54 PERCY SLADEN TRUST EXPEDITION 



region. Algae not abundant in the mesenteries. Below the stomodseum the entocoelic 

 pleats extend over the greater part of the width of the mesenteries, broadening out in 

 the median regions, some of them secondarily cleft ; the mesoglsea is not thickened behind 

 the filaments. 



Polyps examined, eight, 4 from two typical specimens, 2 from specimen of tertia 

 facies, 2 from specimen whose corallum has varied towards E. lamellosa, all from Hulule, 

 Maldives. 



B. Corallum. Milne Edwards and Haime's type of E. hirsutissima (PL 15, fig- 4) 

 from the Indian Ocean, which is very likely Lamarck's original of Explanaria gemmacea, 

 var. stellis eomosis, is a large incrusting example measuring 30 x 20 cm. with a hillock 

 14 cm. high, and has more or less the tertia facies, but its costse and costal spines are 

 well developed. Resembling this is a specimen (14x11 cm.) in the Paris Museum 

 named E. 7'ingens, Dana, but without locality. Louis Rousseau's type of E. helli from 

 Seychelles — later re-described by Milne Edwards and Haime — is also a large specimen 

 (25 X 19 X 11 cm.) somewhat flat and raised into short hillocks, on the whole resembling 

 specimen no. 9 on p. 57, but in places the perithecal spines are strongly developed as in 

 no. 8. One of the specimens from Bourbon, measuring 13'5 x 6-5 cm., referred by Milne 

 Edwards and Haime to E. rosularia, really belongs to the present species, its corallites 

 projecting obliquely up to 3 "5 mm. with about forty septa in each, of which about twenty 

 meet the columella ; it has more or less the tertia facies. 



Localities. Maldives, Hulule (3). Chagos : Salomon (4); Coin, Peros (l). Also 

 from Seychelles (Rousseau), Bourbon Island (Milne Edwards and Haime). 



3. EcHiNOPORA GEMMACEA (Lamarck). (PL 14, fig. 9; 15, figs. 5 and 6; 16, figs. 

 5, 7, and 8; 17, figs. 2 and 3; 37, fig. 5.) 



1816. Explanaria gemmacea, Lamarck, Hist. Anim. sans vert., ii, p. 256; 2" edit., p. 399. 



1830. Echinastrea gemmacea, Blainville, Diet. Sci. Nat., Ix, p. 388 ; Manuel d'Actinol., p. 378. 



1834. Stephanocora hemprichi, iovraa. fruticulosa and forma explanata, Ehrenberg, Coral), roth. Meer., p. 76. 



1834. Explanaria hemprichii, Ehrenberg, Corall. roth. Meer., p. 82. 



1850. Astrea forskaliana, Milne-Edwards and Haime, Ann. Sci. Nat., Zool., 3'^ ser., xii, p. 100. 



1850. Echinopora gemmacea, Milne-Edwards and Haime, Ann. Sci. Nat., Zool., 'i" ser., xii, p. 186. 



1850. Echinojjora ehrenbergi, Milne-Edwards and Haime, Ann. Sci. Nat., Zool, 3"= ser., xii, p. 187. 



1850. Echinopora rousseaui, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3'' ser., xii, p. 188. 



1850. Echinopora solidior, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3'= ser., xii, p. 189 (non Echinopora 



solidior, Gardiner). 



1857. Heliastrma forskcelana, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 457, pi. D5, fig. 3. 



1857. Echinopora gemmacea, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 622, pi. D 9, fig. 2. 



1857. Echinopora liemprichi, Milne Edwards and Haine, Hist. Nat. Corall, ii, p. 623. 



1857. Echinopora ehrenbergi, Milne Edwards and Haime, Hist. Nat. Corall, ii, p. 625. 



1857. Echinopora solidior, Milne Edwards and Haime, Hist. Nat. Corall, ii, p. 626. 



1879. Orbicella forsMlaaa, Klunzinger, Korall. Roth. Meer., iii, p. 48. 



1879. Orbicella mammillosa, Klunzinger, Korall Roth. Meer., iii, p. 49, pi. 5, fig. 5, pi. 10,. fig. 10 a — c. 



1879. Echinopora fruticculom, Klunzinger, Korall Roth. Meer., iii, p. 55, pi. 6, tig. 4. 



1879. Echinopora ehrenbergi, Klunzinger, Korall Roth. Meer., iii, p. 56, pi 6, figs. 7 and 9, pi 10, fig. 15. 



1879. Echinopora concamerata, Klunzinger, Korall. Roth. Meer., iii, p. 57, pi. 6, fig. 6. 



1879. Echinopora carduus, Klunzinger, Korall. Roth. Meer., iii, p. 57, pi 6, tig. 5, pi 10, tigs. 14 a and b. 



1906. Orbicella forskalaaa, Marenzeller, Exp. "Pola," Roth. Meer., Riif korall, Zool Ergeb. Wien, xxvi, 



p. 61. 



