190 BULLETIN OF THE 



Encope Michelini Agass. 

 Station No. 39. 16 miles north of Zoblos Islands. 14 fms. 



Echinoneus semilunaris Lamk. 

 Marianao, Havana, thrown upon beaches. 

 (Sigsbee.) Off Havana. 80 fms. 



Echinolampas depressa Gray. 

 Station No. 32. Lat. 23° 52' N., Long. 88° 05' AV. 95 fms. 

 « « 45. Lat. 25° 33' N., Long. 84° 21' W. 101 fms. 



Conoclypus Sigsbei A. Ag. spec. nov. 



Plates I., II. 



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 l)y small primary tubercles of uni- 

 form size, quite regularly arranged on the plates of the test, both on the am- 

 hulacral 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 Echinolamims and 

 Rhynchopyfjus. 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 Ilhynchopygus, 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 pedicellariaj scattered 

 irregularly over the actinal surface, mucli 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 

 by the madreporic, developed into a prominent knob, fi, 

 on the sides of which the ocular plates rise ; four large 

 genital openings, odd posterior genital wanting ; the 

 anibulacrul zones all identical in structure. Two rows, 

 made \\\> of distant pores, extending two thirds the distance 

 of the apex to ambitus, form rudimentary i)etaloid am- 

 bulacra. The pores suddenly come close to;;ether, the po- 

 liferous 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 tlirec large jdates and one; smaller one, 

 with a few smaller plates closing the outer edge of the anal system. While descrilj- 



