Eastman: Jurassii Saurian Remains Within Fish. 186 



facial bones, and vertebral centra would seem to be preserved partly 

 in the form of an impression, parti} as structures in which the external 

 surface has been eroded away, or removed l>y chemical action. 



The fish itself would not be remarkable, except for the circumstance 

 that it happens to contain the skeletal remains of a small Rhyncho- 

 cephalian reptile, probably Homceosaurus, within the abdominal 

 cavity. The prey had been gulped down head first, and may have 

 caused the death of the fish, .is the digesth e process had not advanced 

 far enough to dismember the limbs nor to disturb the natural position 

 of parts beyond a slight lateral compression of the trunk. The 

 surface characters of the head are shown with tolerable distinctness, 

 a depression is indicated which may be the pineal foramen, and a few 

 slender teeth art' exposed on one side anteriorly. The vertebral 

 column n\ the reptile is preserved for some distance beyond the sacral 

 region, and some of the anterior limb-bones are clearly visible. It is 

 hoped that the accompanying plate (PI. X) may aid in rendering the 

 above-described conditions more intelligible to the reader. 



The second specimen referred to, which is worthy of notice in this 

 connection, likewise forms part of the Bayet collection, and was 

 derived from the same horizon and locality as the first. It is a very 

 complete teleostean skeleton, having a total length of 19 cm., and is 

 preserved in the form of remarkably sharp counterpart impressions in 

 a slab of lithographic limestone. The systematic position of the fish 

 represented is very close to that of the type species of the so-called 

 genus Attakeopsis, established by Victor Thiolliere in 1858, but re- 

 garded by the late Karl von Zittel, Dr. A. Smith Woodward, and others 

 as identical with the earlier described Oeonoscopus of O. G. Costa 

 (Ittiol. Fo>s. Italia, 1853, p. 2). The example under discussion 

 appears, however, to present more than individual differences from 

 tin solitary known species of Oeonoscopus occurring in the Cerin lith- 

 graphic limestone, and is accordingly regarded as representing a dis- 

 tinct species. 



The distinguishing characters of the new form, which may be desig- 

 nated as ". elongatus, are included in the following brief diagnosis: 



Oeonoscopus elongatus, sp. riov. 



(Plate XI.) 



Type. — Nearly complete fish in counterpart: Carnegie Museum 

 Cat. Nos. 4079 + 4079a. 



