84 



VEKTEBKATA. 



No. 313. Cephalaspis Lyelli, Agass. 



Body and Head, on slab. This well-known Devonian 

 Fish is placed by Agassiz, Owen, and Pictet among 

 the Placoganoids ; but Huxley says it is uncertain 

 whether the C. was a Ganoid or Teleost. The charac- 

 teristic ganoin-layer is absent ; the dorsal scales are 

 rhomboidal. The first specimen of this genus was 

 discovered by Hugh Miller. The most striking fea- 

 ture is the enormous buckler (made up of plates usu- 

 ally hexagonal), covering the head and prolonged 

 backwards into lateral points. The head comprises 

 fully one-third the creature's entire length. The body 

 was protected by plates arranged transversely, and the 

 tail carried a heterocercal fin. The dentition is un- 

 known ; but the mouth was probably placed beneath 

 the head and suctorial, as in the Sturgeon. The eyes 

 were placed closely together near the middle of the 

 head. This fossil, now in the British Museum, was 

 found in the Old Bed Sandstone in Forfarshire, Scot- 

 land. Size, 9x5. Price, $1.50. 



No. 314. Sauropsis longimaims, Agass. 



Body and Head, on slab. This homocercal Ganoid is distinguished by very 

 short, numerous vertebras, scales slightly rhomboidal, small dorsal and well devel- 

 oped pectoral fins. The specimen — somewhat doubtful and problematic in charac- 

 ter — was found in the Lithographic slate (Upper Oolite) at Eichstadt, Bavaria, 

 and belongs to the private Geological Cabinet of Mr. Ward of Bochester. 



Size, 17 x 7. Price, $2.00. 



No. 315. Lepidotus maximus Wagn. 



mULUL-l 





Scales, on slab. This Ganoid had 

 highly polished, imbricated, rhomboid 

 scales, a short dorsal fin opposite the anal, 

 and a homocercal tail. The vertebrae were 

 well ossified, and the teeth were blunt. 

 This specimen, from the lithographic slate 

 (Upper Oolite) at Solenhofen, Bavaria, is 

 in the Museum of the University of 

 Munich. Size, 20 x 15. Price, $3.50. 



No. 316. Lepidotus oblongus, Agass. 



Posterior part. This Fish had small scales, and a large tail, the inferior 

 lobe of which is more developed than the upper one. The tail, says Agassiz, is 

 very interesting, as it enables one to see how the inferior spinous apophyses are 

 developed in the homocercal Ganoids, whose vertebral column is prolonged into 

 the superior lobe. The original is from the Lithographic limestone (Upper 

 Oolite), Solenhofen, Bavaria, and belongs to the private Geological Cabinet of Mr. 

 Ward, Rochester. Size, 18 x 11. Price, $3.25. 



