Genera and Species of Brisingide. 429 
along either side of the ray, as in typical Brisinga. In this 
restricted genus Freyella, as in the restricted Brisinga, the 
first adambulacral plate is closely united to its fellow of the 
adjacent ray, at the apex of the interbrachial angle; and 
immediately above them and joined to their upper sides is a 
closely apposed pair of marginal plates, the first of a series 
which extends a variable distance along the base of the ray, 
just above the adambulacral plates. The adoral end of these 
first marginal plates abuts against the base of the interradial 
plate. Insome species part of the second adambulacral plate, 
as well as the first, is joined to its vzs-d-vis. 
The name Freyella has been retained for this group because 
Perrier’s figures of J’. spinosa in the ‘Travailleur? and 
‘Talisman’ Report (1894, pl. viii.) seem to indicate that the 
first pair of adambulacral plates in each interbrachium is 
united, while the long genital region indicates serial gonads. 
Freyella spatulifera, Fisher (Macassar Strait, 901 fathoms), 
belongs in this group, and probably also Freyella polycnema, 
Perrier. [ am uncertain about Sladen’s species. I have 
indicated under Freyellidea the species which I believe to be 
referable to that genus. 
FREYELLIDEA, gen. nov. 
Diagnosis.—As given in foregoing synopsis. 
Although the species of this genus have been considered 
congeneric with those of the restricted Preyella, the two 
groups are really very different. Freyellidea lacks entirely 
the syzygial joint between the first and second adambulacral 
plates, and is the only genus except Astrocles in which there 
is no syzygy at the base of the ray. Furthermore, the mar- 
ginal plates which are present in the interbrachial angle of 
other genera (except Astrocles) are here lacking. 
I have examined the following species which belong to 
Freyellidea: FE. elegans (Verrill), propingua (Ludwig), 
Ff. pacifica (Ludwig), F. insignis (Ludwig). Without a 
knowledge of the gonads and of details of the interbrachium 
it is not possible to be certain that the following species 
belong in Freyellidea, but, as nearly as one can judge by the 
figures, they appear to. Such species are: #. sevradiata 
(Perrier), E. benthophila (Sladen), F. fragilissima (Sladen), 
f, heroina (Sladen), #. dimorpha (Sladen), F. remex 
(Sladen), £. tuberculata (Sladen). F. bracteata (Sladen) is 
a synonym of £’, elegans, according to Professor Verrill. 
The following species is the type of the genus. 
