73 



and (6) a series of more or less light forms from Kent and 

 Sussex. 



Messrs. Dennis, Rayward, Edwards, and Turner also 

 exhibited series of the same species, from various southern 

 localities, but all were of the ordinary forms usually met with. 



In the discussion which followed it was noted that all the 

 southern specimens retained the light-coloured hind-wing 

 however dark the fore-wings might have become, while in the 

 dark var. fuscata the hind-wings were invariably also darkened. 

 In all the specimens exhibited except var. fuscata the sub- 

 marginal row of light wedge-shaped spots were always 

 distinctly present, while in the var. not a trace of them was 

 to be found. It was also remarked that there was a tendency 

 in many specimens for the discal spot to touch the margin 

 of the transverse band. There were no forms exhibited 

 intermediate between the ordinary forms and the var. which 

 in any way could be designated as near var. fuscata. 



Mr. Manger exhibited a specimen of Eudccmonia brachyura 

 from Sierra Leone, a species in which the hind-wings were 

 developed into extremely long tails. 



Mr. Priske exhibited a specimen of H elops striatus, in which 

 the left antenna was bifurcated about one third of its length 

 from the apex. The two arms of the fork appeared to be 

 equally developed. 



Mr. H. Main exhibited specimens of Limulus and Scorpio, 

 the latter from India, West and South Africa, and remarked 

 on the various theories of the position of the former in the 

 natural kingdom. The early view held was that Limulus 

 should be called a Crustacean. It occurs in the warmer 

 waters of the east coast of America, the East Indian Archi- 

 pelago, and the western shores of the Pacific, living in from 

 two to six fathoms, in mud or sand, feeding on worms, and 

 sometimes attaining the length of several feet. A thick 

 chitinous shield produced laterally into two backwardly 

 directed processes covers the anterior region of the body, 

 which bears six pairs of appendages. Behind this there is 

 an abdominal region enclosed in a shell with lateral spines, 

 while a long pointed spine extends behind. 



By a series of diagrams it was pointed out how the regions 

 of the body of Limulus and a scorpion agreed, the same 

 number of segments being identified in each, the eyes and 

 appendages being also quite comparable. The gills of 

 Limulus were homologous with the lung books of Scorpio. 

 The absence of antennae in both is noteworthy. The aquatic 

 habit and the breathing by gills are the more noticeable 



