COCCOLEPIS. 23 



large scales bear numerous short and small elongated tubercles, which are very 

 irregularly arranged (fig. 1 a). On the middle of the flank of the caudal region 

 shorter and deeper scales are seen, Avith a somewhat coarser and sparser ornament 

 of slightly elongated tubercles (fig. 1 c). At the ventral border, below the remains 

 of the pelvic fins, the small and elongated scales are marked with closely arranged 

 and much elongated tubercles (fig. 1 h). 



The air-bladder is large, as usual, extending in the fossil from a point shortly 

 behind the clavicle to the extreme posterior end of the abdominal region. 



Affinitiei^. — Jlndina p}irheclcensis appears to be closely related to the type 

 species, ZJ. penicUlafa, from the Lithographic Stone of Bavaria, but differs in being 

 a stouter fish, with a finer tubercular ornament on the principal scales. 



Horizon and Locallf)/. — Middle Purbeck Beds: Swanage, Dorset. 



Order AGTINQPTEBYGII. 



Family Pal.eoxiscid.e. 



The latest known members of this family occur in the Purbeck and ^Yealden 

 formations, and are referable to the highly specialised genus Coccolepis. 



Genus COCCOLEPIS, Agassiz. 

 Coccolepis, L. Agassiz, Poiss. Foss., vol. ii, pt. i, 1844, p. 300. 



Generic Cluiracters. — Trunk elegantly fusiform. Mandibular suspensorium 

 oblique; dentition consisting of an inner series of large laniaries flanked externally 

 Avith minute teeth ; external bones tuberculated or rugose. Fins large or of 

 moderate size, the rays of all articulated and branching distally ; fulcra minute or 

 absent. Pelvic fins with extended base-line; dorsal and anal fins triangular, the 

 former opposed to the space between the latter and the pelvic fins ; upper caudal 

 lobe much elongated, the fin deeply cleft and somewhat unsymmetrical. Scales 

 thin and deeply imbricathig, ornamented with tuberculations«of ganoine. 



Ti/jje Species. — Coccolepis hiiclcJandi (L. Agassiz, Poiss. Foss., vol. ii, pt. i, 1844, 

 p. 303, pi. xxxvi, figs 6, 7), from the Lithographic Stone (LoAver Kimraeridgian) of 

 Bavaria. 



Remarks. — This genus ranges upAvards from the Lower Lias of Lyme Regis 

 {Coccolepis liassica, A. S. Woodward, Ann. Mag. Nat. Hist. [6], vol. v, 1890, p. 435, 

 pi. xvi, figs. 2 — 4) to the "Wealden of Bernissart, Belgium {Coccolepis macropterus, 

 R. H. Traquair, Mem. Mus. Roy. Hist. Nat. Belg., vol. vi, 1911, p. 11, pi. i, 

 text-figs. 1 — 3). It also has a Avide geographical distribution, one species being 



