198 PROCEEDINGS OF THE AMERICAN ACADEMY 



narrower in this species than in the Atlantic species. — Amboyna, 

 100 fathoms, 15 fathoms.* 



Porocidaris elegans, A. Ag., nov. sp. 



The principal differences between this species and P. purpurata 

 consist in the shape of the primary radioles. These are more uniform 

 in shape, some of them three times in length the diameter of the test, 

 with a comparatively short collar above the milled ring ; the length of 

 this collar is often half the length of the spine in P. purpurata. The 

 abactinal system of this species is remarkable for the great size of 

 the genital openings, placed entirely within the genital plates, and not 

 extending, as in P. purpurata, into the apical plates of the interambu- 

 lacral area. — Station 214, 500 fathoms ; Station 164, off New South 

 Wales, 950 fathoms, 410 fathoms. 



Goniocidaris florigera, A. Ag., nov. sp. 



In no species of the genus is there so great a difference between 

 the spines of different parts of the test, or of different individuals, 

 varying from short cupuliform or even spines terminating with radiat- 

 ing spokes, to long cylindrical radioles thickly covered with spines 

 irregularly arranged, or to gradually tapering spines with delicate ser- 

 rations and spines quite regularly placed. The ornamentation of the 

 test is limited to small, deep pits at the angles in the median line of the 

 interambulacral plates, with a sharjD bare line indicating the sutures 

 also at the junction of coronal plates with the poriferous zone. The 

 lower part of the ambulacral plates is covered by minute granules, 

 leaving the upper part of the plate bare ; median ambulacral space 

 wider than poriferous zone, coronal plates high, mammary boss small, 

 scrobicular area deep, not confluent, completely separated by interven- 

 ing secondary tubercles. Ocular plates heart-shaped, genital plates 

 hexagonal, both covered by coarse granulation ; papilla? sharp and 

 slender ; ten large anal plates, with smaller ones in centre ; genital 

 opening large, placed towards the centre of the plate. — Ki Islands, 

 129 fathoms ; Station 204, 100 fathoms. 



Salenia hastigera, A. Ag., nov. sp. 



Differs from Salenia varispina by the closer and uniform granula- 

 tion covering the abactinal system and the relatively smaller anal 



* Only the principal localities are given, showing the bathymetrical and geo- 

 graphical range. 



