28 DR. G. C. BOURNE Ol^f 



paratively deep-sea form of vi hich tlie allied species ai^e, with 

 two exceptions, found only in the fossil state. 



The larger of my specimens is attached to a dead and corroded 

 specimen of the same species, and looks at first sight as if it had 

 been budded off from it. But it is clear on close examination 

 that this is a case of simple attachment, and the coral is solitary 

 and not compound. This specimen measures 20 mm. in height ; 

 the greater diameter of the calyx is 12 mm. and the lesser 

 diameter 10 mm. 



The second specimen is smaller, the calyx measuring 7x6 mm., 

 and the fourth cycle of septa is incomplete, consisting of 

 18 septa only. This is clearly a young individual in which the 

 fourth cycle is not yet fully developed ; and it is worth noting 

 that the quaternary septa that are present are regularly 

 arranged in pairs, embracing the tertiary septa, and three such 

 pairs are missing, namely, one in the right sulcular and one 

 in each of the right and left sulcolateral systems. In other 

 words, the order of appearance of the septa of the fourth cycle 

 does not conform to Milne-Edwards and Haime's law, as is 

 so frequently the case in other corals. This specimen is attached 

 to a dead fragment of a Loplwhelia ; and a very small and young 

 TrocliocyatTius is growing on the same fragment, having six 

 larger primary septa, six smaller secondaries, and only an 

 indication of the tertiaries. 



The five free Turbinolids are characterized by the presence 

 of five (in one specimen six) long and slender spines projecting 

 outwards and downwards from the lower moiety of the calyx. 

 They show some resemblance to Deltocyathus italicus, var. calcar 

 of Pourtales, but differ from that species in not possessing the 

 characteristic deltoid pali. They are clearly very closely related 

 to Turhinolia MantelU, figured but not described by Gr. 

 A. Mantell, in a paper on the Geology of New Zealand, in the 

 Quarterly Journal of the G-eological Society of London, vol. vi. 

 1850, pi. 28. fig. 18. Milne-Edwards and Haime record this 

 species among the doubtful forms of Trochocyathtcs as Trocho- 

 cyathus (?) MantelU, and call attention to its close affinity to 

 Troclwcyatlius armatus, Michelotti, and T. jjerarmatus, 

 Tallavignes. I have not been able to refer to Michelotti's 

 figures of T. armatus, but it appears from the description to 

 difi'er from my specimens in the shape of the calyx and the 

 character of the pali ; while Kouault's figure of T. perarmatus, 



