Dr. F. A. Bather — A Crinoidfrom the Red Crag. 209 



projecting beyond stem-facet and ornamented with small pustules 

 forming- a pentagon; traces of similar ornament on RE,, especially 

 a perradial prominence at the distal border of each. 



Holotype. — The unique specimen collected by Mr. P. G. H. Boswell. 



Horizon. — Newbournian zone of Red Crag (Middle Pliocene), 

 probably derived. 



Locality. — Felixstowe, Suffolk. 



EXPLANATION OF PLATE VIII. 



Fig. L — View of the holotype from above. 

 ,, 2. — Side view of the hoiotvpe. 



,, 3. — View of the holotype from below, showiug stem-faces. 

 All figures are enlarged six diameters, and in each the right and left sides remain 

 in the same position with regard to the beholder. Drawn by Mr. A. H. Searle. 



Postscript. 



Mr. F. "W. Harmer, F.G.S., has kindly sent me five other fragments 

 collected by him in the Red Crag, and presumed to be of crinoid origin. 



One of these is shaped like the tapering end of a belemnite, and 

 I can detect in it no crinoid structure. The outer crust is silica in 

 the form of beekite ; the interior, exposed at the broad, broken end, 

 is ferruginous (? limonite) with traces of calcite. 



Another is a cylindrical fragment, 6-2 by 4*8 mm., much worn, with 

 a beekite crust, and traces of radiate striae in the interior. If echino- 

 dermal, it might be the proximal end of an echinoid radiole or part of 

 a crinoid stem. 



Two specimens are certainly parts of Pentacrinid stems. One is 

 30"9 by about 5 mm., rather less in diameter at one end and swelling 

 suddenly to a maximum of 6 mm. at the other end, which is rounded. 

 The joint-face is not preserved ; the side-faces are smooth ; on the 

 sutures are slight indentations, radial in position. This orientation is 

 proved by the weathering of the thinner end of the fragment, where 

 the interradial ligamentar areas have been eaten into owing to their 

 less density. There is no trace of a cirriferous nodal. There can be 

 scarcely any doubt that this is part of the stem of Balanocrinus 

 sulhasaltiformis,^ and that it has been derived from the London Clay. 

 The other Pentacrinid stem-fragment probably belongs to the same 

 species ; it is rounded off rather acutely at one end ; at the other is an 

 apparent hypozygal with slight traces of the markings on the joint-face. 

 The substance of these specimens is apparently limonite, probably 

 altered from a previous pyritized stage. 



The remaining fragment is cylindrical, 11*8 mm. long, 5-3 mm. in 

 diameter at one end, tapering to 4*6 mm. at the other end, which is 

 more worn. The outer surface of the side-faces has been altered by 

 partial change into beekite, so that no sutures are visible. The joint- 

 face at the wider end is obscure, but shows some straight striae 

 radiating from the lumen ; here are still traces of calcite. The 

 narrower end is eaten into, and the lumen widened ; this enables one 

 to see that the fragment is composed of thin columnals, about 'b mm. 



^ Pentacrimis subbasaltiformis, J. de C. Sowerby, ex J. S. Miller nom. nud., in 

 N. T. Wetherell, 1840. 



DECADE V. — VOL. VI. — NO. V. 14 



