1 $ M ADR] 
18. Madrepora filograrta : ftem none; fimple, with a 
very thin Terpentine labyrintbic ftar, an acute future, 
and fiat perforated''fpaces. Found in the Indian Ocean. 
19. Madrepora natans: fimple, without ftalk ; ftar fer- 
pentine, labyrintbic, with the difks of the undulations 
very broad; future obtufe, coral porous. Inhabits the 
Indian and American Seas. 
ao.'Madrepora anthophyllum : fimple, with an ovate 
ftalk; ftar terminal, hemifpherical, concave, with radiate 
thicker gills at the bottom. Inhabits the Mediterranean. 
• III. With numerous united Stars. 
it. Madrepora labyrinthica : ftalk none ; ftar with Ter¬ 
pentine undulations, and obtufe future. Found in India, 
and likewife in South America ; very variable in form, 
and frequently many feet in diameter. In the Caribbee 
ifiands it is often burnt into lime. See Plate III. fig. 13. 
22. Madrepora finuofa : with fpreading, ftiort, flexuous 
Undulations, and unequal jagged diffepiments, the promi¬ 
nent undulations mofily doubled ; gills denticulate. In¬ 
habits South America. 
23. Madrepora meandrites : without ftalk ; the ftar with 
Terpentine undulations and acute future. The undula¬ 
tions are larger and loofer than in the labyrinthica, and the 
fubftance is more folid, and nearly ftony ; the centres of 
the ftars radiate with thick gills. Inhabits South Ame¬ 
rica and the Mediterranean. See fig. 14. 
24.. Madrepora areola : without ftalk; the undulations 
are dilated, and in fome places doubled, with narrow 
truncate margin ; gills crenate. This is found in India 
and South America ; is of a rofy colour, and fmooth be¬ 
neath. See fig. 15. 
25. Madrepora abdita : fubglomerate, with ftar-fhaped 
angular obconic foliations and fimple undulations; gills 
narrow, with crenulate teeth. This is thought to be a 
variety of the favofa, N°_36. 
26. Madrepora phrygia: with long narrow undulations, 
and perpendicular prominent ones ; the diflepiments Am¬ 
ple, lamellate, lobulate ; gills rather remote. Found in 
the Southern Ocean. The undulations are fometimes 
ftraight, and fometimes flexuous. See fig. 16. 
27. Madrepora repanda: with prominent thickened 
undulations; the diflepiments Ample and hardly united ; 
gills numerous, moft of them thickened within. 
28. Madrepora ambigua: undulations ftar-fnaped and 
flexuous, the prominent ones thickened, diflepiments Am¬ 
ple and thickifh ; gills diftant. 
29. Madrepora daedalea : with deep ftiort undulations, 
and perpendicular prominent ones ; the diflepiments jag¬ 
ged ; gills ferrate. Found in the Eaft-Indian Ocean. 
30. Madrepora gyrofa: cellular, with doubled foliaceous 
prominent undulations, and fimple diffepiments; gills fo- 
Jiaceous and equal. This is one of the fmootheft and 
snoft elegant of the fpecies, and covered with numerous 
cells. See fig. 17. 
31. Madrepora clivofa : undulations narrow at the bafe 
with equal diflepiments ; the prominent ones fimple and 
thickifh; gills alternately abbreviated. Inhabits South 
America. 
32. Madrepora cerebrum, or brain-ftone; nearly globu¬ 
lar, with very long tortuous undulations, and ending with 
flattifh prominent ones. It differs in fize from two inches 
to two feet in diameter. 
33. Madrepora involuta: undulations dilated at the 
bafe, and fhort, with nearly equal diffepiments; the pro¬ 
minent ones fimple. 
34. Madrepora implicate: undulations rounded, and 
steady perpendicular, with equal and broad diffepiments; 
•the prominent ones are doubled and broad. 
35. Madrepora cochlea: undulations fpiral; the ftar 
■with a punctured centre ; rays, ferrulate. It inhabits 
Tranquebar; and is a fpecies that is between the orders 
Tefiacea and the Zoophyta. 
