190 BULLETIN OF THE 
Encope Michelini ۰ 
Station No. 39. 16 miles north of Zoblos Islands. 14 fms. 
Echinoneus semilunaris Lamx. 
Marianao, Havana, thrown upon beaches. 
(Sigsbee.) Off Havana. 80 fms. 
Echinolampas depressa Gray. 
Station No. 32. Lat, z3? 52 N., Long. 88° 05’ W. 95 fms. 
x “ 45, Lat. 25° 33’ N., Long. 84° 21 W. 101 fms. 
Conoclypus Sigsbei A. Ac. spec. nov. 
Plates I., YT. 
This magnificent species is by far the most striking sea-urchin I have seen. 
I shall always remember the particular haul when, on the edge of the Yukatan 
Bank, the dredge came up containing half a dozen of these huge brilliant 
lemon-colored Echini. The test is covered by small primary tubercles of uni- 
form size, quite regularly arranged on the plates of the test, both on the am- 
bulacral and interambulacral area. The tubercles on the actinal side are 
similarly arranged, with the exception of the vicinity of the ambitus, where 
they are more closely crowded together. The primary tubercles are surrounded 
by a deeply sunken narrow scrobicular area, much as in Echinolampas and 
Rhynchopygus. The miliary tubercles are uniformly scattered between the 
primaries, and are separated by irregular transparent glassy ridges and elongated 
pits, much as we find them on the actinal side of Rhynchopygus, but near the 
ambitus on the actinal side, where the primary tubercles are more closely 
crowded, they are separated by closely packed secondary tubercles. The acti- 
nal bourrelets are very prominent ; the floscelle large, broad, well defined, ex- 
tending nearly one third the distance of the actinostome to the ambitus. There 
are small, elongate, short-stemmed, slender, pyramidal pedicellarice scattered 
irregularly over the actinal surface, much less numerous on the side of the test. 
The primary spines are short, slender, cylindrical, rapidly tapering at extremity. 
The miliary and secondary spines similar to primary, only smaller. The apical 
system compact (Fig. 2); all the genital plates coalesce, centre of apex occupied 
Fra. 2 by the madreporic, developed into a prominent knob, pi, 
on the sides of which the ocular plates rise; four large 
genital openings, odd posterior genital wanting ; the 
ambulacral zones all identical in structure. Two rows, 
made up of distant pores, extending two thirds the distance 
of the apex to ambitus, form rudimentary petaloid am- 
bulacra. The pores suddenly come close together, the po- 
riferous zones becoming extremely narrow, and. extending 
thus over to the actinal side until they meet the floscelles. 
Anal system occupied by an outer row of three large plates and one smaller one, 
with a few smaller plates closing the outer edge of the anal system. While describ- 
