POLYPI. 
563 
rarely lobed ; upper surface crowded with orbicular or subangu- 
lar lamellar, or sessile stars. 
* With the stars separated from the base. 
Astrea radiata .—The Rayed Astrea. 
Plate CIV. fig. 10. 
Stars orbicular; interstices sulcated. Inhabits the American 
seas. 
** With contiguous stars. 
Astrea denticulata. —The Toothed Astrea. 
Plate CIV. fig. 17. 
Stars unequal, cells contiguous. Inhabits the Indian ocean. 
Genus 19. — EXPLANARIA.— Lamarck. 
Generic Character. —Stony, fixed, exhibiting a free foliaceous 
membrane; waved and sublobate, with one of its surfaces stel- 
liferous ; stars scattered, sessile, separated at different degrees 
of distance. 
Explanaria rosularia. —The Rosularia Explanaria. 
Plate CIV. fig. 3. 
Depressed, foliaceous, and suborbicular. Inhabits the Austra¬ 
lian seas. 
Genus 22. —ME AND RINA.— Lamarck. 
Generic Character. —Stony and fixed, disposed in a simple, 
convex, or hemispherical mass, with a convex surface, divided 
by hollow sinuous compartments, which are provided on each 
side with transverse parallel plates, which are attached to the 
raised crests. 
Meandrina labyrinthica. —The Labyrinth Madrepore. 
Plate CIV. fig. 19. 
Hemispherical; undulations long and tortuous; base dilated ; 
menerus simple and subacute. Inhabits the American seas. 
