230 On the " Seraphim " and its Allies. 



fish was, in reality, the remains of an enormous crustacean ; 

 and the supposed scales were surface markings on its shell. 

 Although unable correctly to determine the nature of the 

 fragments which he figured in Plate A of his Fossil Fishes, 

 Agassiz yet most justly concluded to place it " between the 

 Trilobites and the Entomostraca," making it the type of a new 

 family, and including with it Eurypterus and Eidothea, two 

 fossil genera since shown to be closely related to Pterygotus.* 



In 1855, Professor McCoy published in Sir Charles Lyell's 

 fifth edition of his Manual of Elementary Geology, p. 420, a 

 restored figure of Pterygotus problem.aticus, Agassiz, which, 

 now that wc have a more correct notion of these queer-looking 

 f< Hows, seems very much like a funny caricature, suck as Edward 

 Forbes not unfrequently indulged in. 



In September of the same year, Mr. Robert Slimon read a 

 paper before the British Association at Glasgow,f on the 

 Geology of Lesmahagow, Lanarkshire, and exhibited a collec- 

 tion of Pterygoti and other associated fossils from Logan 

 Water, which Mr. Salter described and figured soon afterwards 

 in the Quarterly Journal of the Geological Society^ (vol. xii., 

 1856), with a Report on the Geology of Lesmahagow by Sir. 

 R. I. Murchison, in which Mr. Slimon^s observations are 

 embodied, and his labours as a geologist are honourably and 

 deservedly mentioned. In fact, but for the zeal of that 

 gentleman, we might to this day have remained unacquainted 

 with some of the most perfect and wonderful specimens of the 

 tribe. 



The foregoing is a nearly complete bibliography of Ptery- 

 gotus to 1859, when Messrs. Huxley and Salter published in 

 Memoir No. 1 of the Geological Survey, their monograph, com- 

 prising eleven species of Pterygoti (and one of Eurypterus), 

 and illustrated by sixteen folio engravings, and many wood- 

 cuts. 



On referring to Page's Advanced Text-Pool; second edition, 

 also published in 1859, although the old generic name .lliman- 

 toptems§ is retained, and some other inaccuracies repeated, 



* In June, 1862, Mr. J. W. Salter published in the Quarterly Journal of 

 the Ghologiool Society, vol. viii., p. 386, an account of the chelate limbs of Fieri/- 

 gotut probU motions, from (lie U. Ludlow Hock of Herefordshire. 



t Mr. David Pago also read a paper on the " Seraphim " of the Old Red Sand- 

 stone at the same meeting, and exhibited a restoration of it. His observations 

 have been reprinted in the Advanced Text- Book of Geology, .1856, p. 135. 



J Under the generic name of ffimantopterut, four species are described: — JT. 

 lilobus, H. ptfornatut, II. "Banktii, II. lanceolatus; and two Pterygoti — /'. 

 acuminata* and moximue, In IS.M!, Mr. Sailer also read a paper at tlic British 



Association Meeting on the great Pterygotus of Scotland, and other ipecies. 



§ This name having Keen already used to express s genus of Lepidopteroua 

 inscctB, could not, according to the rules of tlio JJritiah Association, be retained 

 for a section of the Pterygoti. 



