64 MADREPORARIA. 



jagged at the edges. Between these plates, in the bases of the furrows, the open pores are 

 clearly visible. When the jagged points of the ridges all stand outwards as around the calicles, 

 they appear to be very markedly echinulate. 



The coral agrees, in the cliarader of the calicles, very closely with the figure given by 

 Milne-Edwards of Turhinaria mcsentcrina, but differs in the sizes of the calicles and in the 

 thickness of their margins. They may perhaps be specifically identical. 



Milne-Edwards' description of the corallum, " en g(5n(^ral foliace, contourn^, irri^guli^rement 

 bossue en dessus, quelquefois encroutant," might or might not apply to the tabulate method of 

 growth. 



Dr. Klunzinger suggested that Milne-Edwards' Turlinaria mesenterina was the same as 

 his T. conica (see above, p. 58). Both are from the Eed Sea. 



The type specimen, together with a younger, more conical growth, is from Tongatabu, and 

 agrees closely in general aspect with T. 2Mlchcrrima and T. vclida from the same locality. On 

 this striking resemblance of specimens from the same locality, see p. 18. 



There are, further, two other nodulated fragments from the Great Barrier Eeef, which, 

 from the characters of the calicles, appear to belong here. If so, they have lost the character 

 of the coenenchyma peculiar to Tonga Turbinarians, and the calicles are slightly smaller. 



a. Tongatabu. J. J. Lister, Esq. [91. 3. 6. 21.] (Type.) 



I. Tongatabu. J. J. Lister, Esq. 



c. Eocky Island, Great Barrier Eeef. Saville-Kent CoU. 



d. Great Barrier Eeef. Saville-Kent Coll. 



Species 47. Turbinaria veluta. (PI. XX. ; PI. XXXII. fig. 19.) 



Description. — Corallum a horizontal growth, somewhat bent, arching over former hori- 

 zontal growths, and attached to the upturned edges of the latter, leaving hoUow chambers 

 between. Margin and corallum not specially thickened. 



Calicles very protuberant (to 4 mm.), on thick blunt cones (almost cylinders), the tops 

 of wliich are filled by the round-oval apertures (2 • 5 to 2 mm. long diameter). Septa (about 

 twenty-four) very u-regidar, seen from above, project beyond half-radius circle ; in reality 

 they slope gradually down to the columella, then descend sharply all round it without 

 appearing in contact with it. The shallow fossa is thus funnel-shaped, and the columella, a 

 small sharply demarcated protuberant oval mass of loose spongy te.xture. The interseptal 

 loculi are not sharply marked off from the surrounding ccenenchyma. 



The ccenenchyma is quite smooth to the touch, and looks like a beautiful velvet ; under 

 the glass it is seen to consist of an exquisitely delicate arrangement of gyrating ridges and 

 furrows, the former being very finely echinulate. 



There is only one specimen from Tongatabu, showing the same general appearance as the 

 other specimens from the same locality, but differing too greatly in the characters of the 

 calicles to be classed witlr them. There is no other specimen in the Collection at all 

 resembling this. 



a. Tongatabu. J. J. Lister Esq. (Type.) 



