Genera and Species of Brisingida3. 429 



along eitlier side of the ray, as in typical Br'is'mga. 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 inteibrachial 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 tlie adambulacral plates. The adoral end of these 

 lirst marginal plates abuts against the base of the interradial 

 plate. In some species part of the second adambulacral plate, 

 as well as the first, is joined to its vis-a-vis. 



The niime Freyella has been retained for this group because 

 Perrier's figures of F. spinosa in the ' Travailleur ' and 

 * Talisman ' Report (1894, pi. 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 sjMtulifera, Fisher (Macassar Strait, 901 fatiioms), 

 belongs in this group, and probably also Freyella polycnema, 

 Perrier. I am uncertain about Sladen's species. I have 

 indicated under Freyellidaa 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 Freyella, the two 

 groups are really very different. Freyellidea lacks entirely 

 the syzygial joint between the first and second adambulacral 

 ])lates, and is the only genus except Astrodes 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 Astrodes) are here lacking. 



I have examined the following species which belong to 

 Freyellidea'. F. elegans (Verrill), F. propinqua (Ludwig), 

 F. 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 : F. sexradiata 

 (Perrier), F. henthophila (Sladen), F. fragilissima (Sladen), 

 F. heroina (Sladen), F. dimorpha (Sladen), F. remex 

 (Sladen), F. tubei-culata (Sladen). F. bracteata (Sladen) is 

 a synonym of F. elegans, according to Professor Verrill. 



The following species is the type of the genus. 



