WORMS. MOLLUSCA. 52. Echinus. 139 
Shell greenifh-afh a little inclining to chefnut, and pulvinate at 
the bafe: pares with 4 tubercles placed in a rhombic form: 
pores of the avennes curved, in 4 or 5 pairs, 
* Ovarius, Ovate ; the larger {paces bifarioufly tuberculate. 
Plot. Oxfordfh. p. 108 tab. §, fig. 6. 
Laid, lithoph p. 46. n. 934—949. tab. 9, fig. 940. 
Bourg Petrif. p. 76. 1. 340. tab. 52, fig. 340, 345, 346, 
Found in a petrified flate in Exgland and Normandy. 
\ 
Diadema, Hemifpherical, depreffed, with 5 avenues longitudinally 
tuberculate ; the {paces lanceolate. 
Klein ed. left, tab. 37. fig. 1, 2. tab. §1, g. 1, ge 2. 
Barbut, tab. 11, fg. 3..— Petiu. Amb. tab. 8, fig. 5. 
Rumpf, Muf. p. 35. tab. 13, "n. 5. tab. 14. f. B. 
2. With tuberculate bands, Phels. Zee-egel. p. 29, s. 27. 
3. Greenifh-yellow, Seba Mu/. 3. tab. 11, fig. 10, 
4. Blackith, variolous, with long fpines. 
Seba Muf. 3. tab. 13, fig. 5. 
5. Klein. echinod. ed. lesk. tab, 46, ftg.1. 
6. Spines black annulate with whlte. 
Klein echinod. ed. lesk. p. 101. 
Inhabits fands of the Indian Ocean, 
Shell orbicular, with a deprefled top, rich blue or grey-blue: 
mouth \arge : vent circular and furrounded with a pentangular 
fkin : fpaces bifarioutly tuberculate, the tubercles perforated at 
the tip: avenues with 3 pair of pores at the bafe and 1 at the 
tip: /pines violet and blue-grey, 
Calamariu; Spheroid, deprefied: avenues 5, with black porous margins, 
granulate in the middle with a double row of larger 
prominent dots. 
Pall. Spicil. Zool, YO. p. 31. tab. €, fig. 4—7. 
Klein ecbinod. ed lesk. p. 115. tab. 46, fig. 1—4. 
Inhabits the Lndian Sea: greenifh-white. 
Leffer subercles with green very brittle briftles: pines refembling 
the ftem of the Equifetum, whitifh annulate with green and 
grey at the tip. 
P d 
Araneifor. Orbicular, grey, with purple-grey fpines thicker in the 
mi. middle. 
Inhabits American Seas. Seba Muf. 3, tab, 13, fig, 6 
- relatu, With the lower {pines capillary. 
Inhabits American Seas, Seba Muf, 3, tab. 13, fip, 7. 
S2 Radiatus. 
