WORMS. MOLLUSCA: 52. Echinus 246 
Walk. monum, diluv, 2. p. 181, tab. E, lii, f. 4. 
Ferf. der bafel. merkw 22. tab. 22. fig. I. 
Found hitherto among foffiles only. 
Gonsideus, Subconic with an elliptic circumference: fpaces and ave- 
nues ro, the latter tranfverfely grooved and porous at 
the margin, the former divided by a ftraight excavated 
‘future. 
Krein echanod. ed. lesk. p. 159. tab. 43; f. 2. 
Found as yet only in a foffile fate: protu>erances of the {paces 
thickly placed and furrounded by a circlé of granulationss 
bafe flat, grooved; vent circular. 
B. Vent placed beneath; mouth without tentacula. 
a. Bafe circular, in the periphery of which is the vent. 
* Allo ga» Spaces to, covered with numerous {mall white tubercles, 
lerus. the larger ones united by a ferrate future and tranf- 
verfely lineate, the leffer ones terminated by a torainen _ 
at the crown: avenues io, biporous. 
Plot. Oxforafh. § 35. tab. 2. fig. 13. . 
Morton Nortbnmptanfb. p. 235. m. 1. 
Luid. lithoph. Brit. p. 47. n. gg8, 959. 
Lesk. ed. Klein echinod. p. 102. tab. 13, A.B. 
Alsrov. Muf. metall. p. 455, figs 4. 
Desk. Gaxoph..coutin, tad. 19, 
Lang. lap. fig, p.125. tab..36, fig. 1. 
Mill. ech. wagrs p 7, fiz. Ó 
Breyn. ecb. p.§7. tab, 2, fig. 1, 2. 
Bourg petrif. p. 77. tab. 53, fig 36%. 
Found hitherto only in a foffile tate, — 
Suboval: mouth orbicular, imall: went ovate. 
Depreffus; Spaces 10, the larger ones divided ia the middle by a fu- 
ture; avenues 10, biporous: crown depreíled: vent 
orbicular. : y 
Klein echin. ed, lesk. p. 164. t. 40, f. 5,6. 
Walch diluu. monum. 2. p.180. t, E. à. f. 6j 7. 
/ Mell, ech. wagr. p. 7. 1-1, fr 2. ; 
Kundm,rar.nat.et art. 5, figs V2, 
Natorl. bafel. Merkw. 22. tab. 22, fig. H. 
Found hitherto only-in a foffile itate. 
- 
Mouth moderate, with 10 fharp finuofities; vent large, ovate. 
VOL. IV. — T *Vulgaris. 
