52 On Pentacrini zr Great Oolite near Basle. 
Those who think such name-giving unsafe and worse than need- 
less will perhaps excuse me when they learn that in the general 
collection of the Basle Museum there are similar fragments 
labelled ‘‘Pentacr. tuberculatus, Desor, Terrain & chailles, K1. 
Basel,” and that to this M. de Loriol has added in MS.: “Ce 
Pentacrinus me parait app. & une espéce nouvelle trés-voisine 
du P. subsulcatus, Miinster, du Lias: ce dernier n’a pas de creux 
sur les sutures. Commeil n’y a ni localité ni niveau indiqué, 
je m’abstiens de la décrire.” The stems are pentagonal and 
basaltiform ; the stem-joints equal one another in height and 
diameter. The angles are well marked, but there is no re- 
entrant angle. The sutures are depressed on the lateral faces, 
but not on the angles; thus there is a ridge on each face of 
the joint between the angles. ‘This gives the stem its charac- 
teristic scalariform appearance. ‘The surface is otherwise 
smooth. The crenulations, which form a rosette on the arti- 
cular surface, are only visible on the exterior at the angles; 
this is owing to the depression of the suture on the intervening 
face. The diameter is slight, varying from *9 to 2°5 milli- 
metres in different specimens. 
It should perhaps be noted that M. de Loriol has figured 
as Pentacr. crista-galli, QQuenst., some small stem-fragments 
from the lower beds (Bajocien) of Muttenz, in the collection 
of M. E. Greppin*. These figures bear some resemblance to 
the present species. P. Basilee may be descended from P. 
crista-galli, but it is certainly not identical. 
Fig. 1. Fig. 2. 
Fig. 1.—Pentacrinus Nicoleti, var. minimus, from Great Oolite of Mut- 
tenz, near Basle; in British Museum [E, 5505]; x 4 diam. a, 
side view ; 6, articular surface. 
Fig. 2.—Pentacrinus Basilee, GreatOolite, Muttenz; Brit. Mus. [E. 5506]; 
x 6diam. 4, articular surface, rather worn; 6, side view, the 
crenulation of the suture at the angle has not been copied well 
by the engraving process, 
* Monogr. des Crinoides fossiles de la Suisse, pl. xv. figs. 29 and 30, 
vide p. 136; in Mém. Soe. pal. Suisse, vol. vi. (Basle and Geneva, 1879). 
