THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTOEY. 



[FIFTH SERIES.] 



" per litora spargite museum, 



Naiades, et ch'ciim vitreos considite fontes : 

 Polliee virgiueo teneros h'lc carpite flores : 

 Floribus et pietiun, divae, replete eanistrum. 

 At Tos, o Nymphse Craterides, ite sub undas ; 

 Ite, reeiirvato Tariata corallia trunco 

 Vellite muscosis e rupibus, et niihi conchas 

 Ferte, Deae pelagi, et pingui eonehylia succo." 



N.Parthenii Gianneftasii Eel. \. 



No. 7. JULY 1878. 



L — On the Genera Dipteriis, 8edgw. & Murch., Palsedaphus, 

 Van Beneden and De Koninck^ Holodus, Pander^ and Chei- 

 rodus, M' Coy. Bj R. H. Traquaie, M.D., F.G.S., Keeper 

 of the Natural- History Collections in the Museum of Science 

 and Art, Edinburgh. 



[Plate III.] 



I. DiPTERUS, Sedgwick and ]\Iurchison. 



The genus Dipterus of Sedgwick and IVIurchison was clas- 

 sified by Agassiz first in his family of Lepidoides*, and after- 

 wards in that of the Sauroides Dipteriens t, in which latter it 

 was associated with such rhombic- scaled genera as Osteolepis^ 

 Di2}loi)terus^ and Glyptopomus. In fact Agassiz himself be- 

 lieved that the scales of Dipterus were rhoraboidal. The 

 cycloidal shape and imbricating arrangement of its scales, 

 however, were pointed out by M^Coy |, who accordingly 

 placed it among the " Coelacanthi " (^^ e. cycliferous Crosso- 

 pterygii according to modern ideas), and also doubted the 

 propriety of separating Glyiytolepis from it, although the 

 very peculiar dentition of Dipterus had been already disco- 

 vered by Hugh Miller §. But the incorrectness of M 'Coy's 

 ideas upon this latter point was immediately afterwards 



* 'Poissons Fossiles,' vol. ii. pt. 1, pp. 3 and 112. 

 t 'Poissons Fossiles du vieux Gres Kouge,' pp. 47, 49, and 58. 

 \ ' British Paloeozoic Fossils,' pp. 590-5t>;3. 



§ 'Witness' Newspaper, Dec. 23, 1848; 'Footprints of the Creator/ 

 Edinburgh, 1850. 



Ann. & Mag. N. IL'sf. Ser. 5. Vol. ii. I 



