x6o . YVORMS. MOLLUSC A. 5 a. Echinus. 



Oralis Affiliate, oval; with 10 avenues and fpaces, the latter di- 

 vided by a ferrate future in the middle* 

 Kieiu. ecbin. ed, Lesk p. 253. tab. 41* fig. 5. 

 Annon. AH Helv. 4. p. 275. tab, l'^. fig. I — 3, 

 Walch dihlv Moium. z. p. \%z.tab. E, i'i fig 6. 

 Found hitherto only in a fondle itate, and is probably not of th'tf 

 divifion. 



Piriformis Ovate, and gibbous at one end ; the bafe flat : avenues 5, 

 fame What petal-fhaped and obfoletely porous. 

 Klein echin. ed. Lesk. p. 255. ta'>. 44.7%. 7. t. 5 I .f 5,6, 

 Found hitherto in a foflile itare only. 



Mouth and -vent round, the former iorncthing heart-fhaped an- 

 gular and 5-lipped. 



ttapifcancri Obtufely oval, convex: crown excentric and perforated 

 with 4 poies : avenues 5, biporous, ovate-lanceolate 

 and cleft at the tip. 



Klein echinod. ed. lesk. p. 2c6. tab 49, jig. 10, 11. 



Found as yet only in a fbilile ilare. 



Mouth as in the lait : <vent placed above the broader margin of 

 the fhell, mouth at the narrower end and nearer the bafe : bafe 

 flat, flight.y excavated, naked in the middle, elfevvhere covered 

 with a circle cf tubercles difpoled in rows. 



Paiillari: Very much depreiTed ; with avenues refembling a ftar. 

 Klein* echinod. ed. lesne, p. 256. lab. 53,/g. 5 — 7 • ' 

 Found on I) in a fofiile fUte: circumference ovate ; back a little 



convex* the bafe ilight'y excavated; /ides granulate: mouth 



orbicular. 



. 



ORDER 



