face, with the integument removed, exposing the inner face of the subvective 

 system. Cf. text-fig. 27. x 3 diam. 



Fig. 44. G 24. Obverse face, to show the appearance of the subvective system. Cf. text-fig. 26. 

 X 4 diam. 



Fig. 45. Gl. Obverse face. Shows lumen of proximal region of stem, and relations of dimeres; 

 cf. text-fig. 28. The position of the strut is indicated by the ridge in the integument. Cf. text-fig. 25. 

 X 2 diam. 



Cothurnocystis 1 sp., § 173. 



Fig. 47a, b [intended to be 46 and 47, but a mistake arose in lettering and proving the plate]. G 204. 

 A rather obscure specimen, which may represent part of a young Gothurnocysiis. a is a .squeeze ; b is the 

 actual specimen. Note the somewhat dice-box shape of the columnars in a, and the fluting of some, faintly 

 shown in b. x 2 diam. 



Cheirocrinus interruptus, §§ 336-347. 



Fig. 48. G 214. This photograph is interpreted in text-fig. 59. Br denotes the position of the 

 subvective grooves at the top of the radial plates. In the middle one are seen some brachioliferous 

 elements, x 2 diam. 



Cheirocrinus constrictus, §§ 310-335. 



Fig. 49. Holotype, G 157. Seen from the right side. P denotes the periproct. Nat. size. 



Fig. 50. G 143. Theca from left side. P = periproct. Nat. size 



Fig. 51. G133. The specimen is seen from the right posterior interradius, and shows deltoid 20, 

 brachioHferous elements with traces of brachioles surmounting radials 15 and 16 (§ 326), pectinirhomb 10- 

 14, plates 9 and 5 of Circlet II., basal 4, and a considerable part of the stem, x 2 diam. 



Fig. 52. G261. The tegmen from above. A denotes the anterior radius. Cf. text-figs. 51, 52, and 55 

 (§§ 323-326). X 3 diam. 



Fig. 53. G261. The same squeeze seen from the side, with radial 16 in the middle. In the hollow 

 behind it are traces of brachioles, also seen in fig. 52. x 2 diam. 



Fig. 54. G 187. The tegmen from above. A denotes the anterior radius. The rebated edges of the 

 deltoids, forming the food-grooves, are clearly seen, and in the groove near the centre some remains of 

 cover-plates. Cf. text-fig. 51. x 3 diam. 



Fig. 55. G152. Seen from left side. In the periproct, P, are some scattered periproctals (§ 332). 

 Cf. text-fig. 50. X 2 diam. 



Fig. 56. G180. An isolated plate, of which the actual stereom is preserved (§§ 316, 317). 

 X 4i diam. 



TRANS. ROY. SOC. EDIN., VOL. XLIX. PART II. (NO. 6). 68 



