( 92 



aperture in the top of the fliell, 

 out of which the creature voids its 

 excrements. Thus much of the 

 general ftrudlure of the creature 

 may ferve alfo as part of the de- 

 fcriptions of the fucceeding fpecies, 

 for they all agree in general in 

 thefe particulars. 



Echinus Saxatilis. Linn. No. 



6. The Rock-Sea Urchin. Plate 

 'XI. Fig. 2. Hemifpheric and 

 deprefled; with ten avenues, ap- 

 proximated in pairs, the areze lon- 

 gitudinally verrucofe. It dwells 

 in the Mediterranean Sea. 



Echinus Diadema. Linn. No, 



7. The Imperial Crown Sea Ur- 

 chin. Plate XI. Fig. 3. He- 

 mifpheric and deprefled j the ave- 

 nues five in number longitudi- 

 nally verrucofe, the areas lanceo- 

 lated. It inhabits the Indian Seas. 



Echinus Cidaris. Linn. No. 8. 

 The Turban Sea Urchin. Plate 

 XI. Fig. 4. Hemifpherically de- 

 prefl*ed, with five lineary avenues 

 bent back, the arose alternately di- 

 vided into two. It dwells in the 

 Ocean. 



Echinus Mamillatus. Linn. 

 No. 9. The Mamillated Sea Ur- 

 chin. Plate XI. Fig. 5. He- 

 mifpherically oval, with ten wind- 

 ing avenues; the areae muricated 

 and verrucofe, the narrowed: beins: 

 alfo abbreviated. Its dwelling is 

 the South Seas. 



) 



que nous venons de dire de la 

 ftrufture generale de I'animal pent 

 aufli fervir a decrire les efpeces 

 fuivantes, car elles s'accordent 

 toutes en ces particularites. 



Le Herlflbn des Roches 

 Hemifpherique & applati, a dix 



avenues, rapprochees par paires. 



Les efpaces longitudinellement 



converts de verrues. II habite la 



Mer Mcditerrane'e. 



Le HerifTon Diademe. 



Hemifpherique & deprime, a 

 cinq avenues, longitudinellement 

 munies de verrues ; les efpaces con- 

 verts de pointes en maniere de 

 lances. Se trouve dans I'Ocean 

 Indien. 



Le HerifTon de Mer en Turban. 



He'mifpheriquement deprime, a- 

 vec cinq avenues lineaires repliees, 

 les efpaces alternativement divifes 

 en deux. II habite I'Ocean. 



Le HerifTon a Mammelles. 



Hemifpheriquement oval, avec 

 dix avenues tortueufes ; les efpaces 

 c'pineux et garnis de verrues, les 

 plus etroits fe trouvant aufli rac- 

 courcis. II habite dans I'Ocean 

 du Sud. 



Echinus 



