Oil Two Neiv Tertlari/ Sfijlasterids, 111) 



branch, in reference to a cyclosystem, is not quite constant. 

 In the latter case, six dactylopores are present. In botli 

 tliese cases the dactylopores are rather indistuict, and the 

 systems are possibly in process of obliteration, such oblitera- 

 tion being recorded by Moseley, as occurring in oldei" portions 

 of colonies oi' £!rrina* 



The gastropore is approximately circular in outline, slightly 

 funnel-shaped above, and cylindrical below. The presence 

 of the matrix prevented a closer examination of its deeper 

 parts. 



The ampulla; form comparatively large hemispherical pro- 

 jections above the surface of the coenosteum. Their position 

 is not constant, though they lie near the base of a cyclo- 

 system. Some systems have no ampulla near them, while 

 one has two, placed one on each side of the base, tho\igh one 

 seems the usual number. In some cases, a small aperture 

 at the base leads through the outer wall of the ampulla, 

 which, as a fractured portion shows, is thin. In one instance, 

 this aperture is surrounded by a slightly projecting neck, 

 with a thick, definite wall. The only external openings 

 leading into ami)ulliTe mentioned by Moseley, -f* occur in male 

 colonies of Sporadopora, where the}^ are small and olit-like, 

 and are placed at the bottom of irregular depressions, which 

 are seen with difficulty. 



In Cryptokella the female colony has but one ampulla 

 associated with each cyclosystem, but in what are, perhaps, 

 male colonies, several ampullre occur with each.^ In the 

 female colonies of most of the stylasteridtie desctibed by 

 Moseley, there is only one planula developed in each ampulla, 

 and tiie only means of escape seems to be by absorption and 

 breaking down of the outer wall of the ampulla.§ 



In Cryptokella, however, there are several gonophores 

 present in each gonangium in all stages of deve]opment.|| 

 In the latter case, a definite constant means of escape for the 

 planulse would seem to be necessary, though I can find no 

 mention of this. The large size of the ampullfe in the 

 present example <d1 Deontopora, would be a strong argument 

 in favour of the colony being a female one, and the ])resence 

 of such a definite opening into the ampullae would, I think, 



* Op. cit., p. 444. t Op. cit., p. 431. 



: Op. cil., p. 46H. . § Id., p. 441. 



il Op. cil., p. 477. 



