Genera and Species of Brisingidee. 



423 



with delicate subambulacral 

 spiue; rays delicate, very 

 deciduous. Genotype, Bri- 



sinffa fniffilis, Fisher 



(T. Abactinal skeleton of rays con- 

 sistingof independent, compressed 

 arches or costse as in Bvishi(ja, 

 but the integument between the 

 arches is crowded with numerous 

 • spineless, immersed, fenestrated, 

 thin plates, sometimes slightly 

 overlapping, yet leaving the in- 

 tegument quite inflexible; gonads 

 2 or 4 to each ray. 

 f^. First pair of adambulacral plates 

 united, and joined to their upper 

 side is a united pair of marginal 



Brisingella, isher. 



Fie 



Fiff. 6. 



Fig. 5. — Brisingella frayilia. Oral angle, actinal view. 

 Fig. 6. — Ditto. Lateral view of interbrachium, rays removed ; only the 

 articular surface of the adambula'crals and marginals is dotted. 



plates, four in all, as in Bri- 

 sinya; proximal adambulacral 

 plates higher than long; gonads 

 two to each ray. Genotype, . 

 Brisinya {Stegnobrisinya) pla- 



coderma, Fisher Stegnobrisinya, Fisher, 



f^. First pair of adambulacral plates 

 not joined together by the inter- 

 radial faces, but separate ; first 

 pair of marginal plates not 

 closely united by their inter- 

 radial faces, but only by the 

 adoral ends, to which also is 

 closely united the lower end of 

 the interradial plate, forming a 

 rude ^-^jof which the angle is the 

 apex of the interbrachial angle 



