1907-8.] Notes ON THE OPHIURIAN GENUS, PROTASTER. 367 
Non Protaster of Meek and Worthen, Dewalque, Davy. 
Protasteridz with a well-marked disc; long, tapering, very flexible 
arms. Some of the ambulacral ossicles are Y-shaped. Scales of the disc 
fairly large. 
The following species are mentioned by Gregory: P. sedgweckt, 
Forbes, P. forbest, Hall and P. dzforts, Gregory, a new species. 
Genus II, Bundenbachia, S¢irtz. 
Disc soft and delicate; covering plates apparently small and thin. 
Ambulacral ossicles with a dumbbell-shaped body and thin tapering 
WING ec: Bundenbachia differs from Protaster by the irregular 
nature and soft plating of the disc, by the presence of spine bearing 
plates attached to the adambulacral ossicles, and by the different form 
of the ambulacral ossicles. 
Family II, Palzophiuride. 
Lysophiurae, in which the ambulacral ossicles are long and bar- 
shaped with the longer axis parallel to the arm. The ossicles are never 
boot-shaped. 
‘Five genera are established. The forms previously described as 
Protaster are as follows : 
Protaster brisingoides, Greg, becomes type of new genus Sturtzura. 
Protaster leptosoma, Salter, becomes Stiirtzura leptosoma. Also Tent- 
aster cylindricus, Billings becomes the type of a new genus, 7@nzura 
Eugaster, Hall, and P7tzlonaster, Hall are included. 
Order IT, STREPTOPHIURA, Bell. 
Ophiuroida, in which the ambulacral ossicles are opposite. .. . 
Protaster miltont, Salter, becomes the type of a new genus, Lapworthura. 
Protaster daoulasensis, Davy, becomes Furcaster daoulasensis. Protaster 
gregarius, Meek and Worthen, becomes Aganaster gregarius. 
Of all the species of Protaster there still remain the following : 
Protaster saltert, Sowerby (Forbes). This species must be removed 
from the genus as now defined, because the ossicles are described as 
triangular. 
