126 
Phyllacanthus fustigere, Diadema nudum, Trichodiadema (n. 
gen.) Rodgersii, Echinometra brunnea, Glyptocidaris (n. gen.) ere- 
nularis, Toxoeidaris nuda, T. cerassispina, T. globulosa, T. depressa, 
Psammechinus intermedins, Ps. pulcherrimaus, Toxopnreustes carnosus, 
Mierocyphus elegans, Anthechinus (n. gen.) roseus, Temnotrema 
(n. gen.) sculpta, Laganum Putnami, Scaphechinus mirabilis, Lobo- 
phora texta, Maretia alta, Lovenia triangularis, Echinocardium Stimp- 
sonii — von denen übrigens mehrere Arten schon vor Agassiz von 
Barnard als neu erkannt und charakterisirt sind. Die Diagno- 
sen der neuen Genera lauten wie folgt: 
Triehodiadema A. Ag. Ambulacra of a true Diadema; 
pores arranged in irregular vertical arcs of three pairs of pores; not 
spreading near the actinal region. Two rows of large tubercles in 
the ambulacral space. Interambulacral area to the abactinal re- 
gion; on each side of these rows tubercles smaller than the am- 
bulacral, arranged in vertical rows and not in oblique rows, as is 
usual in the Diademmatidae. Abactinal system almost cireular, 
which distinguishes this genus at once from all other known genera 
of this family. Shell thick; tubereles erenulated; spines resembling 
those of Echinothrix, but stouter and more tapering. 
Glypiocidaris A. Ag. Pores arranged, as in Heliocidaris, 
in narrow irregular rows; do not spread near actinostome. "Tuber- 
cles erenulated; spines tapering, long. Two principal rows of in- 
terambulacral and ambulacral tubercles; miliaries not numerous. 
Anthechinus A. Ag. Small pentagonal sea-urchins, with 
prominent abactinal system and openings at angles of plates. The 
ambulacra convex, projecting beyond the level of interambulacral 
space, which is quite depressed. Median ambulacral and interam- 
bulacral space free from spines. The bare space follows the line 
of plates and is not sunken, as in Microcyphus and Temnopleurus, 
but slopes gradually to the edge of the plate. Tubercles very mi- 
nute, somewhat larger round the mouth, where they are arranged 
in diverging rows, extending about half way to the abactinal area, 
while they are scattered irregularly on the portion of the plates 
which they cover partially. . Pores arranged in single pairs in a 
vertical row. 
Temnotrema A. Ag. Small sea-urchins, almost globular, 
with marked grooves at the sutures of the plates, as in Salmacis. 
Two prineipal vertical rows of tubercles; smaller tubereles crowded 
irregularly over the rest of the plate. Abactinal system pentago- 
nal, with prominent angles, the anal system consisting of four pla- 
tes as in Echinocidaris. Spines like those of Salmacis, though finer 
