[MATTHEW] STUDIES ON CAMBRIAN FAUNAS 91 



middle 3 mm. The length and width of the glabella ai-e equal (10 mm.). 

 Length of the ten joints of the thorax 28 mm., width at the middle 30 mm. 

 Horizon and Locality. — Mr. Howley was unable to indicate the exact 

 horizon of this specimen. The matrix is a greenish gray fine shale, 

 similar to that which at that locality (Manuel's Brook) holds fossils of 

 the P. Davidis subzone of the Paradoxides Beds, where probably it 

 belongs. 



EEINNYS, Salter, 1872. 



Erinnys breviceps, Ang. (PI. lY., fig. 9.) 



Harpides breviceps, Ang., 1854, Palaeont. Scand., p. 87, pi. xli., fig. 8. 



Erinnys venulosa. Salt., Hicks., Quart. Jour. Geol. Soc, vol. 28, 1872, p. 178, pi. vi., 



figs. 1 to 6. 

 cf. Carausia menevcnsis, Hicks., Quart. Jour. Geol. Soc, vol. 28, 1872, p. 178, pi. vi., 



fig. 7. 

 Harpides breviceps, Aug., Linrs., Die Underparadoxoideslagren vid Andrarum, 



1883, p. 27, tab. iv., figs. 16 a, b. 



This notable species of Angelin shows its close relation to Cono- 

 coryphe in many ways, and from the observations which follow, it will be 

 seen that it is no more than a sub-genus of that genus. 



The other species referred to Harpides occur in the base of the 

 Ordovician, and are claimed to have eye-lobes or eyes, of which we can 

 find no trace in this species, nor are they shown either by Angelin or 

 Linnarsson for the examples found in Sweden ; this appears to be an 

 important distinction, and if eyes are actually found in the Ordovician 

 species, the generic distinction between Harpides and Erinnys must be 

 maintained. 



It is true that the supposed eyes of the Ordovician species are in an 

 anomalous position, being before in place of behind the ocular fillet ; 

 still such acute observers as Barrande and Beyrich have asserted that 

 these prominences have the office of visual organs. 



Angelin's description as usual, is exceedingly brief, viz., Harpides 

 capite hevi, canaliculo lato intramarginali. Of course the "Harpides" 

 refers us to the generic characters of Beyrich's genus, and we have 

 Angelin's figures to help to an understanding of the form, but without 

 Linnarsson's careful and extended diagnosis of the species, we would be 

 in doubt as to whether the Newfoundland fossil was of the same species, 

 or not. 



Linnarsson's observations and descriptions were based on the tvpical 

 material preserved in the Royal Museum at Stockholm, and his diagnosis 

 is as follows : — 



" Head-shield semicircular (without a margin ?) twice as wide as 

 long, having the exterior part bent back into angles scarcely at all ex- 

 tended. Glabella small, occupying less than half of the head [exclusive 



