1 78 THE GEOLOGICAL AGE OF CENTRAL AND WEST CORNWALL. 



CRUSTACEA. 



1 . Phacops laciniatus — Padstow, Liskeard, St. Keyue, McCoy ; 



with Atrypa desquamata, a Mid. Dev. form, according to 

 Murcliison, see Sihtria 5tli. Ed. p 278 



2. PortJochia latifrons — (McCoy) Pridmouth. 



ii. Crustacea — Pose Yale Qiiai-ry, Liskeard. Peach, Trans. 

 E.G.S.C, ix. 52. 



PISCES. 



1. Ceplialaspis Lyellii — Polperro, Peach 1841, Couch 1850. A 



lower Old Eed Sandstone and '•' Tilestones " form. 



2. G. ornahis (probably Ctenacanthas ornatus) — Polperro, Peach 



1844. Perhaps Auchenaspis ornatus, a " Passage Beds" 

 species (Murchison). 



3. Asterole2}is sp. — Cross-sand Point, Looe, Polperro, Lantivet 



Bay, Peach 1848, Couch 1850. Hugh Miller thought 

 one of the fossils from Lantivet Eay resembled 

 Asterolepis. " This is the only sj)ecimen Mr. Miller 

 could identify as agreeing with any of the fishes of 

 the Old Ped Sandstone." Another Palaeontologist (no 

 doubt Sir P Egerton) " one of the most eminent" could 

 not identify one. Mr. Pengelh' lias a fossil resembling 

 an Asterolepis shoulder plate from Cross-Sand Point, 

 Looe, {Peavh, Trans. E.O.S.C , vii, 123, 3; 3). 



4. Ctenacanthus sp. — Polperro, &c.. Peach 1847. 



5. IIoloptt/cMus nohilissimus — Polperro, Peach 1844. According 



to Murchison, however, this is not H. nohil, which is 

 an undoubted Devonian species. Perhaps it may be the 

 Bothriolepis of Egerton. Mr. Eay-Lankester mentions 

 in a private communication with which he favoured me 

 in 1881, "a scale like Holoptychius " 



6. Onchus M'urchisonii — Polperro, Peach 1844. Murchison says 



this specimen is not 0. MurcJi, which is a Ludlow and 

 doubtful Passage Beds species. It m^j be, according to 

 Egerton [v. Trans. P.G.S.C, vi., 320), a Ctenaca)tt]ms or 

 perhaps 0. te7iuirostris (Eger.)=0. tenuiserratus (Agns.) 

 which is Ludloiv. Certainly manj' of the Lantivet Bay 

 fish-spines much resemble the figures of Onchus given 

 by Murchison in Siluria 5th. Ed. PI. xxxiv an xxsv. 



