ECHINODERMATA. 
549 
obsoletely waited ; beset with short violet-eoloured spines. 
Four inches in diameter. Inhabits the European seas. 
Genus 9. — SPATANGUS.— Lamarck. 
Generic Character —With an irregular, heart-shaped, subgib- 
bous shell, covered with very small spines ; having four or five 
unequal compartments ; mouth simple, transverse, and provided 
with lips approaching the margin - } anal orifice lateral, and op¬ 
posed to the mouth. 
Spatangus purpureus. — The Purple Spatangus. 
Plate XCV. fig-. 6. 
Heart-shaped, with four lanceolate compartments, which are 
placed, with the larger tubercles, in a zigzag form. Inhabits 
the European seas. 
Section III. — Stellerides. 
Having a coriaceous skin, which is not irritable, but move- 
able in particular points, with a short depressed body, which is 
broader than long, with angulated or marginal lobes, differing in 
number, radiating from the body and moveable ; no anal orifice. 
It has the following genera:—16. Asterias; 17. Opkiura ; 18. 
Euryale ; and 19. Comatata. 
Genus ASTERIAS.— Linnceus. 
Generic Character. — With a suborbicular depressed body, 
its circumference divided into angles, lobes, or rays, each of 
which has a longitudinal furrow in its centre, fringed on each 
side with moveable spines, and orifices for the tubular or retrac¬ 
tile feet; mouth central, and placed below, at the union of the 
grooves. 
Asterias ruhens. — The Red Star-Fish. 
Plate XCV. fig. 9. 
With five lanceolate, papillous, and spinous rays \ papilla} of 
the back scattered, and set nearly in rows. Inhabits the Euro¬ 
pean seas. t 
