Mr. A. S. Woodward — Palceichthyological Notes. 285 



The external ornament consists of large ganoine-coated 

 tubercles arranged in irregular longitudinal series, often partly 

 ^vanting ; and a regular series of these tubercles, somewhat 

 enlarged, pointed, and hooked downwards, is arranged along 

 the postero-external margin of the spine. As shown by other 

 specimens, the hinder face is flat or slightly concave, and the 

 transverse section of the spine thus precisely resembles that of 

 the dorsal spine of the recent Ghimmra. 



3. On Gyrolepis dubius, sp. n.^from the Rhcetic Formation 

 of Scania. 



So far as fragmentary specimens admit of being compared, 

 it appears that the Rha^tic fish-remains of Southern Scania, 

 Sweden, are very similar to those of Britain and Germany *. 

 In the collection of the Geological Survey of Sweden, 

 however, there is one large fragment of a ganoid fish that 

 does not appear to have been discovered elsewhere ; and the 

 writer is indebted to the kindness of Dr. N. Olaf Hoist for 

 the opportunity of closely studying the specimen. 



The fossil in question exhibits only a large portion of the 

 squamation in impression, with a few imperfect scales and 

 part of the dorsal fin ; and the large dimensions of the fisli 

 are indicated by PI. X. figs. 10-12, which show respectively, 

 of the natural size, part of the squamation, an isolated scale, 

 and part of the dorsal fin-rays. The flank-scales, as observed 

 in the imperfect impression (fig. 10), are scarcely, if at all, 

 deeper than broad ; and the few scales that remaui exhibit a 

 narrow overlapped anterior margin, with a nearly smootii 

 external ganoid face, only marked by some small punctuations 

 and by a few short oblique wrinkles at the anterior border 

 (fig. 11). Whether or not the scales were serrated cannot be 

 determined; and though the peg-and-socket articulation can 

 be distinctly seen, the inner vertical rib appears to be feeble. 

 The rays of the dorsal fin (fig. 12) are stout and closely 

 articulated, and each joint is ornamented with two or three 

 longitudinal streaks of ganoine. 



It is, of course, not possible to determine the generic 

 position of so fragmentary a fossil with certainty ; but it will 

 probably prove to belong to Gyrolepis. The provisional 

 name of G. duhius is therciore proposed for the fish in 

 question, the characters of the scale-ornament and fin-rays 

 distinguishing it from the known species of Gyrolepis. 



* ]5. Lundgren, Minneskr. Kong. Fysiogr. Siill.sli. Liiiitl, no. v. (1888). 

 Ann. t£- Mag. N. Hist. Ser. 6. Vol. xii. 22 



