﻿16 AC.VNTH0D11. 



P. 3264. Two imperfect mandibular rami with ceratohyals, a jaw- 

 fragment, and a detached ceratohyal ; Newsham. 



Enniskillen Coll. 



The following pectoral fiu-spines may pertain either to Acantlio- 

 dopsis or to a large form of Acanihodes : — 



P. 1328. Imperfect spine, slightly arched, with a single longitudinal 

 furrow near the anterior margin, preserved for a length 

 of 0-11 ; also two associated portions of similar spines ; 

 Coal-Measures, Lowmoor, Yorkshire. Egerton Coll. 



P. 3252. Two imperfect specimens, one larger, one smaller ; Low- 

 moor. Enniskillen Coll. 



P. 2285. Fragment of large spine ; Coal-Measures, Carluke, Lanark- 

 shire. Presented by George Griffiths, Esq., 1882. 



Genus CHEIRACANTHUS, Agassiz. 



[Poiss. Foss. vol. ii. pt. i. 1835, p. 125.] 



Body fusiform, laterally compressed. Teeth minute or absent ; 

 orbit with ring of four circumorbital dermal plates. Pectoral 

 fins large ; pelvic pair w^ell developed. A single dorsal fin, arising 

 opposite the space between the pelvic fins and the anal. 



Cheir acanthus murchisoni, Agassiz. 



1835. Cheiracanthus murchisoni, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 



p. 126, pi. i c. figs. 3, 4. 

 1835. Cheiracanthus minor, L. Agassiz, ibid. pt. i. p. 127, pi. i c. fig. 5. 

 1844. Cheiracanthus microlepidotus, L. Agassiz, Poiss. Foss. V. G. R. 



p. 38, pi. xv. figs. 1-3. [British Museum and Forres Museum.] 

 1848. Chiracanthus lateralis, F. M'Coy, Ann. Mag. Nat. Hist. [2] 



vol. ii. p. 300. [Woodwardian Museum, Cambridge.] 

 1848. Chiracanthus pulverulentus, F. M'Coy, ibid. p. 299. [Ibid.] 

 1855. Chiracanthus lateralis, F. M'Coy, Brit. Palseoz. Foss. p. 582. 

 1855. Chiracanthus microlepidotus, F. M'Coy, ibid. p. 583. 

 1855. Chiracanthus minor, F. M'Coy, ibid. p. 583. 

 1855. Chiracanthus murchisoni, F. M'Coy, ibid. p. 583. 

 1855. Chiracanthus pulverulentus, F. M'Coy, ibid. p. 583, pi. iiB. fig. 2. 

 1888. Cheiracanthus murchisoni, R. H. Traquair, Geol. Mag. [3] vol. v. 



p. 512. 



Type. Imperfect fish ; unknown (olim Murchison Collection). 



The type species, usually attaining a length of about 0'16-0'2, 

 but occasionally measuring as much as # 3. Body elongated and 

 slender, the greatest depth being nearly equal to the length of the 



