432 Davis — On the Fossil Fkh of the Ci'etaceous Formations of Scandinavia. 



0-035 m. in length, extends between the occipital and the anterior vertebrge, and 

 represents the scapular bones {sc). The operculum probably occupied this area, 

 but has entirely disappeared, unless the fine bone {op.) be a transverse section 

 of it. 



The spinal column is represented by eighteen vertebrae. A space between the 

 head and the first vertebra preserved forms an interval requiring six or seven 

 vertebrae to fill it. The vertebra; are 0-005 m. in length and 0-006 m. in height, 

 in this respect differing much from those of Derectis {Leptotrachelus) triqueter, 

 Pict. & Humb., from Mount Lebanon, in which the vertebrae near the head are 

 twice as long as high. The vertebrae are constricted in the middle, and well 

 ossified. (PI. XLV., fig. Ic.) 



The scutes have, at least, two forms ; one represented by fig. 1 a is probably 

 from the median lateral line ; the front consists of a pointed prolongation of the 

 median axis ; on each side are aliform expansions of the surface, whilst the 

 j)Osterior margin is made up of a pair of projections, one on each side the median 

 line of the scute. The pointed prolongation of this scute may have been 

 perforated by the canal of the lateral line. Mr. A. Smith Woodward has figured 

 an example of a scute of Dercetis elongatiis, Agass.,* from a flint-nodule found in 

 the Chalk of Norfolk, England, which exhibits this peculiarity very beautifully. 

 A second form on the specimen from Limhamn is represented by fig. 1 h, and is 

 from the dorsal surface ; it varies considerably from the lateral scute, and, so far 

 as can be observed, extends from the median dorsal line, with the point towards 

 the lateral line, a corresponding scute opposing it, and extending in the opposite 

 direction. The two series of opposing scutes in the example figured may be seen 

 to some extent enveloping the vertebral column, and extending from it on each 

 side, with the j^oint outwards. 



The form and character of the scutes, together with the vertebrae, separate this 

 species from those previously described, and I indicate it sjiecifically by the name 

 of the district from which it was obtained. 



Formation and Localities. — Etage Danien : Saltholm Limestone : Limhamn, near 

 Malmo, in Schonen. 



Ex coll. — Lund University Geological Museum. 



' Proc. Geol. Association," vol. x., p. 318, pi. i., fig. 7. 



