REPORT ON THE CRINOIDEA. 



39 



there are a few species with low and wide radials, the distal faces of which have a steep 

 slope, so that they do not enter largely into the ventral aspect of the calyx. Such are 

 the two which I have described as Actinometra cheltonensis and Actinometra imrtem- 

 bergica. Only the radials of the former species are known and the slope of the 

 articular faces is scarcely as steep as in most recent examples of the genus. It is steeper 

 in Actinometra wurtembergica, which seems to have had a thicker centro-dorsal and 

 more numerous cirri than is usually the case in recent species of the genus. One might 

 also be inclined to refer to this genus the Antedon picteti, de Loriol, and Antedon 

 infracretacea, Ooster, both of which occur in the Valangian and have low wide radials 

 with a thin centro-dorsal, bearing but few cirri. They retain, however, the sloping 

 articular faces which are so characteristic of Antedon; and I think therefore that, for the 

 present at any rate, they should be referred to that genus. 



Table showing the Distribution of the Fossil Coniatxdee in Space and in Time. 



A. = Antedon. a. = Actinometra. E. = Eudiocrinus. T. = Thiolliericrinus. 



Two points may be noted about the fossil Comatulas generally. The calyces of many 

 of them reach a considerable relative size, the centro-dorsal being sometimes as much as 

 9 to 13 mm. in diameter, which is greater than that of nearly every living representative 

 of the family except Antedon eschrichti; while this type and Actinometra solan's 



