f 3 6 WORMS. MOLLUSCA. 52. Echinus- 



Thefe are all inhabitants of the Sea, and many of thefn ., 

 been hitherto found in a foflile ftatc : many are efculent, asud 

 they arc in general armed with c fharp teeth: the pores are 

 each furnifhed with a retractile tenaculum or feeler, by which' 

 the animal affixes itfelf to any object and Hops its motion: 

 the fpines are connected to the outer flcin by very ftrong 

 ligament?, and are the inftruments of motion. 



A. Vent Vertical: tent acula ei)erj where fimple. 



k, Hemifpharical or globular. 



* Efeukntus Subglobular; with 10 avenues of pores, the fpaces between; 

 covered with fmall tubercles fupporting the fpines. 

 Naiur, Mi/cell. tab. 223. Barbut. tab* H.fsg, I. 

 Lifter Angl. 69 tab. $.fig 13. Brit. Zool. iv. /. 34. f. 74. 

 Klein echinod. ed. Left. p. 76. tab. 38, f. I» 

 Rum pf Mufjjgf. tab. 13 fig. B, C. 

 Seba Muf. 3. tab, 1 i.fig* 4. a, b, /. 12. f. 1, 6, 8, 9. 

 Argen*v. Concb t p. 307. tab. 25. fig. F. 

 Delic Nat.fel. tab. D.fig. 1. t.D. ii. f. 1; 



1. Sela Muf. 3. tab, \6.fig. 14. 



2. Seba. Muf 3, tib it. fig. 6. 



3. Seba Muf 3. tab. ll.fgm 7. 



/. Seba. Muf % 3. tab. 11. fg. 9.' 



5. White. Molin.Uid.Chili.p. 1 75, 

 Inhabits European and Indian Seas. 



Body reddifh or yellowiih : _$*»« fhort violet colour, loofingthei/ 

 colour and falling off the dead animal : pores in about 3 rows: 

 tubercles furrounded with a circle of leffer ones : vent clofed by" 

 a coriaceous membrane covered with fpines. 



Sphara, Subfphasrical, red, with blueiflr fpines. 



Inhabits Northern Seas. Mull, Zool. Dan.prodr. 284^ 

 Is probably the fame as the laft, or Ech, fardicus. 



Drxbacki- Hemifphaerical, pale, with long pale fpines. 

 enfis. Inhabits North Seas. Mull, Zool. Dan, prodr. 2846. 



* Miliaris. Hemifphasrical depreflfed, with 10 auenues of pores, the 

 fpaces between with 2 rows of protuberances. 

 Klein, Echin, ed. Left. tab. 2.. A, G, D. tab 31. A, D. 

 Sloan Jamaica. 2 p. 268. tab. 244. Jig. 1— 3« 

 Seba Muf 3./. iB. tab. 10, fig. I — 4 fab, 1 1, fig. 5 — S t 

 Del. Nat. I, tab. D. ii. fig. 3, 4, 5. tab. D, in. fig. 4. 

 Gualt. left, tab* 107. fig. G, H, I,L, K, 



