from the Coal Measures of Laurash'u'e. 471 



longitiuliual rows of large tubercles and a line of dorsal 

 spines is unknown in any described p^enus, nor is there any 

 })arallel in the family for the remarkable development of the 

 fulcra into which the ridge-scalcs are transformed as they 

 approach the median fins. A new genus must therefore be 

 established for this strongly differentiated form, and in 

 allusion to the prominent snout I propose for it the name 

 Phanerorhijnchus. The species represented by this specimen 

 1 p opose to name P lianerorJujnchus armatus. 



Note on the preceding Paper. By D. M. S. Watsox. 



At ;Mr. Gill's suggestion I have made an independent 

 examination of the head of the unique specimen of Fhanero- 

 rhynchus. The matrix which lay within the head, attached 

 to the right side, showed impressions of certain bones of the 

 ])alate ; these had been so much broken by the original 

 splitting of the nodule that is was quite impossible to gain 

 any useful information from them : I therefore removed the 

 ^vhole mass, leaving exposed a beautiful impression of the 

 whole right surface of the head. In the main this merely 

 confirms ]\Ir. Gill's account, but does bring out certain 

 features moi'e clearly. 



The sutures between the parietals, frontals, and supra- 

 temporals are not clearly visible. Together these bones 

 form a strongly arched roof to the skull, presenting a long 

 free border to the operculum ; this lateral border is thickened 

 and rounded. The supratemporal appears to be perforated 

 by a foramen for an otic branch of the 9th or 10th nerve. 

 Behind the parietals lies a single pair of bones representing 

 the tabular ])ostparietal row. Behind these lies what is 

 apparently a single very large scale, the first of the dorsal 

 series. 



The rostrum shows no trace of subdivision into separate 

 elements. As ^Ir. Gill has described it, it forms a long- 

 massive projection, continuing the head forward in advance 

 of* the mouth. The olfactory pit lies entirely on its side, 

 showing that the bone actually exposed is a cariilage-bone 

 in the ethmoidal region. The whole appearance of this 

 rostrum with its olfactory pit is precisely tliat of the carti- 

 laginous rostrum of Acipenser. The structure here differs 

 very markedly from that in an ordinary Pal^eoniscid. 



On the side of the head is a large, nearly square antorbital, 

 which articulates with the frontal above, the maxilla below, 

 and apparently with a bone of the orljital mai-gin behind. 



