382 MEMOIRS OF THE CARNEGIE MUSEUM. 



ing a peg-and-socket articulation; dorsal and ventral scales few, relatively small 

 and rhomboidal. Lateral line deflected, passing down the second or third deepened 

 flank-scale and then traversing the uppermost series of small ventral scales." (A. 

 S. Woodward, I. c, Pt. Ill, p. 482-3). 



23. Pleuropholis thiollieri Sauvage. 

 1873. Pleurophoilis V. Thiolliere. 



Poiss. Foss. Bugey, Pt. II, pi. VI, fig. 6. 

 1883. Pleuropholis thiollieri H. E. Sauvage. 



Bull. Soc. Geol. France [3], Vol. XI, p. 499. 

 1895. Pleuropholis thiollieri A. S. Woodward. 



Cat. Foss. Fishes Brit. Mus., Pt. Ill, pp. 485-6. 



" Type. — Nearly complete fish; Lyons Museum. 



A species attaining a length of about 12 cm. Length of head with opercular 

 apparatus about equalling the maximum depth of the trunk and contained nearly 

 five-and-a-half times in the total length of the fish; caudal pedicle slender, its width 

 equalling two-thirds the depth of the fiank-scales in the middle of the abdominal 

 region. Pelvic fins arising midway between the pectorals and the anal; the latter 

 fin arising slightly behind the middle point between the pectorals and the caudal. 

 Scales smooth, not serrated." (A. S. Woodward, I. c, Pt. Ill, pp, 485-6). 



This species is represented in the collection by two individuals of average size, 

 cataloged as Nos. 4318 and 4322. A smaller example, cataloged as No. 4032, 

 is perhaps also referable to the same species. This latter is of about the same size 

 as the unnamed original of Thiolliere's Plate VI, fig. 5, a specimen which was sub- 

 sequently described by Sauvage (BuU. Soc. Geol. France [3] Vol. XI, 1883, p. 498; 

 pi. XIII, fig. 1) under the preoccupied title of P. egertoni. According to Dr. A. S. 

 Woodward, the original of Thiolliere's and Sauvage's illustrations is indistinguish- 

 able from P. serrata Egerton. In whatever way we may regard the identity of 

 Thiolliere's original (Poiss. Foss., Pt. II, 1873, pi. VI, fig. 5) the specimen bearing 

 the Carnegie Museum Catalog Number 4032 differs from it in the non-serrated 

 condition of the principal flank-scales. 



Family OLIGOPLEURID.E. 



" Trunk fusiform. Head with delicate membrane bones, scarcely, if at all, 

 enamelled; mandibular suspensorium nearly vertical or inclined forwards, and gape 

 of mouth wide; teeth small or of moderate size. Vertebral centra well-ossified, 

 with no distinct pleurocentra and hypocentra in any part of the column; large free 



