es 
ig 
Notes on Cambrian. Faunas. 253 
and one or two complete examples.’ To the writer it appears 
that the latter species, if not both, belongs to Protolenus. 
The eyelobes in the Sardinian species are not so continuous 
as in the Acadian, but this may indicate merely a later de- 
velopment of the type, similar to that which occurred in 
Paradoxides, whose earlier species, and also whose embryo- 
nic forms show more continous eyelobes than the later 
species and the adult forms. 
Under the names of Solenopleura (?) Harveyi and S. (?) 
Howleyi*, Mr. C. D. Walcott has described two species of 
trilobites from Newfoundland, which are evidently closely 
allied to Protolenus elegans. In fact S. (?) Howleyi appears to 
differ only in the more advanced position of the eyes, the 
peculiar occipital furrow, and the absence of spines at the 
ends of the pleure. The spines of the pleure in this species 
may have been overlooked, for in the Acadian species, P. 
elegans, they are quite slender. There can be no doubt but 
that S. (?) Howleyi is a Protolenus. 
Under the name of Olenellus (?) Forresti, Etheridge, Jr.,° 
Mr. A. H. Foord has described a Cambrian trilobite from 
Western Australia, which also apparently may be included 
in the genus Protolenus. This, like the Acadian species, 
has a conical glabella and continuous eyelobes, but the eye- 
lobes are close to the glabella, leaving a very narrow fixed 
cheek. 'The eyelobes and margin of the middle piece of the 
head-shield are well defined, and give no reason for suppos- 
ing that the outer cheek was fixed, without which the 
reference to Olenellus is inadmissable. In fact the author 
who described the species implies that the outer cheeks were 
free. The pleure figured by Mr. Foord is evidently one 
belonging to an olenoid trilobite. 
1“ Fauna Cambriana—Trilobiti,”? In memoirs of Geological Commission of 
Italy, vol. iii. pt. 2nd. 
2 Fauna of the Lower Cambrian or Olenellus Zone, p. 657. N.B.—There is an 
error in indexing the Plate xcvii, in which this species is figured; the description 
in the text shows that Fig. 7represents S. Howleyi and Fig. 8 S. Harveyi. Re- 
verse also the page references. 
3 There is an obvious error in the description of this species, where at the sixth 
line ‘‘ widening ”’ should be narrowing. 
20 
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