4 DEVONIAN FAUNA. 



lays great stress on the granulations on the cheeks, which he describes as coarser 

 than those on the glabella, but which are altogether absent in our fossils. He 

 also mentions a deep groove running round within the border, whereas in our 

 form this groove is only slight. In the Woodwardian Museum are three German 

 specimens, believed to have been presented to it by Count Minister himself, and these 

 bear out these distinctions, and also show that the eye was situated much further 

 forward, so as to have a large portion of the cheek behind it. It may be observed 

 that one of these specimens, wanting the test, goes to prove that his Gah/mene 

 lgevis x belongs to the same species. 



In the same Museum are the four type-specimens from Petherwin, figured by 

 Sowerby 2 as two species of Calymene, and identified by M'Coy 3 as Portlockia 

 granulata (Mi'mst.). These agree in the position of the eye, in size, and other 

 respects with the German specimens, and evidently belong to that species. The 

 reason Sowerby regarded them as two species, is that one of them is smooth, but 

 this only arises from its being a cast ; the other is very coarsely granulated. It is 

 to be noted that these Woodwardian specimens (both German and English) agree 

 in having only about twelve longitudinal rows of facets in the eye, and in the 

 number of lenses themselves being very small. 



Turning now to Phillips's ' Palasozoic Fossils '* we find G. granulata described 

 both from Petherwin and Hope's Nose, though unfortunately the localities of the 

 figured specimens are not distinguished. It appears likely that more than one 

 species is included here ; the three tails (to, o,p) may belong to the genus Proetus ; 

 the heads (a, b, c, d, e) agree with Minister's species, showing the granulated cheeks 

 (which he notes) and the anterior position of the eye, and probably came from 

 Petherwin ; while the heads (g, h, i) look more like the Lmnmaton species, 

 but are too slightly drawn for certain identification. I have not myself observed 

 these fossils at Hope's Nose. 



Salter, in his ' British Trilobites,' 5 describes Ph. granulatus in terms which 

 agree with that species, and his figures of the Petherwin fossils clearly represent 

 it ; but his largest figure is from a specimen, in Mr. Pengelly's cabinet, from 

 Newton, and evidently belongs not to Ph. granulatus but to our Lummaton species. 



As occurring at Lummaton Phacops batracheus seems very definite and well 

 marked ; it is a Trilobite with a pentangular, pointed, and finely granulated 

 glabella overhanging the border, and with large low funnel-shaped eyes, almost 

 filling the cheeks, which were smooth and scarcely furrowed. 



From Calymene, latifrons, Bronn, as seen in German and English specimens, it is 



1 1840, Miinst., ' Beitr.,' pt. 3, p. 36, pi. v, fig. 4. 



2 1840, Sow., ' Geol. Trans.,' ser. 2, vol. v, pt. 3, pi. liv, figs. 23, 24. 

 8 1851, M'Coy, 'Synops. Pal. Foss. AVoodw.,' p. 177. 



« 1841, Phil., ' Pal. Foss.,' p. 128, pi. lvi, figs. 248 a— p. 

 5 1864, Salter, ' Brit. Trilob.,' p. 18, pi. i, figs. 1—4. 



