160 



at their sides (pi. vi., fig. 2c). It must be especially noted 

 that there has been no external budding, since in every case 

 the new coralla are attached to the internal surfaces of M^all 

 fragments. The mode of growth in this species is, therefore, 

 quite distinct from that observed in Paiasrnilia fecunda^ 

 Pourtales,* or in Balanophyllia rediviva, Moseley.f 



The coralla vary greatly in size, some being quite minute ; 

 still these are attached to wall fragments just as in the case 

 of the larger individuals. It should be noted also that, 

 thouo-h there are several highly elliptical calices amongst the 

 material, the majority are circular or nearly so. 



The following description of the corallum and calice in 

 this species applies to two of the largest examples in the col- 

 lection, the corallum of one and the calice of the other being 

 referred to (pi. vi., figs, la, h). 



Corallum long, tapering, slightly curved, and adherent 

 at its base to the internal surface of a small fragment of the 

 wall of the parent corallite. This fragment still bears indis- 

 tinct remains of the old septa. 



The calice is almost circular and deep. There are 36 

 septa, which are apparently arranged in seven systems, most 

 of which are defective. The number of cycles is four; the 

 first and second orders are approximately equal, the third 

 smaller, and the fourth very short. The calice of the corallum 

 figured contains 42 septa, but in it the same arrangement into 

 seven unequal systems holds. An irregular septal develop- 

 ment is, in fact, observed in all the examples, even the young- 

 est. The septa are arched, slightly exsert, and minutely 

 granular on their sides. 



Deep down in the central fossa the columella consists of 

 a few, usually five or six, pointed projections. There are 

 faint indications of costae, corresponding with the septa, on 

 the wall, which is thin, covered with a glistening, brownish 

 epitheca, and rises just above the calicular margin. 



The species is a Ceratotrochiis, of the same type as C 

 typ'ii^, var. Anstraliensis, which Duncan described from the 

 tertiary beds of Victoria. 



Height from margin of wall to attached base. 17 mm.; 

 diameter of calice, 7 mm. There are only three specimens 

 of this size, the remainder being much smaller. 



All were dredged by Dr. Verco at 90 fathoms off C. Jaffa, 

 and at 104 fathoms, 35 miles S.W. of Neptune Island, South 

 Australia. 



* Deep-sea Corals, p. 21, pis. i., iii., vi. 



t Eeporton Corals, pp. 193,4, pi. ^x., figs. 10-12. 



