PLATYCRINID/E. — CYATHOCRINUS. 63 



Golclfass lias been most unfortunate in liis synonymes, having referred to Miller's 

 Actinocrinus moniliformis, page 114 figures, 9, 12, & 13, as appertaining to the pinnatus; 

 and although Miller was incorrect in placing the specimen referred to among the Acli- 

 nocrini, it is certainly not the column of a Cyathocrinus. Goldfuss also gives figures 

 of the same form of column and refers them to the pinnatus. 



Miller's figure 9, is a column lying across the rays of another specimen, and which 

 Goldfuss appears to have mistaken for the side arms attached to it. 



4. Species. Cyathocrinus calcaratus. (Phillips.) 

 PL VIII. fig. 2, a, b, c. 



Definition. — Dorso-central plate quinque-partite and pentangular j first series of 

 perisomic plates five, second series six, five of which bear the rays. 



Synonymes and References. 



Cyathocrinus calcaratus. — Phill. Geol. York. 2. t. Zfig. 35. 



Formation and Localities. 



Mountain or Carboniferous limestone. — Bolland. 



The first series of perisomic plates are so much produced in their centres in this 

 species, as to become almost conical. 



The C. calcaratus was not extensively diffused in the carboniferous seas, so that its 

 remains are rarely met with in the deposits of that epoch, and even those few specimens 

 which have been developed are so imperfect that we know nothing of the number and 

 arrangement of its rays, or the structure of its column. 



The dorso-central plate is conical in this species, but depressed in the typical. 



5. Species. Cyathocrinus bursa. (Phillips.) 

 PI. VII. fig. 7, a. 



Definition. — Dorso-central plate quinque-partite, and somewhat depressed in the 

 centre for the articulation of the column; first series of perisomic plates five, all very 

 tumid in their centres; second series six, five of which bear the ravs. 



