WORMS. MOLLUSCA. 52. Echinus, *4S 



Walk, monum* diluv. z. p, 1 81, tab. E, iii. f. 4, 

 Verf. derbafel. merkw 22. tab. 22 fig. I. 

 Found hitherto among fbiSles ooly. 



Zoimdm. Subconic with .an elliptic circumference : fpaces and ave- 

 nues 10, the latter tranfverfely grooved and porous at 

 the margin, the former divided by a ftraight excavated 

 future. 



K-ein echondd. ed. lesk p. 1^9. tab. 43>/* 2. 



Found as yet only in a foilile {late : proru^ennces of the fpace* 



thickly placed and furrounded by a circle of granulations; 



bafe Hat, grooved : vent circular, 



B. f^ent placed beneath ; mouth without tent acula* 



a. Bafe circular f in the periphery of which Is the Vent* 



*Mo ga- Spaces 10, covered with numerous fmall white tubercles, 

 /eras. the larger ones united by a ferrate future and tranf- 



verfeiy lineate, the lelfer on s terminated by a foramex? 

 at the crown : avenues 10, biporous. 



Plot. Oxfordfh. § 35, tab. 2. fig. 13. 



Morton riortbnmptonjh p 235.^.1. 



Luid. lithopb Brit, p 47, #.958, 959. 



Lesk.ed* Klein echinod p. 162 tab. 13, A. B - 



Aldrcm. Muf. met all p 455>./%»4- 



Best. Gczoph. conti?!* ta'>. 19, 



Lang, lap. fg % p. I 25. tah. 36, fg, I. 



Mill. ech. >uuagr t p 7, fig, 6. 



Breyn. ecb.p.^j. tab. 2, fig. 1, 2. 



Bourg pet t if p ~j tab $hfg 36 1 j 



Found hit-hertq only in a f -Ifiie Kate. 



Suboval : mouth orbicular, imidl : went ovate. 



■Oeprefus. Spaces 10, the larger ones divided. in the middle hf a fu- 

 ture: avenues 10, biporous: crown deprefTed; vent 

 . orbicular 

 Klein echln. ed* lesk. p t 164. /. 40, f £,6, 

 Walch diiwv. monum 2. p. I 80, t s E. ii f 6, 7. 

 Mell. ech. <wagr. p.j. t. l,f 2. 

 Kundm* rar. nut et art. 5, fg. 12, 

 Naittrl. bafel. Merkvu. 22. tab. 2 2, fig. H. 

 Found hitherto only in a foffiie itate. 

 Mouth moderate, with 10 fharp linuofities; *verj large, ovate* 



VOL. IV, — T ^Vulgaris: 



