246 
BULLETIN OP THE NATURAL HISTORY SOCIETY. 
NOTES ON CAMBRIAN FAUNAS, NO. 9. 
In the Transactions of the Royal Society of Canada, the writer 
has from time to time offered additions to the Cambrian faunas 
under the title of “Studies, or Notes on Cambrian Faunas.’' The 
following may be considered a continuation of those notes : 
Protolenus. 
This genus is represented at a later time in Europe in Anomo- 
care of Angelin, found in the Upper Paradoxides beds of Sweden. 
This genus like Protolenus was characterized by an elongated eye- 
lobe, and usually by a cylinderical glabella ; the species also in 
most cases had a broad anterior limb to the moveable cheek. 
This latter feature is not clear for A, loeve from Angelin’s 
figure,* but it is more evident from Gronwall’s represtation.** 
This character seems to have been overlooked by authors who 
haye referred to Anomoacre species with shorteyelobes, perhaps 
depending on Angelin’s figure of the type species. 
But while Protolenus has a rather broad anterior limb to the 
fixed cheek, it has not the exaggerated expansion found in most of 
the Swedish species of Anomocare ; neither has it the small lobes 
found on the fixed cheeks near the glabella in most spiecies of this 
genus ; the variety bituberculatus of P. paradoxoides, however, has 
a small swelling near the base of the glabella, corresponding nearly 
to that seen in A. aadeatiim ( = difformc). It is probable that the 
])ygidium was more feebly developed in Protolenus than in Ano- 
mocare, and at least one species of the former (P. (P.) articepha- 
liis) had one more joint in the thorax than Angelin represents for 
any species of Anomocare. Nevertheless there may have been a 
relationship of descent between the two genera, Angelin’s being 
the later. 
* Pal Scandinav; 'I'ab. xviii, i. 
**Bornholms Fanidoxldeslai'.Tab. 4 li^r. 
