AGASSIZ: PRELIMINARY REPORT ON THE ECHINI. t8 
geographical distribution, as well as a wide bathymetrical range. This 
will serve to show the extent to which many species can slowly migrate 
upon the bottom, even at a very considerable distance from land or con- 
tinental or insular slopes, when living in the track of a great equatorial 
current which supplies them with a constant and abundant supply of 
food. 
DESMOSTICHA, HAECKEL. 
CIDARIDZA, MULL. 
GONIOCIDARID AL, Harcse.. 
Dorocidaris panamensis A. Ac. 
Plate I. ; Plate II. Fig. 1. 
The test of this species is greatly flattened; the primary radioles are short, in 
many specimens not longer than the diameter of the test; they are compara- 
tively slender but with a coarser granulation than in the Atlantic species (D. 
papillata). The abactinal system is also smaller, the anal system more pentag- 
onal, and the genital plates more elongate than in the D. papillata, and the 
actinal spines are smaller than in that species. 
Station No. 3367, off Cocos Island, 100 fathoms. 
id * 3368, off Cocos Island, 66 fathoms. 
$6 “ 3378, off Galera Point, 112 fathoms. 
6 “ 3397, off Galera Point, 85 fathoms. 
Goniocidaris Doederleini A. Ac. 
Plate Lil. Fig. 1. 
The nearest ally of this species is G. canaliculata, from which it is readily 
distinguished by the greater flatness of the test and the very slender primary 
Genera. Range in fathoms. Genera. Range in fathoms. 
Suerocidaris . . . . +; 874 Hipponbe: 3). « . » 401 
Porocidaris .... . 1444 BIDWUISrIay ke st sy a OO 
Goniocidaris . . . . . 1975 Pourtalesia, 2 7". .-. -2b50 
Maye). ws sw « 1860 Homolampas. . . . . 1600 
momocidaris . ... . 1075 IMaretia Seas. oe Sos “B00 
Meelopieurds.. . . . . 1828 Echinocardium . . . . 2675 
Aspidodiadema. . . . 1800 Hemingter. so occte,c tw AOD 
Dermatodiadema . . . 800 Brissopsis. . . . . « 24865 
Phormosoma. . . . . 1100 PARTON ion unt op RNS anne LODO 
Temnechinus ... . 600 Cystechinus ... .. ~« 900 
Trigonocidaris . . . . 460 Wreehinus'.5).. i. sas). 0). G00 
MeOMInOB 4... « . '. 2400 Perinsten) sc h- .ohs ey er SOO 
Spherechinus ... . 400 Schizaster. . . .. . 1400 
