72 ' MONOGKATH OF DUKA DEN. 



juissage for tbe numerous minute sanguinary vessels which traverse the body, 

 and allow the scale to adhere to the epidermis or outer skin. When examined 

 through a microscope, the scales present a thick bed of enamel, under which 

 we find an osseous tissue, showing a very beautiful net-work, differing only 

 from the Pohjpterus in its greater development, and in many respects resem- 

 bling the scaly cuirass of the new genus Gt/roptychius. Two large, sharp- 

 pointed teeth project from the outer edge of the lower jaw, and there are also 

 distinct traces of several smaller teeth in the posterior margin. 



This new species of diplopterus has been named the Dal- 

 gleisiensis, in honour of the much respected proprietors of 

 the lich fossihferous deposit of Dura Den, whose kindness to 

 all who visit the localit}^ is so justly appreciated, and whose 

 liberality in distributing specimens among our public museums 

 and the private collections of the scientific is so beneficially and 

 widely experienced. 



A single tooth of Bendrodus, it remains only to be noticed, 

 is all of this genus yet detected in the Dura sandstone. It 

 measures about an inch in length, and is nearly a fourth part 

 of an inch broad at the root. It is sharp-pointed and curved 

 downwards, and hollow in the posterior end. It is figured in 

 Fife Illustrated, along with other characteristic fossils of Dura 

 Den. Several scales of Phyllolepis concentricus have also been 

 discovered in the deposit, and one of them has been described 

 to me as being three inches in length by two in breadth. Nor 

 are coprohtes of large size wanting to attest the existence of 

 perhaps creatures of still huger dimensions, and of more pre- 

 daceous habits. Still our list is large ; and whatever may be iu 

 store for future explorers in this rich field of fossil research, our 

 numerous visits, extending now over a large period of time, 

 have been no less amply rewarded than they have been the 

 occasions of much delightful recreation — of many pleasing 

 hours in acquiring useful knowledge— of many opportunities 

 of cultivating and renewing agreeable friendships— and, above 

 all, of privileged times in deepening our feelings of admira- 

 tion for the works of the Gkeat Divine Contriver and Head 

 OF All. 