: p o 11 a. 
IV. Aggregate, undivided, with difcinB Stars, and ' pondous, 
tuberculous, prominent, undulations. 
36. Madrepora favofa : ftars angular, concave, connected. 
It is white, and ftriate at the fides; when divided trank 
verfely, it appears reticulate, with unequal pores and 
fpots; gills toothed. Inhabits the Indian Ocean. See 
Plate IV. fig. 18. 
37. Madrepora cavata : fubglomerate, with ftar-fhaped 
angular undulations, and fimple narrow divifions ; gills 
denticulate. c 
38. Madrepora bulliens: ftars diftant, round, or oblong, 
unequal and elevated at the margin ; the interftices are 
formed with fomewhat-concave radiate wrinkles. 
39. Madrepora ananas: annular convex ftars, concave 
on the difk. It inhabits the Mediterranean and South- 
American Seas, and is frequently found in a foftile ftate. 
It is gibbous ; and, when differed tranfverfely, refern- 
bles a white net with hexangular fpots, including a 
white ring, and ftriate between the net and the ring. We 
fig. 1-9. 
40. Madrepora hyades: with crowded, obconic, round¬ 
ed, and fome what-angular, ftars, and thick porous divi¬ 
fions ; the centres flattifh and convex. 
41. Madrepora fiderea ; with crowded, rounded, angu¬ 
lar, ftars, and thick, rather-convex, divifions; alternate 
gills nearly united at the margin ; centres fimple. See 
fig. 20. 
42. Madrepora galaxea: crowded impreffed ftars, and 
thick, flattifh, nearly-diftinfl, divifions; gills very thin, 
the centres a little worn. The gills are formed by fours, 
reaching to the centre ; the three intermediate ones are 
connivent at the bafe-. See fig. 21. 
43. Madrepora pleiades: ftars roundifli, with acute ele¬ 
vated margins; the interftices are concave, finoothifh, and 
in fome parts a little cavernous. See fig. 22. and fome of 
the ftars magnified at fig. 23. 
44. Madrepora papillofa: fomewhat aggregate; ftars 
cylindraceo papillous, with thickened, rounded, oblique, 
margins. It refembles the muricata, of which it may pro¬ 
bably be the embryo ; but the papillae are contiguous, and 
difpofed in a Angle row. 
45. Madrepora radiata: ftars cylindraceous, with ele¬ 
vated margins; the interftices broad, concave, and radiate 
with grooves. 
46. Madrepora latebrofa: ftars roundifh, with many 
rays and elevated margins; the interftices are radiate with 
grooves, a little narrowed and unequal. Found in the 
Weft-Indian ifiands. 
47. Madrepora polygona: with minute crowded ftars, 
intermixed with larger perforated ones; the bottom con¬ 
cave, cylindrical. It inhabits the Indian Sea, and refeni- 
bles a white cruft about two inches thick. The fmaller 
ftars are minute, rather obtufe, and twelve-rayed ; the 
larger ones as big as the end of a finger, more gibbous, 
with an empty cavity between them. 
48. Madrepora arenofa.: with contiguous flattifh ochra- 
ceous ftars. Found in Algira. 
49. Madrepora interftinfta : with round, diftant, im- 
merfed cylindraceous, ftars; the interftices porous. In¬ 
habits India, America, and Norway. 
S®. Madrepora fpongiofa: fomewhat dilated, with craggy 
foliations, obtufe above and flat beneath; ftars funnel- 
formed', deep, and unequal. 
51. Madrepora foliofa : dilated, with foliations fome¬ 
what craggy and verrucofe above, beneath flattifh4 ftars 
unequal and fmall. It is found in the Indian Ocean, 
52. Madrepora porculata: ftars obconic, with acute 
margins, and in fome places remote; the interftices are 
fmooth, and the gills every-where granulous. It is very 
rare, and of a greyifh-white colour. 
53. Madrepora- ftellulata :-,with round, diftant, equal,, 
cylinders of ftars elevated at the margins; interftices ra¬ 
ther flat and rough. 
54. Madrepora 
