1906] The Species of Botryocrinus. 103 



them on the upper surface of the plate x. There is one small, 

 deeply grooved facet in the middle, and another rather smaller 

 immediately to the right ot this. The right and left slopes 

 of anal x have larger curved facets, of which that on the left 

 still bears a fragment of the succeeding tube-plate. Two 

 small similar facets are clear on the adjacent slope of left 

 posterior radial and one at all events is to be made out on 

 right posterior radial. These facets are surrounded by a 

 slightly elevated rim, so that their size and position are well de- 

 fined. The arrangement of the tube-plates of the proximal row 

 must therefore have been very like that of Botryocrinus ramostssi- 

 mus, as figured in 'Crinoidea of Gotland' I, pi. v, fig. 164. 



Among all specimens of Botryocrinus hitherto examined, this 

 is the only one in which the greatest width of the cup is less than 

 the height. This fact and the bell-shape of the cup certainly war- 

 rant the retention of the species. 



Botryocrinus americanus. 



Botryoii inns americanus, R. R. Rowley, 1904, Greene's 'Contrib. Indiana 

 Palaeont.', Part XVIII, p. 184, pi. lv, ff. 12-14. 



Dorsal cup spreading out rapidly from the narrow column, 

 then ascending with approximately straight sides ; all plates 

 somewhat tumid, especially BB, which have wart like prominences 

 in their lower part. Height of cup (as drawn 8 1 8 6 mm.), 

 100 ; diameter of column (2.3 mm.) 27 ; width at bottom of BB 

 and top of RR (circa. 9 5 mm.), 113. IBB low as seen from the 

 side, but their length is greater than their width. BB higher 

 than wide. RR (except perhaps the two posterior) slightly wider 

 than high. Arm-facet more than .5 of R. Number of tube- 

 plates supported by x uncertain. Proximal columnal circular. 



Middle Devonian, Hamilton Group, near Charlestown, Ind. 



Holotype in collection of G. K. Greene, New Albany, Ind. 



Professor Rowley's clear description unfortunately omils a few 

 details that would have helped to complete the present diagnosis.* 



*Mr. Greene would, I am confident, have acceded to my request to 

 borrow the holotype for examination ; but, as I regret to learn from Prof. 

 Rowley, illness has prevented him from attending to business for some 

 months. 10th July, 1906. 



