28 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Nov. 21, 



six wide thoracic rings, somewhat falcate at their outer extremities ; 

 but the number of joints of the abdomen, the position of the eyes. 



Figs. 1-7. — Diagrams q/* Himantopterus. 



1. H. bilohus ; half the nat. length ; position of the jaws, on the ander side of 

 the head, indicated at a. 



2 a, one of the jaws and its scale-like markings ; 2 Z», a portion magnified, 



3. H. maximus ; part of the head, oiie-fifch the natural length. 



4. H. acuminatus ; tail-joint, one-third the length. 



5. H. lanceolatus ; last two joints, about one-half the natural size. 



6. H. perornatus ; part of three thoracic rings, to show the falcral point and 

 the scale-like sculpturing on the forward half. 



7. Scale-like appendages ; many of these lie loose on the surfaces of stone in 

 which the fossils occur. 



and the appendages are not known ; and we should not be justified 

 therefore in uniting the two forms on such fragmentary evidence. 

 From the figure I should suspect the eyes are lateral, as in Himan- 

 topterus ; the sculpture is like that of our fossils, and the size not 

 less than that of our smallest species. 



There are five species of Himantopterus in the Lanarkshire locality, 

 and one from South Wales, already known. 



