148 PROCEEDINGS OF THE ACADEMY OP [1886. 



VASOCRINUS Lyon, Rev. i, p. 97. 

 STREPTOCRINUS W. and Sp. 



(TrpcTTTds, twisted ; Kpivov, a lily. 



Ophiocrinus Angelin, 1878. Rev. i, p. 97. 



The name Ophiocrinus is preoccupied by Salter, who proposed 

 it in 1856 for a Rhodocrinoid from Southern Africa, which, how- 

 ever, is not properly defined. Semper also used the name in 

 1868 for a Neocrinoid, and again Charlesworth, but without pub- 

 lishing the description. The Swedish form, therefore, requires a 

 new name, for which we adopt Streptocrinus, in allusion to the 

 convoluted state of the ventral tube. 



-'Streptocrinus crotalurus (Angelin), Ophiocrinus crotalurus, Iconogr. Crin. Suec, 

 p. 24, PI. 4, figs. 8 a-c. Upper Silurian. Gothland, Sweden. 



BOTRYOCRINUS Angelin, Rev. I, p. 97. 



SICYOCRINUS Angelin, Rev. I, p. 99. 



BARYCRINUS Wachsmuth, Rev. I, p. 99. 



The genus Barycrinus differs from other Cyathocrinidge in 

 having a shallow cal3'x, constructed of heavy plates, arms massive, 

 and composed of short joints. These differences are so marked 

 that we have strong doubts whether it ought to be placed in this 

 famil3^ 



The diagram of Barycrinus^ PL I, fig. 3, in Part I of this 

 Revision, is incorrect as to the axial canal, which should have 

 shown the processes radzai, instead of interradial. On page 101, 

 of Part I, we were made to say that the sections of the column 

 of Barycrinus are radial and the sutures interradial, whereas it 

 should be that the sections of the column are " interradial and 

 the sutures radial ; the opposite of Heterocrinus, in which they 

 are interradial." 



No new species have been described since our list, but Arach- 

 nocrinus bulbosus (Hall), W. and Sp., was referred by S. A. Miller 

 erroneously to Barycrinus. 



Cyathocrinus subtu^nidus M. and W., which we took to be a 

 Barycrinus, must be changed back to Cyathocrinus. The species 

 is closely allied to Cyathocrinus barydactylus W. and Sp. 



