410 POLYPI. 
appearance of having stars along the branches as well as at the 
end(1). In 
Maprepora, Lam. 
Or his Madrepores proper, the whole surface is roughened by 
. little stars with projecting edges(2). 
In his Pocittopora we observe little impressed stars with pores 
in the intervals(3). 
In his Srrratopora, these little stars are disposed in linear 
ranges(4). 
AstTREA, Lam. 
A broad surface, usually convex and excavated by crowded stars, 
each containing a polypus furnished with numerous arms, but on a 
single range, in the centre of which is the mouth(5). 
When it is a plane surface, or forms broad laminz covered with 
stars on one side, it becomes an Expianartra(6). 
The Porires are a sort of ramous Astrez(7). 
When this surface is marked with elongated lines, like little valleys 
separated by transversely furrowed hills, we have the Meanprina, 
Lam. 
In each valley, and from space to space, we find mouths, and the 
1;—WM. ramea, Sol. and Ell., XXXVIN;—M. fastigiata, 1d., XXXIN;—M. angu- 
losa, Id., XXXIV ;—WM. carduus, Id., xxxv, &e. 
(1) Mad. virginea, L.; Sol. and Ell., XXXVI;—M. hirtella, Id., XXXVII;—M. 
axillaris, 1d., XW, 5;—M. prolifera, 1d., XXXII, 2, &e. 
(2) The species arranged by Lamarck in this subgenus are regarded by Gmelin, 
Esper, &c., as varieties of the Madrepora muricata, L.; Pol. and Ell., LVII, &c. 
(3) Mad. damicornis, Esper, XLV1;—Millepora cxrulea, Sol. and Ell., XII, 4 
(4) Mad. serjata, Pall.; Sol. and Ell., XX XI, 1, 2. 
(5) Mad. radiata, Sol. and Ell., XLVI, 8;—M. annularis, Sol. and Ell., LIU, 
1, 2;—M. rotulosa, Id., LV, 1, 3;—M. ananas, Id., XLVU, 6;—M. plezades, 1d., 
LUI, 7,8;—WM. stellulata, Id., LIN, 3, 4;—M. favosa, 1d., L, 1;—M. denticulata, 1d., 
XLIX, 1;—M. abdita, Id., L, 2;—M. siderea, 1d., XLIX, 2;—M. galaxea, Id., 
XLVII, 7. r 
(6) Mad. cinerascens, Sol. and Ell., XLIM;—M. aspera, 1d., XX XIX. 
(7) Mad. porites, Sol. and Ell, XLVII;—M. foliosa, 1d., LU, &c. 
