2 G. HERBERT FOWLER. 



the calyces of the polyps being placed on the inner face and 

 on the brim of the goblet. The coeneuchyme is porous, in the 

 manner characteristic of the Perforata, but the echinulations 

 are not arranged in costse with the regularity observable in 

 some genera, except on the actual thecse of the polyps. The 

 latter project outwards from the ccenenchyme only abaxially, 

 i. e. inwards towards the centre of the goblet, the axial half being 

 almost level with the general surface. Specimens of the coralla 

 of this genus are not uncommon in museums ; a detailed des- 

 cription and figures are therefore unnecessary, and may be found 

 in the works of the authors appended below (p. 6). 



Owing to the small amount of the material at command, 

 none could be spared for the determination of the species. It 

 appeared, however, to beloDg to the type ofT. mesenterina. 



The septa, in fully-grown polyps of this particular species, 

 vary much in number, but are generally from seventeen to 

 twenty-two ; they are entoccelic only. It is worthy of re- 

 mark that the number of septa appears to bear no relation to 

 any multiple of six, nor can any division into orders be 

 effected, since all are approximately of the same length. A 

 loose and incomplete columella, occurring deep down in the 

 calices, appears to be referable to fusion of the septa. 



Part of a transverse section through the corallum (made 

 according to the balsam and ether method introduced by von 

 Koch) is represented in fig. 1, showing sections through at 

 least five polyp cavities. Of these one, a, is cut obliquely, 

 owing to the sharp angle at which the polyp cavities are in- 

 clined to the general axis of the colony ; of the others, which 

 are cut through at varying distances from their orifices, that 

 lettered b is a nearly transverse section, of a typical character, 

 exhibiting eighteen septa; while the three others, c, show the 

 reduction of the septa in the deeper parts of the cavities. The 

 upper part of the figure represents the abaxial, the lower the 

 axial, surface of the crateriform colony. The echinulations and 

 canal system are also well shown in this section. 



ii. Anatomy. — The whole colony, both inside and outside of 

 the goblet, is clothed with an external body wall of ectoderm, 



