123 



in specimens of diiferent 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 the 

 anatomy of our species will have been dealt with. 



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



Flabellum paiw7iimiiii Lesson, Illustr. de Zoologie, pi. 14 

 (183 1), Ed. et H., Ann. des Sc, nat., 3e ser., t. IX., p. 260 

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



Euphyllia pavo?una Dana, Zoophytes, p. 159, pi 6, fig. 6 

 (1846). 



Flabellum distinduiti Ed. et H., Ann. des Sc. nat., 36 sen, 

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

 'J rans. Zoo. Soc, Lond., qto., p. 322, pi. XXXIX., figs. 1-13 

 (1871). 



I'labeUuin patens et aiistrale, Moseley, Challenger Report, 

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

 5a, 5b(i88i). 



Flabelhuii parifavoninum Alcock, Madreporaria, Calcutta 

 Museum, qto., p. 21, pi. II., figs. 3, 3a, 3b (i8g8). 



The collection obtained nine specimens of this species made 

 up of (i) five from 6| miles E. b. S. of Cape Natal, 54 fathoms^ 

 bottom "fine sand and algae"; (2) one 5 J 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 

 compressed calicle with flattened, pointed ends. The mouth 

 of the calicle in longitudi.aal 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 13*5 mm.) still remains attached. 



