AECHEGOSATJEID^;. 1 85 



broad, with an extreme length of about 0,150 (6-2 inches) in adult 

 specimens. Teeth with a small basal swelling, and foldings in the 

 osteodentine. A ridge running from each orbit to the nares 

 forming the boundaries of a median depression. 



So far as the writer can see there appears to be no reason for 

 departing from Gaudry's original identification of the French form 

 with Archegoscmrus latirostrls. Fritsch l has, indeed, regarded the 

 latter as inseparable from Sclerccephalus hceuseri, Goldfuss, but 

 that identification falls to the ground if Weissia be generically 

 identical with the latter. The elongate form of the nares in the 

 type specimen is probably due to imperfection. 



Hab. Europe (Germany and France). 



R. 1299. A split nodule showing the skull of an immature indi- 

 (Fig.) yidual ; from the Rothliegendes (Lower Permian) of 

 Lebach, near Saarbriick, Rhenish Prussia. In this 

 specimen (fig. 45) the sculptured lamina of bone is adherent 

 to the counterpart. It cannot be specifically distinguished 

 from the larger imperfect type skull figured by Meyer in 

 the ' Palaeontographica,' vol. vi. pi. x. figs. 2, 3. 



By exchange, 1888. 



R. 1605. Slab of shale showing the skull and thoracic buckler, in 

 an imperfectly preserved condition ; from the Eothlie- 

 gendes (Lower Permian) of Muse, near Autun (Saone-et- 

 Loire), France. Of the skull the frontal aspect is shown, 

 with the loss of most of the superficial layer of bone. 

 This skull — which agrees in all respects with the one 

 figured by Gaudry in his c Enchancements &c., Fossiles 

 Primaires,' p. 265, fig. 261, as Actinodon frossardi, — is 

 specifically indistinguishable from the preceding, although 

 of larger size. In both, the orbits and nares have the 

 same relative size and dimensions ; and the preorbital 

 ridges and median dispersion are equally clear in both. 

 In the present specimen the boundaries of the individual 

 bones are visible, and these agree precisely with the figure 

 of the type of Archegosaurus latircstris. Purchased, 1889. 



R. 1085. Cast of a slab of shale exhibiting the dorsal aspect of an 

 entire skeleton, in an imperfectly preserved condition, 

 referred by Gaudry to Actinodon frossardi. The original, 

 which is preserved in the Museum at Paris, was obtained 



1 Fauna cler Gaskohle, toI. i. p. 65. 



