MADREPORARIA OF THE BOULONNAIS. TA 
agree closely with the figure of Lxthodendron pseudostylina of 
Michelin. The largest specimen consists of the terminal portion of 
a corallum: that is to say, of a good many corallites of small size 
placed rather closely side by side. In these, as well as in fragments 
haying a greater diameter, a rather large and highly porous colu- 
mella is observable. This I do not find mentioned by Michelin or 
by MM. Milne-Edwards and Haime. The species occurs at Hourecq 
or Hesdin lAbbé. 
Genus RuappopHyLuiA, M.-Edw. & Haime. 
RwsaBDoPHYLLIA Puitzties1, M.-Edw. & Haime, Polyp. Foss. Terr. 
Paléoz. p. 83 (1851); Brit. Foss. Cor. p. 87, pl. xv. fig. 3 
(1851). 
Only one specimen, which agrees very closely with Steeple 
Ashton specimens, has reached me. ‘The species has been obtained 
from Hourecq and the Mont des Boucards. 
Genus Tuecosmitia, M.-Edw. & Haime. 
‘ THECOSMILIA ANNULARIS, M.-Edw. & Haime, Pol. Foss. Terr. Paléoz. 
p. 77 (1851) ; Brit. Foss. Cor. p. 84, pl. xiii. fig. 1, and pl. xiv. 
fig. 1 (1851). 
A considerable number of specimens, chiefly in fragments, are in 
the collection of M. Rigaux, which, labelled with the names of 
Hourecq, Boucard, and Houllefort, determine the range in time of 
the species in the Corallian of the Boulonnais. 
Genus ConFusAstRmA, d’Orb. 
CoNFUSASTRHA, Sp. 
The collection contains a portion of a large specimen which, 
when entire, must have had a diameter of at least 8 or 9 inches. 
I am unable, from its present condition, to determine the species, 
but may state that the calices are larger and the septa stouter than 
in Confusastrea magnifica. 
Genus DimorpHoPHyr.iA, Reuss. 
DImMoRPHOPHYLLIA JURENSIS, Becker, Paleontographica, vol. xxi. 
p. 155, pl. xxxvii. fig. 8. 
The only evidence of the presence of this well-marked species 
in the Coral Rag of the Boulonnais rests on a somewhat frag- 
mentary but well-preserved and characteristic specimen sent to me 
by M. Rigaux several years since. It was obtained from Hourecgq, 
and, until relieved of its enclosing matrix, was supposed to be a 
Thamnastrea with widely separated calices. Compared with speci- 
mens of Dimorphophyllia owylopha, Reuss, in my collection, from 
the Upper Oligocene beds of Monte Grumi, the generic identity of 
the Jurassic and Tertiary species becomes evident. With the 
