270 PROF. W. J. SOLLAS ON BEAHMACRINUS [May I9OO, 



the Heterocrinida?, which are fistulate, while the Pisocrinidae, so far 

 as we know, are not. 1 We shall thus have : — 



Family Pisocrinidse ? Ang. (emend.). 



Calyx small, monocyclic, with five radial plates and a single 

 radi-anal on the dorsal and five oral plates on the ventral surface. 

 Arms five, either simple, uniserial, and destitute of pinnules, or 

 dichotomous and pinnulate. 



Genus 1. Pisocrinus, De Kon. With five basals, of which the 

 left anterior meets the middle of the base of the anterior radial, 

 and is exclusively united with it. Arms simple, not pinnulate. 

 Silurian. 



Genus 2. Triacrinus, Miinst. With three basals. Arms simple, 

 not pinnulate. Devonian and Carboniferous. 



Genus 3. Cicerocrinus, gen.nov. Calyx with five basals, of which 

 the left posterior meets the middle of the base of the left posterior 

 radial, and is exclusively united with it. 



The arms regularly dichotomize twice ; the brachial ossicles are 

 united by syzygy, and bear pinnules. 



Type, Cicerocrinus elegans, sp. nov. Stem, calyx, and arms 

 devoid of ornament and smooth ; stem round ; calyx elongated, 

 conical ; primary brachials two, secondary (in the only specimen 

 known) eighteen, and tertiary twenty-eight in number. Silurian. 

 Locality (?), probably Dudley. 



EXPLANATION OF PLATE XVI. 



[The figures are all taken from photographs of the specimens, made by- 

 Mr. J. A. Kobinson.] 



Fig. 1. Brahmacrinus ponderosus, gen. et sp. nov. The calyx nearly of the 

 natural size (X 09), posterior view. The anal interradius almost 

 faces the observer, but is turned slightly away to the left. 



Fig. 2. The same: calyx seen from the right posterior side. X 0'9. 



Fig. 3. Cicerocrinus elegans, gen. et sp. nov. Specimen seen from the anterior 

 side. Nat. size. 



Fig. 4. The same, giving a magnified view of the arms. X 2. 



Discussion. 



Mr. F. A. Bather congratulated the Author on his find of a new 

 Monocyclic Inadunate crinoid from the Wenlock Limestone. A 

 brief inspection of the fossil had not led him to doubt the Author's 

 description, but he differed as to the systematic position of the genus 

 for|the following reasons : — Though the cup-structure was that of 

 Pisocrinus, it must be remembered that the essentials of this struc- 

 ture were common to Heterocrinidse, Calceocrinidse, Pisocrinidae, 



1 [Mr. Bather has called my attention to the fact that he has described a 

 fistular character as existing in Pisocrinus. I have now consequently no hesi- 

 tation in regarding Cicerocrinus as a link uniting the two families.] 



