104 



Mr. W. K. Fisher's Notes on Asteroidea. 



as of secondary importance in true Freyella, which is realty 

 not very closely related to the genus containing F. fecunda. 

 The latter is distinguished by a syzygy, well-developed 

 marginals for the interbrachium, and serial gonads. 



For the genus, which I called Freyella, I propose the name 

 Freyellaster, with Freyellaster fecund us (Fisher) as type. In 

 this group belong Freyellaster spatulifer (Fisher), Macassar 

 Strait, 901 fathoms; Freyellaster scafaris (A. H. Clark), 

 Galapagos Islands, 812 fathoms ; and probably also Freyella 

 polycnsma, Perrier. 



The group which I termed Freyillidea will therefore become 

 Freyella, with Freyella spinosa as type, and Freyellidea will 

 drop out as a synonym. 



The Genus Hymenodiscus, Perrier. — In the paper on the 

 Brisingidse above referred to, this genus was'not placed in 

 the synoptical key owing to lack of data. I have since 



Fig. 1. 



Fig. % 



Fig. 1. — Hymenodiscus agassizi. An interbrachium from above first 



marginal plates, dotted. 

 Fig. 2. — Hymenodiscus agassizi. An interbrachium from actinal side. 



a, adambulacral plates ; am, ambulacral plates ; i, interradial ; 



m, marginals; o, mouth-plates. 



examined Perrier's type in the Museum of Comparative 

 Zoology (no. 1148) *. The type of Hymenodiscus agassizi 

 is almost certainly a very immature specimen, as it is small, 

 and there are no gonads. There are no skeletal arches on 

 the rays and the greater part of the thin abactinal integument 



* For description see Perrier, 1884, ' Memoire sur les 6toiles de naer 

 recueillies dans la iner des Antilles,' p. 189, pis. i. & ii. 



