Genera and Species of Brisingide. 423 
with delicate subambulacral 
spine; rays delicate, very 
deciduous. Genotype, Brv- 
singa fragilis, Fisher ...... Brisingella, isher. 
e’, Abactinal skeleton of rays con- 
sisting of independent, compressed 
arches or coste as in Srisinga, 
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 pairof adambulacral plates 
united, and joined to their upper 
side is a united pair of marginal 
Fig. 5.— Brisingella fragilis. Oral angle, actinal view. 
Fig, 6.—Ditto. Lateral view of interbrachium, rays removed ; only the 
articular surface of the adambulacrals and marginals is dotted. 
plates, four in all, as in Bri- 
singa; proximal adambulacral 
plates higher than long; gonads 
two to each ray. Genotype,: 
Brisinga (Stegnobrisinga) pla- 
coderma, Fisher ............ Stegnobrisinga, Fisher, 
Jf?. 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 x, of which theangle is the 
apex of the interbrachial angle 
