SEXUAL CHARACTERS — ELASMOBRANCH FISHES 

 RHINOBATUS INTERMEDIUS 



197 



It was not until a much later date that the skates arrived. 

 These appear to resemble recent forms, and some are even as- 

 signed to existing genera. Figure 4, to be compared subse- 

 quently with a modern species of Rhinobatus, is drawn from the 

 specimen 49516, from the upper cretaceous at Sahel Alma, Mount 

 Lebanon (Lewis collection). It does not follow that the primi- 



Fig. 5 Cyclobatis oligodactylus. cl., clasper; B., basiptorygium 



tive forms possessed a clasper gland as do their modern congeners, 

 but at least such a corollary is probable. The specimen gives 

 indications of a well-developed rhipidion. 



CYCLOBATIS OLIGODACTYLUS 



Also from the upper cretaceous, Hakel, Mount Lebanon, is the 

 small and well-preserved specimen P 601 (Egerton collection). 

 Originally described as resembling the Torpedinidae, but now 

 knowTi to be related to the Trygonidae, figure 5 does no more 



