122 TABULATE CORALS. 



tologists, and which externally resemble this genus more or less 

 closely. In most of the views therein expressed, I am still quite 

 willing to concur, but the further observations which I have 

 made enable me to state these views in a more definite form 

 than was at that time possible, and also to make some modifi- 

 cations in them. The results, then, of my inquiries, combined 

 with those formerly arrived at by my colleague and myself, 

 are briefly as follows : 



1. Taking Alveolites sub orbicular is, Lam., as the type of 

 Alveolites, the genus may be usefully retained, but the pres- 

 ence of septal teeth must be abandoned altogether as a generic 

 distinction, and we must include under the same head forms 

 such as A. Labechei, E. and H., and A. Goldfussi, Bill., which 

 have numerous septa, or in which the septa are obsolete. On 

 this view, Alveolites will include forms which agree with Favo- 

 sites in all essential characters, save only the possession of 

 oblique calices and narrow compressed or triangular coral- 

 lites. I fully admit that the characters just mentioned, when 

 standing alone, cannot be strictly regarded as of generic value, 

 and that the most rigidly scientific course would be to merge 

 Alveolites in Favosites. This course, however, would render 

 the genus Favosites an extremely unmanageable one, and upon 

 the ground of practical convenience I prefer separating Alveo- 

 lites by means of the readily recognisable character of the reclined 

 corallites and oblique calices. All the species thus placed in 

 Alveolites agree with one another and with Favosites proper in 

 having thin-walled corallites, without any excessive thickening 

 of the terminations of the tubes, and they are thus distin- 

 guished both from Pachypora and from Coenites, with which 

 they are otherwise closely allied. I include in this group 

 Alveolites sub orbicular is, Lam., A. Labechei, E. and H., A. 

 Goldfussi, Bill., A. Indianensis, Rom., and all forms related 

 to these. 



2. Some of the forms which have been referred to Alveolites 

 are properly placed under the genus Pachypora, Lindst., as 

 shown by the thickening of the interior of the tubes by a dense 



