WORMS. MOLLUSCA. 52. Echinus. 



155 



\Fab 



a» 



Inequalis* 



vianmus. 



Pbelf, Zee-egel p. 134. tab. z. fig. 13-15. 



Pall, Spirit. Zool. 9. p. 34. tab, l.fig. 25. 



Found frequently on the Tandy coails of the Netherlands* 



Mouth orbicular. 



Surface and bafe pulvinate: circumference obtufely oval; 

 fides hardly grooved : avenues flat: crown a little pro- 

 minent and central. 



Pbelf. Zee egtl. tab. 2, fig. 1 6**20. 



Klein echinoa.ed. Lesk.p, 216. tab* 37. fig. 6, 



Delic, Nat,feL \.p. 90. tab. D Lfig. 10. 



Inhabits— —Size of a pea, ochraceous and granulate. 



Surface gibbous Ort the fore-part, the hind-part flat and 

 Hoping; circumference oblong-oval and nearly pen- 

 tangular: bafe globular and a little narrowed: fides 

 grooved: avenues fubpulvinate : crown central. 



Pbelf. Zte egeL tab. 2, jig, 2 1— 25. 



Inhabits— — *-*Back unequal. 



Surface globular and more (loping behind, circumference 

 acutely oval: bafe globular: fides grooved; avenues 

 fubpulvinate : crown central. 

 Pbelf. Zee-egel. tab* 2. fig, 25—30. 

 Inhabits — —probably a variety of Ech, minutus. 



htfinius* Surface globular, circumference ovate heart- (haped and 

 fubtrigonal : bafe pulvinate : fide. 1 (lightly grooved : 

 avenues pulvinate : crown nearly central. 

 Pbelf Zee-egel. p. 1 36. tab, 2- fig* 3 1 — 36. 

 Inhabits— —probably a variety of Ech. minutus. 



C. Vent lateral*, mouth with pencilled tent acula, 



a. Circular ; mouth central : vent fquafe\ 



Placenta, Subconic, with 10 fpaces alternately narrower: avenues 5, 

 lax flat and gaping at the tip. 



Bar but tab. ll,fig. it. Rumpf. Amb. tub, \\*fig. G. 



Klein echin. ed. Lejk. p* 21 7. tab, 20. A, B« 



Petiv. Amb, tab, II, fig. 5. Gualt. teji. t. flo.f.G, 



Bnyn echin. p. 64. tab. 7. fig. 7, 8. 



Seba Mufi $,tab. l$tfig* 21, 22. 



Inhabits the Southern Ocean ; a little convex and and conoid ; the 

 circumference lbmewhat angular; the bafe flat : Jpaca divi- 

 ded by an obtufely toothed vertical line; vent placed on the 

 furface and nearly marginal. 



U 2 b. Heart- 



