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ipa WORMS. MOLLUSCA. 52. Echinus. 
Owalis Affulate, oval; with ro avenues and fpaces, the latter di- 
. vided by a ferrate future in the middle. 
Klein. echin. ed, Lesk. p. 253. tab. 41° fig. 5. 
Annon. A8. Helv, 4. p. 275. tad, an Fg. po 
Walch diluz. Manum. 2. p. 182. tab. E, iii. fig. 6 
Found hitherto only in a foffile ftate, and is od. not of this 
.divifion. 
Pyrifurmis Ovate, and gibbous at one end; the bafe flat: avenues c, 
fomewhat petal-fhaped and obfoletely porous. 
Klein echin. ed. Lésh. p. 255. tab. 44. fig. J. t. g1. f. 5:6 
Found hitherto in a foffile itate only. 
Mouth and vent round, the former fomething heart-fhaped an- 
gular and 5-lipped. 
Lapifcancri Obtufely oval, convex: crown excentric and perforated 
with 4 pores: avenues 5, biporous, ovate-lanceolate 
and-cleft at the tip. 
Klein echinod. ed. lesk. p. 256. tab. 49» figs 10, 11. 
Found as yet only in a fofiile fate. 
Mouth as in the laft: went placed above the broader margin of 
the fhell, mouth at the narrower end avd nearer the bafe: Z2/ 
flat, flightly excavated, naked in the middle, elfewhere covered 
with a circle of tubercles difpofed in rows. 
Patillaris Very much depreffed; with avenues refembling a ftar. 
Klein, echinod. ed. leskey p. 256. tab. $3, fig. 5—7- 
Found only in a foffile ftate: circumference ovate; back a little 
convex, the bafe flightly excavated; fides granulate: mouth 
orbicular, 
ORDER 
