F. A. Bather — On Apiocrinua from the Muschelkalk. 117 



The specimen (Fig. 1) consists of — 



Portion of stem 8-Omm. long 



Cup 2-0 mm. high 



Portion of arms 3-0 mm. long 



Pinnules extending beyond arms 1-5 mm. 



Total absolute length (appearing about 1 mm. 



less owing to cm-vatui-e) 14-5 mm. 



There is also a portion of an arm, obviously belonging to this 

 specimen, bent downwards along its left side. Other arm-fragments, 

 probably derived from this individual, are scattered -over the small 

 slab of stone (5 x 3 5 cm.) on which it lies.^ This also contains a 

 crenelate columnal, almost certainly belonging to Dadocrinus gracilis. 



The Cup (Fig. 2) consists of two circlets — basals and I'adials ; 

 doubtless five in each circlet. 



Of the Basals three are visible in whole or part. That in the 

 middle, which is clearly seen, is a pentagon, with even horizontal 

 base. Height 1*1 mm. ; proportion of height to greatest width 

 almost 3 : 2. The other basals are of similar size and shape, 

 except that their bases appear to slope downwards away from the 

 middle one. 



Of the Radials, three are visible in whole or part. That in the 

 middle, which is clearly seen, is a pentagon with the upper angles 

 slightly truncate or rounded, and with the distal margin slightly 

 curved by a narrow median depression and two broader depressions 

 on either side. A distal margin with similar curvature, more 

 emphasized, is figured for Bhizocrinus Rawsoni, by P. H. Carpenter 

 ("Challenger Report, Stalked Crinoids," pi. liii, fig. 8). Height 

 about 1-2 mm. ; width about 1*3 mm. The curvature necessarily 

 foreshortens the vi^idth in the figure. The other radials appear 

 to be of much the same size and shape. This middle radial is 

 peculiar in the presence of a fine furrow running across its upper 

 third and trending downwards from left to right ; this may repre- 

 sent an abnormal fission of the radial, for such does occasionally 

 occur, and may in some cases be regarded by a speculative mind 

 as a reversion to the horizontal bisection of certain radials 

 characterizing so many Monocyclic Inadunate Crinoids. The 

 radial to the right exhibits a slight furrow parallel to its distal 

 margin. 



The inter-basal and inter-radial sutures are fairly straight ; but 

 the basi-radial sutures are a little flexuous, and show appearances 

 of a slight median depression in each. 



Portions of three Arms are visible, directly attached to the cup 

 (Fig. 2). 



Of these, that on the left consists only of portions of two or three 

 brachials imperfectly seen from the side, and needs mention only 

 because of its position, which suggests, if it does not prove, that 

 during life the arms could be bent outwards from their union with 

 the cup itself, at an angle slightly exceeding the slope of the sides 

 of the cup. The proximal brachials of the middle and left-hand 

 arms are, on the contrary, bent inwards, so as to lie at as great an 



