118 Proceedings of the Royal Society of Victoria. 



sepaj'sited by grooves. The ridges are pai-allel and can be 

 traced separately for some distance. In sonje places, brandl- 

 ing and anastonu/sing of the ridges takes place. Over the 

 .surfaces of the ampulla^ the ridges are contorted very much, 

 and tlieir individuality is preserved for a very shoit distance. 

 In the groo\es between the ridges, under a strong light, 

 narrow slit-like pits can be seen with a hand lens. Pourtales, 

 as quoted by Moseley,* mentions small linear pores arranged 

 in rows and scattered over the whole coenenchyma in 

 Pliobothrus symmetricus (Pourtales). These pores, Moselej' 

 states, are occupied by canals of the coenosarcal meshwork 

 in the recent condition. The pits in Deontopora are 

 probably the mouths of pores with the same function, as 

 the mici-oscope shows they have considerable depth. In 

 two places, where smaller branches had been broken off, the 

 ccenosteum had a cellular appearance, but this was not 

 visible on the ends of the specimen. 



The cyclosystems are arranged alternately on opposite 

 sides of the branch, and are a little over 1 nnn. in diameter. 

 The axis of the system and that of the bi'anch, form an angle 

 of about 45°. The inner wall of the gastropore is confluent 

 with the side of the branch, and the cord-like ridges 

 mentioned above, run right down into the mouth of the 

 pore. The dactylopores are placed on an elevated flattened, 

 horse-shoe-sha[)ed ridge overlooking the gastropore. Each 

 dactylopore is situated in a broad, deep gi-oove, at about 

 one-third of its length from the outer end of the groove. 

 This groove cuts the outer wa\\ of the cyclosystem, wliile 

 its inner end runs out on to the level floor pierced by the 

 gastropore. As in Astylus isiibvirldis,-\- the upper edge of 

 the system slightly overhangs the outer wall, and shows 

 marginal indentations corresponding with the centres of the 

 outer ends of the pseudosepta, or walls between neighVjouring 

 dactylopores. The broken edges of the pseudosepta are 

 cellular in appearance. The number of dactylopores in each 

 S3^stem is variable, twelve or thirteen usually occurring. 

 In one place, where a small branch is given off", a gastropore 

 is in the axil, and four dactylopores are placed on eacli of 

 the opposite sides, none being found on the sides of either 

 the main or the secondary branch. In another case, the 

 cyclos3^stem is at one side of the base of a small branch, 

 slightly below the level of the axil, so that the position of a 



III, p. 440. + Moseley, op. cit., p. 457. 



