WORMS. MOLLUSCA. 52. Echinus. 153 



Otlodafiy- The fore-part orbicular and perforated with 2 foramina, 

 l oS0 the hind-part 8-toothed: avenues lanceolate. 



Klein, eebwod. ed. Lesk % p. 211. tab. 22. fig. G, D. 

 Brcyn echin.p. 64.. tab. 7 fig. 5, 6. 

 Gualt.teft. tab, no. fig' F. 

 2- Margin I o-toothed. Seba Muf. 3. ta£. 15./^- *5> *"* 



Inhabits- &&<?// whitim-afh ; affulate, the pieces convex; 



crown umbiiicate : a<ver„ues emarginate. 



Qrbiculu* P° re -P art orbicular entire, hind-part unequally toothed; 

 avenues lanceolate cleft and bent. 



Klein echin.ed. Lejk p. 212. tab. 22' fig. E, F, 



Rumpf. Amb. tab. \\.fig* I- 



Breyn. echin. tab. J.fig^ 3> 4* 



Bocc. ebferv. p. 273. /?£. 15. 



Valent. Muf. l> p. 1 77. $£. 2. 



Argentuille Conch 2, ta£. 7- fig. V>. 

 2. iC/«« echihod. ed, Lejk. tab. ^. fig. 6, 7; 



S*£tf. M«/. 3. ta£. IS-,/^- 19? 20. 



Inhabits the Indian Sea. Shell 'Sat, fuborhicular, not perforated, 

 compofed of hexanguhr pieces the bafe flat with iiaprefled 

 grooves: avenues oval : mouth rounded : w/tf.oval. 



g. /^7i7? 10 avenues on the crown y the rays Jjraight b^porous 

 and (lellate : mouth and vent approximate in the middle 

 part of the bafe. 



NucUus. Surface globular, with an orbicular circumference: bafe 



narro w and flat in the middle : fides grooved : avenues 



puivmate: crown excentric 

 Phef. Zet-egel. p. 1 3 1 » « I. tab. i.fig> i — C. 

 Kiein. Lchiu. ea Lejiit >J>. 2 i 3. tab. 48. 2a. 2 e. 

 InHaDits— - — Shell yellow lfii-am : crown perforated with 4 pores; 



mouth circular: <vent rather oblong and fmaller man the 



iiioutiv. 





Centralis. Surface globufar, circumference fuborbicular: bafe pulvi- 

 nate : fides very lightly grooved: avenues flightly pul~ 

 vi'nate: crown central. 



Phef. Zee-egel. p. 131. n. 2. tab, i.fig.6 — 10. 



Inhabits peihaps a variety of the laft. 



Mcntb very minute and orbicular, 



Er-rjum. Surface globular^ circumference fuboval: bale a little riar- 

 rowed: fides grooved: avenues fubpulvinate: crown 

 central. 



VOL. IV.— U Pbelf* 



