1903.] Hay, Cretaceous Fishes from Mount Lebanon, Syria. 45 I 



common to this place and Hakel. This indicates that the 

 fish-bearing beds of these two locaHties are on nearly the 

 same geological level. In case the deposits are not synchro- 

 nous, can we reach any conclusion regarding their relative ages ? 

 We observe that the Hajula fauna is related to that of 

 Sahel Alma by the presence of three genera which are not 

 found at Hakel, viz., Sclerorhynchus, Rhinellus, and Pycno- 

 sterinx. Furthermore, that pycnodonts, especially abundant 

 during the Jurassic, are well represented at Hakel, but by 

 only a single species at Hajula; that, of Pseudoheryx, there 

 are three species at Hakel, and only one, so far as we know, 

 at Hajula. While too great reliance must not be placed on 

 these observations, they appear to indicate that the beds at 

 Hakel are the lowest ; that these are followed at no great dis- 

 tance by those at Hajula; and that those at Sahel Alma are 

 considerably above the latter. That the latter beds are 

 higher in the series than those at Hakel has been the conclu- 

 sion of most geologists. This is further confirmed by the 

 occurrence of Macrosemiidae, one oligopleurid, and many 

 pycnodonts at Hakel; while at Sahel Alma there are few or 

 none of these, but many Berycidae, altogether 12 species. 

 The large number of sharks found at Sahel Alma, mostly be- 

 longing to living genera, may be regarded as indicating a 

 more recent time than that during which the beds of the 

 other localities were deposited. 



Explanation of the Abbreviations employed on the Plates. 



a. f. anal fin. d. r. dorsal fin ray. 

 ant. pr. anterior transverse pro- d. sc. dorsal scutes. 



cess {Leptotrachelus). ep. hy. epihypocentrum. 



br. branchiostegals. h. a. hfenial arch, 



br. ar. branchial arches. hy. hyoid. 



c. f. caudal fin. hym. hyomandibular. 

 cl. clei thrum. int. intestine. 



cran. cranium. i. op. interoperculum. 



cr. sc. crimped sc3.\es,{M icrocaelia) . lat. sc. lateral scutes, 



den. dentary. mes. pt. mesopter5-goid. 



derm. sc. dermal scutes. met. pt. metapterygoid. 



d. f. dorsal fin. mo. mouth. 



