LECANOCRINIDAE 1 79 



This species is represented by six good specimens, five of which are figured; they 

 thoroughly exhibit its characters and its irregularities. The anal tube is more or less dis- 

 placed in most of them, but is best seen in its entirety in Plate X, figures 12, 13. Figures 10b 

 and 14 show better the truncate posterior basal and the large first plate, anal x, with its sutural 

 connection at each side. There is a strong tendency to reduction in the number of. primi- 

 brachs, as in Lecanocrinus and Pycnosaccus, three out of the five specimens having but one in 

 one or more rays. The two-secundibrach feature found to some extent in Pycnosaccus 

 nodulosus and Gnorimocrinus varians is substantially constant throughout the specimens, 

 with occasional reduction to one. The perisomic integument of the regular interbrachial 

 areas is composed of more substantial plates than usual in this structure ; they seem in places 

 to be connected by definite sutural faces, but are without any regular arrangement such as 

 would suggest calling them interbrachials. The fine specimen shown by figure 11 is abnormal 

 on the opposite side, lacking the left anterior ray, apparently from injury during life. An 

 abnormal specimen of Gnorimocrinus expansus, Plate XLVII, figure 5, has the anal side 

 almost the same as in this species, but lacks the other characters ; and it shows by what close 

 intermediate stages the two genera are related. 



The specific name is proposed as a slight acknowledgment of the cordial cooperation in 

 my work which I have at all times received from Dr. Ray S. Bassler, Curator of Paleontology 

 in the U. S. National Museum. 



Types. In the author's collection. 



Horizon and locality. Silurian, Upper Niagaran, Brownsport limestone ; Decaturville, 

 Decatur Co., Tennessee. 



