PLATE IX. 

 Pal^aster sh^ffeei, Hall. 



Page 326. 

 Fig. 1. Ventral side, showing the ambulacral, adambulacral and marginal ranges of plates. 



Pal^asteb. matutinus, Hall. 



Page 325. 

 Fig. 2. Dorsal side of a specimen of this species. 



Palmastee eucbaris. Hall. 



Page 330. 

 Fig. 3. Dorsal side of a specimen, a. The madreporiform tubercle. 

 " 3* View of the ventral side. 



" 3o. An illustration of a single ray, with the centre and bases of the other rays. The let- 

 ters refer to the parts as follows : 

 a. Ambulacral plate ; 

 p. The pore; 

 aa. Adambulacral plate ; 

 m. Marginal plate ; 



tm. Terminal plate of the marginal series ; 

 0. Oral plates, of which there are five pairs. 

 " 4. A single ray, deprived of its marginal plates and flattened, showing a great length of the 

 ambulacral plates. In flg. 3a, the concavity of the groove produces a shortening of the 

 plates of the ambulacral series. The letters refer to the same parts as those of flg. 3a. 



Protaster forbesi, Hall. 



Page 336. 

 Fig. 5. View of the ventral side in outline ; natural size. 

 " 6 An enlargement of the lower side of a part of one ray, illustrating the parts as follows ; 

 0. Oral plate; 

 p. The pore ; 

 a. Ambvilacral plate; 

 aa. Adambulacral plate ; 



s. Spine from anterior end. of adambulacral plate; 

 d. The limit of the circular disc. 



EUGASTER LOGANI, HaLL. 

 Page 333. 



Fig. 7. Specimen of the natural size. 

 " 8. A portion of one ray enlarged, with references to the parts as foUows : 



0, 0. The oral plates, of which there are five pairs, the apices of each being 



apparently joined by a suture to the basal portions, 

 a. Ambulacral plate ; 

 aa. Adambulacral plate ; 

 p. The pore ; 

 s. The spine; 

 d. Limit of the disc. 



