Echinocyamus. RADI at a. CATOCYSTI. 481 
Upwards of three inches in diameter ; purple. Oviducts approximating 
with the punctured space behind. Vent transversely oval. Inclosed space 
beneath reniform. Two anterior avenues of pores abbreviated. Primary 
tubercles, with a central ligament, a moniliform ring at the base, and dis- 
posed in waved lines. 
EXTINCT SPECIES. 
1. S. cor-anguinum. — Cordate, subconvex, with five grooves, each with four 
rows in pairs Echinites cordatus, Lind. 47. t. xii. f. 964. — S. cor. Park. Org. 
Rem. iii. 28. t. iii. f. 11.— Common in Chalk. 
2. S. rostratus. — Cordiform, dorsal ridge rostrated, anterior part of the shell 
depressed.— Geol. 192. t. xvii. f. 10-17 — In Chalk. 
3. planus — “ Ovate, vertex rather depressed ; surface nearly smooth, ivith 
eight ? biporous ambulacra, diverging in pairs on each side the back and firont, 
dorsal groove superficial, extending to the mouth ; base slightly convex ; 
- mouth "transversely reniform ; vent placed in the upper part of the side.” — 
Mant. Geol, 192. t. xvii. f. 9-21. — In Chalk. 
CATOCYSTI. 
Gen. V. ECHINOCYAMUS. — Ovoid/margin rounded ; ave- 
nues of pores short and biporous ; mouth and vent adjoin- 
ing. 
9. E. pitsillus. — Body ovate, slightly concave round the 
mouth, and subdepressed above. 
Spatagus pusillus, Muller., Zool. Dan. iii. p. 18. tab. xci. f. 5, 6. — Echinus 
ovalis depressus ambulacris quinis. Walker's Test. Min. p. 25. tab. iii. 
f. 88. — Ovulum marinum, Iseve, minimum, figurse compressse, Bor. 
Corn. p. 278. tab. xxviii. f. 26. — Common on all parts of the coast, from 
Devon to Zetland. 
The margin of the mouth is irregularly notched. Where the avenues 
meet there are four large pores, the orifices of the oviducts. — Muller states 
the size at nine lines. I have not found it exceeding two lines, nor ever 
alive. In some the vertex is prominent, and the avenues of pores indistinct, 
and they likewise exhibit differences in the disposition of the tubercles. 
Is the “ Echinus suhrotundus planus hiatus^ the flat roundish lobated Echi- 
nus, the colour opaque, white, from Reculver, very rare,” of Walk. Test. 
Min. 25. t. iii. fig. 89, an Echinocyamus ? I am not aware that it has come 
under the notice of any recent observer. 
Gen. CONULUS. — Conoid, vent lateral. 
1. C. albogalerus — Obscurely pentagonal, divided by ten biporous avenues 
into five large and five very small compartments ; surfaces covered with mi- 
nute granulse ; vertex with five perforations.— ParAr. Org. Rem. iii. 19. t. ii. 
f. 10, \\.— Mant. Geol. 190. t. xvii. f. Chalk. 
2. C. vulgaris.-m..Park, Org. Rem. iii. t. ii. f X.-.-.Mant, Geol. 191.— In Chalk; 
Hh 
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