123 



in specimens of different rates of growth. Measurements are 

 unreliable, as would also be any dealing with the distances 

 between accretion- lines, unless several hundred specimens of 

 each species had been examined. 



The consideration of the specific variability of the polyps 

 must be deferred to the last section of this report, when tfiQ 

 anatomy of our species will have been dealt with. 



4. FLABELLUM PAVONINUM. (Plate IV., figs. 18—21). 



Flabclliun pavoiiinum Lesson, Illustr. de Zoologie, pi. 14 

 (183 1), Ed. et H., Ann. des Sc, nat., 36 sen, t. IX., p. 260 

 (1848), and Cor., t. 11. , p. 80 (1857). 



Eiiphyllia pavonhia Dana, Zoophytes, p. 159, pi 6, fig. 6 

 (1846). 



Flahelliim distinduiu Ed. et H., Ann. des Sc. nat., 3e ser., 

 t. IX., p. 262 (1848) and Cor, t. II., p. 80 (1857); Duncan, 

 'J rans. Zoo. Soc, Lond., qto., p. 2i'2-2., pi. XXXIX., figs. 1-13 

 (1871). 



I'labelluvi patins et auslrale, jNIoseley, Challenger Report, 

 pp. 172-3, pi. YL, figs. 4, 4a, 5, 5a and pi. VII., figs. 4, 4a, 5, 

 5a, 5b (1881). 



Flahelliim paripavoninum Alcock, Madreporaria, Calcutta 

 Museum, qto., p. 21, pi. II., figs. 3, 3a, 3b (1898). 



The collection obtained nine specimens of this species made 

 up of (1) five from 65 miles E. b. S. of Cape Natal, 54 fathoms^ 

 bottom "fine sand and algae"; (2) one 5^ miles S.E. |- E. from 

 the same, 62 fathoms, "sand, gravel and rock"; '3) one 9^- 

 miles S.S.W. \ S. from Cape Vidal, 80-100 fathoms, "rocky"^ 

 bottom; (4) one 9^ miles S.E. \ E. of O'Niel Peak, 90 fathoms, 

 "broken shells";" and (5) Umhloti R. Mouth N.W. \ W. 15^ 

 miles, 100 fathoms, "sand, shell, hard ground." 



The corallum of this species is characterised by its much 

 compressf'd calicle with flattened, pointed ends. The mouth 

 of the calicle in longitudi.ial section of its longer axis or as 

 seen in side view varies from two-thirds to a full semi-circle,, 

 so that the two end wings make an angle of from 120''^ to 180'' 

 with one another. In the centre there is a short cylindrical 

 pedicle, which only in the smallest specimen (long axis of 

 calicle i3'5 mm.) still remains attached. 



