22 Dr. H A. Nicholson on some new or 



Forbesi^ E. & H., from which it differs in the comparatively 

 large number and small size of the smaller corallites. It is 

 most like F. Forhesi, var. tuherosa^ Rom. ; but the corallum 

 never attains any great dimensions, and there are no traces of 

 the characteristic epithecal or opercular investment of the latter. 

 From F. Forhesi^ var. eifelensts, Nich., it differs in the great 

 number of the small tubes and the apparent absence of septal 

 spines ; and from F. Forbesi, var. waldronensis, Nich., it is 

 separated by the smaller size of the large corallites as well as 

 by their proportionately smaller number. — Horizon and 

 Locality. Inferior Devonian, Saint Jean sur Mayenne and La 

 Baconni^re. 



4. Pachypora cervicornis^ De Blainv. Numerous speci- 

 mens of this form, the branches varying in diameter from 5 

 millims. to over 2 centims., are represented in M. OEhlert's 

 collection. Their internal and external characters are pre- 

 cisely similar to those of specimens from the Eifel. — Horizon 

 and Locality. Inferior Devonian, Saint Jean sur Mayenne j 

 Mont Jean, Gallois. 



5. Pachypora^ ^i. A single fragment of limestone contain- 

 ing numerous stems of a small Pachypora imbedded in it. In 

 structure and general character this form is like P. cervicornis^ 

 Blainv. ; but the stems are all small (5 millims. or less in 

 diameter), and the tubes are more minute and more delicate 

 than in the latter. It is more nearly related to P. meridio- 

 nalis, Nich. & Eth. jun., from the Devonian rocks of Queens- 

 land ; but more extended material would very probably show 

 it to be a distinct species. — Horizon and Locality. Inferior 

 Devonian, La Baconni^re. 



6. Heliolites 2yorosus, Go\df. — Horizon and Locality. Inferior 

 Devonian, Chalonnes, La Baconni^re, and Gallois. 



7. Heliolites, sp. A form resembling H.inte7-stinctus,yVah\.f 

 but with larger tubes and with some less conspicuous peculi- 

 arities. — Horizon and Locality. Inferior Devonian, Mont Jean, 

 Gallois. 



8. Monticidipora Winteri, Nich. Several specimens (from 

 the Inferior Devonian of La Baconni^re), which, both in ex- 

 ternal characters and in microscopic structure, precisely agree 

 with the examples of the Eifel. Dr. Steinmann, for whose 

 opinion I entertain the highest respect, has suggested recently 

 (N. Jahrb. fiir Min. Geol. und Pal. 1880, p. 438) that this 

 species is really the Favosites Jihroglohosus of Quenstedt, de- 

 scribed from the same locality (Gees, near Gerolstein). I do 

 not feel at present able to accept this conclusion, for two reasons. 

 In the first place, I have made a careful examination of nume- 

 rous specimens, both German and French, of the form which 



