414 Proceedings of the Royal Physical Society. 



12. Echinus melo, Lamarck. 



. 1816. Echinus mclo, Lamarck, Hist. anim. s. vert., iii., p. 45. 

 1834. ,, ,, Blainville, Man. d'ActinoL, p. 226, pi. xx., 



figs. 3, 3a, Zh. 

 1872-3. ,, ,, Agassiz, Rev. Echin., pp. 124, 493. 



1884. ,, ,, Carus, Prodr. faun. Medit., i., p. 100. 



Diagnosis. 

 Test globular ; actinal opening smaller than in E. acutus ; 

 greenish-yellow in colour, red and pink in E. acutus ; principal 

 row of vertical primary tubercles small ; more secondaries than 

 in E. acutus; horizontal sutures bare both in ambulacral and 

 interambulacral area, forming a lozenge-shaped pattern lighter 

 than the main colour of the test \ primary spines more closely 

 striated than in E. acutus^ and genital openings not so near the 

 edge of the plates ; median vertical sutures of ambulacral and 

 interambulacral spaces forming a distinct double zigzag line, 

 diminishing in breadth towards either pole. 



Distribution. 



British Seas.—0& North Bona, "Knight Errant," St. 3, 53 

 fms. (Agassiz, 4). Cornwall (Forbes, 3). 



Other Localities. — Coast of France (Barrois). Off Portugal 

 (Thomson, 2). Mediterranean (Ludwig ; Carus ; Manchester 

 Mus. ; Coll. Norman). Canaries, Cape Yerde Is. (Agassiz, 5). 



This species is very near E. acutus, and it is very doubtful 

 whether it is more than a globular variety of this latter. It is 

 very desirable that further evidence should be obtained as to its 

 occurrence in British waters. 



1 3. Echinus elegans, Dtiben k Koren. 



1844. Echinus elegans^ Diiben & Koren, Skand. Echin., p. 272, pi. 



X., figs. 40-42. 

 1872. ,, ,, Agassiz, Rev. Echin., pp. 122, 491, pi. vna., 



fig. 4. 

 1874. ,, ,, Wyv. Thomson, "Porcupine" Echin., Phil. 



Trans., p. 744, pi. ixviii., figs, 11-13. 

 1889. ,, ,, Bell, Ann. and Mag. Nat. Hist, (6) iv., pp. 441, 



442, pi. xix.,figs. 2, 3. 



Diagnosis. 

 Test hemispherical, reddish, with ten red stripes extending 

 from the apex to the equator; twenty very distinct series of 

 primary tubercles, not interrupted ; spines very long, acute 



