V. Botryocrinus. 403 



Description of the Specimen. 



Dorsal cup. — Similar to that of B. decadactylus, but with 

 the projection of the radials and the axial folding slightly 

 exaggerated. Breadth at base 3*6 millim. ; breadth at summit 

 8*5 millim. ; height 1 1 millim. 



Infrabasals 5, pentagonal ; greatest height 2*2 millim. ; 

 greatest width 3 millim. 



Basals 5 ; 3 hexagonal, 2 heptagonal ; show slight axial 

 folding ; greatest height 3*5 millim. ; greatest width 3*5 

 millim. 



Radials 5 ; of normal shape, project outwards rather more 

 than in B. decadactylus, show slight axial folding ; height to 

 bottom of facet 3*25 millim., greatest width 5*4 millim., width 

 of facet 2*25 millim. The articular surface is not clearly seen, 

 but appears to be the same as in B. decadactylus. The axial 

 canal is not separated from the ventral groove. The surface 

 of the radials, where well preserved, is very slightly sha- 

 greened, with the rugosities arranged concentrically. 



The Arms are preserved to a length of 71 millim., but must 

 have been at least 80 millim. long when perfect, i. e. more 

 than seven times length of cup. Apart from the abnormalities 

 in their branching, the essential characters are as follows. 

 The sutures between the ossicles are parallel, except in quite 

 the distal part of the arm, where they alternate at a very slight 

 angle ; the arms consequently have a more rigid appearance ; 

 their sides are almost straight, the backs of the ossicles being 

 regularly rounded and only very slightly moniliform. Height 

 of ossicles ■§■ of width. 



Costals 4 in each of the two rays visible ; width and height 

 both 2*5 millim. ; the axillary expands to 3*9 millim. 



Pinnules very long and thin ; one measured about halfway 

 up an arm is 16 millim. long, with a mean width of '5 millim., 

 and is composed of ossicles '75 millim. long. They are more 

 square and flattened than is usually the case with B. deca- 

 dactylus. 



The axial canal appears, in the distal part of the arms 

 at all events, to have been separated by stereom from the 

 ventral groove. 



The covering-plates, so far as any indications are given by 

 this specimen, appear to have been much the same as in B. 

 decadactylus^ but on the pinnules at least were proportionately 

 smaller. 



Anal structures : — Radianal measures 2 millim. from anal 

 x to right posterior basal, and 14 millim. in the transverse 

 direction. 



