464 On new Species o/Madrepora in the British Museum. 



Great Barrier Keef {Saville-Kent) ; Samoa and " South 

 Seas" {Strasshurg Micseunif Ortmann). 



Madrepora tenella. 



Corallum much flattened, flabellate ; allied to M. elegans, 

 Ed. & H., but more delicate, and the marginal branchlets are 

 not flattened. Main branches 7 millim. broad, rarely over 3 

 millira. thick, somewhat sinuous, the subdivisions and coral- 

 lites almost all lateral. Simple lateral corallites give rise by 

 increase in size and the development of buds to twigs ranging 

 from 5 millim. to 4 centim. in length, the larger ones again 

 divaricately divided. Apical corallites 1 to 1*5 millim. 

 diameter, a little compressed, usually 3 millim. exsert. 

 Lateral corallites distant, compressed ; nariform at first, but 

 soon becoming tubular and very spreading, diameter 1 millim., 

 length 1 to 5 millim., those which are longer bear buds. 

 There are no immersed corallites, and in this species the upper 

 as well as the lower surface of the main divisions is usually 

 void of corallites of any kind. Star moderate. 



Macclesfield Bank, 31 and 37 fathoms {KM. 8. 'Penguin'). 



Madrepora tizardi. 



Madrepora nasuta, B.-Suiith (non Daua), Aun. Mag.N. H. vol. vi. 1890, 



p. 453. 

 Madrepora effusa, B.-Smitli (nou Daua), he. cit. p. 454. 

 ? Madrejwra plantaginea, B.-Smitli (non Lamarck), loc. cit. 

 ? Madrepora valida, B.-Smith (non Dana), loe. cit. 



Corallum corymbose, a little convex above ; under surface 

 oblique, reticulate or almost solid, with short stunted twigs in 

 the general plane, provided with a few scattered verruciform 

 and immersed corallites in reticulate specimens. Branchlets 

 erect and relatively slender and elongate in some specimens, 

 but shorter and stouter in others ; apices about 1*2 centim. 

 apart; length 4 millim , diameter 6 to 8 millim., or 1 centim. 

 in stunted forms. Apical corallites 2 millim. diameter, 

 cylindrical. Lateral corallites ascending and distant, dimi- 

 diate, gutter-shaped and hooked nariform, with the outer 

 margin curved ; those below are dilated, verruciform, with 

 the aperture opening inwards ; all are immersed at tlie base 

 of the branchlets ; length very variable, usually 2*7 to 4 

 millim., diameter about 1*6 millim., but all the more promi- 

 nent ones are distinctly compressed. At intervals elongate, 

 compressed, tubular corallites, with oblique apex, occur, which 

 indicate new outgrowths. Walls a little thickened and very 

 dense. Star moderately developed. 



