DOROCIDARIS BLAKEI. 9 



Dorocidaris Blakei A.. Ag. 

 Dorocidaris Blakei A. Ag., 1878. Bull. M. C. Z., V, 9, p. 185. PI. IV; " Blake " Ech. PL I. 



Plate 12^ figs. ^-G 



Although the large globiferous pedicellariae of this species arc much less 

 variable than those of Bariletti, nevertheless they show sufficient diversity to 

 prevent assigning them all to a single type. The opening at the tip may be 

 broadly triangular with a well-defined lip (PI. 12^, fig. ^), but it is commonly 

 more elongated (PI. 12*', fig. 5), and may be so narrow (PI. 12'', fig. G) as to 

 approach the form which Mortensen^ assigns to " Schizocidaris." The valves 

 are, however, much broader than in that group, and none were found which 

 would indicate any other genus than Dorocidaris. 



Dorocidaris panamensis A. Ag. 



Dorocidaris panamensis A. Ag., 1898. Bull. M. C. Z., XXXII, 5, p. 73. 

 Pis. I and II, fig. 1; Pan. Deep Sea Ech. PI. 1. 



Plate 2, figs. 5-8. 



Only two kinds of pedicellariae are present in the specimens of this 

 species which are at hand, as the tridentate are entirely wanting. 



The large globiferous pedicellariae (PI. 2, fig. 5) are much like those in 

 Cidaris. The valves are .90-.95 mm. in length and the stalk is about the 

 same or a little shorter ; it has no limb. These pedicellariae are not very 

 common, but occur between the primary spines on the interambulacra. 



The small globiferous pedicellariae (PI. 2, figs. 6-S) are quite different 

 from the large ones and sometimes have a large end-tooth (PI. 2, fig. s) as in 

 Cidaris. The valves are only .30-.60 mm. in length, while the stalk varies 

 from .30 to 2.50 mm. They are common on all parts of the test. 



Dorocidaris bracteata A. Ag. 



Dorocidaris bracteata A. Ag., 1879. Proc. Am. Acad., XIV, p. 197. 



Plate 3, figs. 15-2S. 



Three small specimens of a Cidaris were collected at Station 3746, May 19, 

 1900, off Suno Saki, Sagami Bay, Japan, in 49 fathoms, gj. s. p., the largest of 

 which has a test 15 mm. in diameter, and the smallest only 8 mm. We take 



1 Ingolf Exped. Echinoidea, 1903, Vi. T, p. 25. 



