70 Mr. IT. G rose- Snii til on neio 



remnant of a vertebral column are a number of impressions of 

 polygonal angular scutes, best seen in the London half of the 

 .specimen, three of which are represented in Pi. I. fig. 4, 

 magnified three diameters, and which display the imprint of 

 a characteristic ornament, namely of finely tuberculated 

 ridges radiating from the centre of each plate. 



It is difficult to give any opinion as to the true zoological 

 position of this remarkable fish-fragment, though desirable to 

 name and record it, in the hope that additional specimens may 

 at a future time turn up to throw more light on its nature. 

 ]\leanwliile the specimen is interesting as showing the oldest 

 vertebral centra as yet known. It is also of special interest 

 to geologists to know that the genus apparently existed also 

 in Upper Silurian times, as Mr. Smith Woodward recently 

 kindly showed me a portion of Ludlow '' Bone Bed " 

 (T. T. Lewis Coll. Brit. Mus. P. 8929) on which a little 

 scute is seen which, generically at least, cannot be distin- 

 guished from the scutes of the Farnell specimen, the principal 

 difference being that the latter are squeezed quite flat, while 

 the Ludlow specimen is elevated in the centre. 



I must here also thank Dr. Woodward and Mr. Smith 

 Woodward for their kindness in allowing me to make use of 

 the specimens in the British Museum. 



EXPLANATION OF PLATE I. 



Fig. 1. Psmnmosteus cmglicus, Traq., natural size. 



Fig. 2. Impression of sculpture of outer surface of the same plate, mag- 

 nified live diameters. 



Fig. 3. Protodiis scoticus (E. T. Newton), magnified three diameters. 



Fig. 4. Impressions of outer surfaces of three of the scutes of Farnellia 

 tuberciilata, Traq. 



X. — Descriptions of new Species of Butterflies from South 

 America. By H. Grose-Smith, B'.A., F.E.S., F.Z.S., &c. 



Heliconius molina. 



Male. — Upperside. Both wings brownish black, suffused 

 with shining dark blue. Anterior wings with an oblique 

 crimson band at the end of the cell, which it partially 

 invades, crossing the middle of the disk to a little below the 

 lowest median nervule, on which it is rather widest. Poste- 

 rior wings with the costal margin broadly pale cinereous 

 brown. 



Underside. Both wings dark brown. Anterior wings with 



