ECIIIXOCARDIUU. 171 



antero-lateral scries six to eight, and in the hinder from twelve to 

 fifteen ; the outer postero-lateral series has fourteen, and the inner 

 twelve ; but these numbers must not be taken to be quite constant ; 

 these ambulacra are about flush with the test. 



The periproct is an irregular oval, with the long axis at right 

 angles to a vertical line ; the subanal fasciole seems to include only 

 one pair of plates, which are triangular in form and have a pair of 

 pores at the outer apex of each triangle ; the spines carried on them 

 are more prominent than in E. cordatum; the bare ambulacral 

 spaces below are rather narrow. 



The tuberculation is a good deal finer on the upper than on the 

 lower surface, but on each, respectively, it is very uniform. 



Test. 



Distribution. Both sides of Atlantic, but known only from 

 Shetland, North Sea, English Channel, West Indies, and Florida. 

 Shallow water to 120 fms. 



a, b. Scilly Islands. 



c. Jersey. Prof. Bell. 



d, e. Jersey. 



3. Echinocardium flavescens. (Plate XYI. figs. 6 & 7.) 



Spatagus flavescens, O. F. Mull. Prod. Zool. Dan. (1776) p. 236. 

 Spatangus ovatus, Flem. Mem. Wern. Soc. v. (1824) p. 287, pi. vi. ; 



id. Brit. Anim. (1828) p. 480 ; de Bl. Actin. (1834) p. 202; 



Desml. Syn. (1837) p. 388. 

 Amphidetus ovatus, Dub. $ Kor. Vet.-Akad, Hdlg. 1844 (1846), 



p. 283, pi. x. fig. 50 ; Ay. $ Des. Ann. Set. Nat. viii. (1847) p. l2; 



Surs, Norg. Ech. (1861) p. 98; Pen: Ann. Sci. Nat. xiii. (I860) 



p. 70, pi. vi. fig. 2 ; Jarzynsky, Tram. Petersb. Soc. Nat. i. (1870) 



p. 319. 

 Echinocardium ovatum, Gray, Brit. Bad. (1848) p. 6 ; id. Cat. Bee. 



Ech. (1855) p. 43 ; Dvj. $ Hup. Echin. (1862) p. 602 ; Al. Ay. 



Bull. Mm. C. Z. i. (1869) p. 276. 

 Echinocardium flavescens, Al. Ay. Bev. Ech. (1872) pp. 110 & 351, 



pi. xx. figs. 3 & 4 ; Gauthier, C. B. lxxix. (1874) p. 402; Mob. $ 



Biitsch. JB. Comm. Kiel, ii. & iii. (1875) p. 150 ; Ludiviy, Mitth. 



Stat. Neap. i. (1879) p. 561 : Al. Ay. Chall. Ech. (1881) p. 175; 



id. Proc. B. Soc. Ed. xi. (1880-82) p. 698 ; Koehler, Ann. Mus. 



Marseille, i. 3. (1883) p. 129 ; Cams, Prod. Faun. Mediter. (1884) 



p. 103 ; Herdman, Bep. Faun. Liverp. Bay, ( 1886) p. 138 ; Barrois, 



Bev. Biol, i. (1889) p. 110 ; Scott, Proc. B. Phys. Soc.Edinb. 1890-91 



(1892), p. 82. 

 Amphidotus roseus, Forbes, Brit. Star/. (1841) p. 194; Thomps. 



Nat. Hist. Irel. iv. (1856) p. 4 12. 



Test rather oblongo-ovate than cordiform in shape : anterior 



