230 Annals of the South African Museum. 



the remainder are much higher than broad (the 29th is three times 

 as high as thick), smooth and cylindrical. 



Basals completely fused into a truncated cone, about half a milli- 

 meter high, nearly half a millimeter in diameter, where it joins the 

 radials, and about one-third of a millimeter where it joins the stem. 

 Seen from the side, the lateral margins of this cone are distinctly 

 though very slightly concave. 



Radials 5, about -75 mm. high; the upper (distal) diameter of the 

 cup they form is one millimeter. Seen from the side, the lateral 

 margins of this cup are distinctly though slightly concave. 



I BR, about MO mm. long and *85 mm. wide, very little wider 

 distally than proximally. The lateral margins are very slightly 

 thinned and flaring. The median line is not at all carinate but is 

 barely elevated on the distal two-thirds of the plate. 



I Bn 2 , the axillary, is remarkably low and wide; it measures about 

 85 mm. in width, but is only about '60 mm. high, even in the 

 median line where it is slightly higher than at the sides. The lateral 

 portions are flat, in contrast to the middle, but are hardly flaring. 



The brachials are about twenty in number; the lowest is about 

 40 mm. wide where it joins the axillary but is only about -35 mm. 

 at the distal end, and that is the approximate width of the following 

 segments. The brachials are arranged in pairs, -75--80 mm. long, 

 the total length of the arms, from axillary to tip being about 8 mm. 

 The latero-distal margin of the distal brachial of each pair is 

 slightly projecting and overlapping, first on the outer side of the arm 

 (second brachial), then on the inner (fourth), and thus in regular 

 alternation, but the projection is much too slight to give the arm a 

 serrate or even a rough appearance. 



Colour, nearly white. 



P.F. 17350. Cape Point N. 86 E., 43 miles. 900-1000 fms. Gray 

 mud. 1 specimen only. Holotype South African Museum, no. A 6434. 



This is a most interesting little crinoid, clearly a Monachvcrinus, 

 but differing from all the previously known members of the genus 

 in the very wide, low axillaries, and in the slightly concave radials 

 and basals. These two characters taken in connection with the 

 large number of discoidal columnars and the structure of the arms, 

 make the species easily recognizable. As the genus is known from 

 both the Atlantic and Indian Oceans, its occurrence off South Africa 

 is quite natural. 



