No. 2. — Reports on the Results of Dredging, under the Supervision 
of ALEXANDER AGASSIZ, in the Caribbean Sea in 1878-79, and 
along the Atlantic Coast of the United States during the Summer 
of 1880, by the U. S. Coast Survey Steamer “Blake,” COM- 
MANDER J. R. BARTLETT, U. S. N., Commanding. 
(Published by permission of CARLILE P. PATTERSON, Supt. U. S. Coast and 
Geodetic Survey.) 
IX. 
Preliminary Report on the Echini, by ALEXANDER AGASSIZ. 
Cidaris tribuloides Br. 
Station 142. 27 fathoms. Flannegan Passage. 
o ไซ ส DRS, Off St. Kitts. 
Dorocidaris Bartletti A. Ac. n. sp. 
At St. Vincent in 95 fathoms, at Martinique in 210 fathoms, and at Montserrat 
in 88 fathoms, a number of the peculiar spiny transversely banded radioles, similar 
to Goniocidaris bispinosa were collected, some of which I mentioned in the Pre- 
liminary Report of the Echini of the “Blake” Expedition for 1877-78, p. 186. 
From Barbados a few specimens were collected, showing that these spines 
belong to a Dorocidaris which differs from D. papillata and D. Blakei in the 
shape of the plates of the abactinal system. These specimens can at once be 
distinguished from the above species by the large size of the triangular ocular 
plates in contact with the extremities of the large anal plates inserted between 
the genital plates. 
It may be that some of the specimens formerly referred to D. papillata 
(D. abyssicola), with spines having serrated edges, belong to this species. 
Station 155. 88 fathoms. Off Montserrat. 
ec 157. 190 e e ec 
m 166. 150 AS * Guadeloupe. 
M 177. 118 n * Dominica. 
ee UP 210 i * Martinique. 
". 908. 7 9 o EST 
«6 209. 189 ce € 113 
VOL. VIII. — NO. 2. 
