ASTEROIDEA 129 



No naked dorsal interradial plate. A horizontal furrow spine 

 separating the consecutive pairs of tube-feet. Outer adambu- 

 lacral spine not widened . . Fr. spinosa E, Perrier 



3. Arms 8 ; no furrow spine. Skeletal plates in proximal part of 



arms irregular polygonal . . . Fr. recta Kohler 



Arms 6 (exceptionally- 5) . . . . . . .4 



4. Skeletal plates in proximal part of arms regular, elongate, hexa- 



gonal. Xo furrow spine . . Fr. tuberculata Sladen 



Skeletal plates in proximal part of arms irregular polygonal ; 



a small furrow spine . . . Fr. sexradiata E. Perrier 



The distribution of these species is given above, p. 122. 



One other species of Freyella exists in the North Atlantic 

 (taken at 62° 10' N., 19° 36' W., ca. 2060 m., "' Thor "). It is a 

 large, coarse, apparently undescribed form \\ith 11-13 arms, 

 resembhng Fr. Edwardsi in having the proximal adambulacral 

 spines widened and in lacking a furrow spine ; but it has no 

 naked dorsal interradial plate at base of arms ; the plates of the 

 dorsal side of arms with numerous small spines. (In Fr. Edwardsi 

 these are single or only a few together.) 



[Family Pedicellasterid.e] 



Rays five or more, short, tapering, or more elongate, slender, 

 not restricted at the base. Dorsal skeleton of arms reticulate, 

 forming very large, mostly rectangular meshes ; it continues to 

 the end of the arm. Adambulacral and marginal spines not 

 especially elongate. Both crossed and straight xDedicellariae 

 present. Tube -feet in two series. 



Sometimes the tube-feet may be somewhat crowded so as 

 apparently to stand in more than two series in the proximal part 

 of the arm ; but it is only apparently so ; a closer inspection 

 \v\W. show that they stand only in two series. 



Two genera are represented in the N.E. Atlantic. A third 

 genus, Gastraster Perrier, referred by Perrier to this family, is 

 here placed in the family Stichasteridae. A fourth genus, Ly taster 

 Perrier, with the only species, L. incequalis Perr., is, according to 

 uiformation from Prof. W. K. Fisher, only a young Coscin- 

 asterias tenuispinus (Lamk.). 



Key to the East Atlantic genera of Pedicellasteridce. 

 1. Lateral and dorsal spines rather elongate, slender, carrying at 

 their base or higher up a wreath of pedicellariae. Arms 8 or 

 more ....... Coronaster Perrier 



Lateral and dorsal spines not elongate, not with a wreath of 

 pedicellariae, these latter only occurring scattered. Arms 



5-8 Pedicellaster M. Sars 



K 



