108 Mr. E. A. Smith on Species of 



arrangement of 8j)iiies uu the dorsal smfnce ; but towards tlie 

 amljulacral furrow there is, first of all, parallel with the spines 

 which border it, a series of very small spines, only one on each 

 plate, so that a narrow bare space is seen ; above this the 

 spines are two or three on a plate. 



Pteraster affinis, sp. no v.? 



Discus magnus, 5-radiatus, inferue planus, supra convcxus, medio- 

 criter crassus, latitudine radiorum lougitudinem adatquaus ; radii 

 breves, ad basim lati, versus extreinitates recurvatas sulcos 

 ambulacrales exponentes rajnde angustantes ; eorum superficies 

 iufera utrinquc membrana tenui spinis circiter 30 gracilibus 

 inunita (quarum apices vix extra membranam projiciunt) obtecta ; 

 tesBclkie iuterambulacrales spinas quatuor graciles, membrana 

 tenuissima fere ad earum apices extendente connexas gerentes ; 

 oris angulus quisque interradialis spinas 8 similes, membrana 

 pariter connexas gerens, extremis duabus quam coeterte maxime 

 brevioribus, mediauis duabus lougissimis ; illas supra sunt spinte 

 dua3 crassa), altera alteram parallela, medio leviter concavce, longi- 

 tudine spiuarum 30 luteralium clongatissimam tequantes, et versus 

 apices leviter acuminata3 ; superficies dorsalis et laterales pro- 

 jecturis minimis spiuiferis munitse, et inter has poris miuutis 

 baud numerosis perforata? ; spinne supra projecturas scabroe 4-10, 

 membrana praBter ad apices audcta^ ; foramen centrale mediocre, 

 circulare, laciuia spiuarum brevium membrana connexarum cir- 

 cumdatum. 



Exempli maximi disci diam. 15 millim., crass. 7 ; radiorum longit. 17, 

 diam. ad basim 8. Exempli minoris disci diam. 10 milUm., 

 C]"ass. 5, radiorum longit. 9. 



This species approaches very closely to Pt. Dance of Verrill, 

 described in the 'Proceedings' of the Boston Society of Natm-al 

 History, 1869, vol. vii. pp. 386 & 387, and which is supposed 

 to have been found at Rio Janeiro. It appears, however, to 

 be provided with longer arras ; the spines of the dorsal fascicles 

 are everywhere similar and scabrous ; the spines at the inter- 

 radial comers of the mouth are only eight in number ; and the 

 two larger spines above them are not very long, but stout. In 

 these respects it chiefly differs from Pt. Dance. The smaller spe- 

 cimen^ it will be noticed, is considerably shorter in the rays. 



Porania antarctica^ sp. nov. 



Discus 5-radiatus, mediocriter crassus, latitudine radiorum longitu- 

 dinem sequans ; superficies infera omniuo plana, supera convexa ; 

 radii aliqijanto breviter eonici, versus apicem aeumiuati ; totum ani- 

 mal cute crassa carnosa annctum, inferue a marginibus ad sulcos 

 ambulacrales lineariter radiatim sulcata, superne lasvi spinis paucis 

 tubcrcularibus parvis prope medium supraque radios sparsim or- 



