XXXll PROCEEDINGS OF THE 



by Mr. Westwood and Dr. Grube, and a notice of some points in 

 regard to which his observations, differing from these, showed a 

 yet closer agreement with the larva of the Hemerohn, the ana- 

 logy between the animal of the sponge and the winged Sisyra, 

 particularly as regards the alimentary canal and its appendages, 

 was contrasted with the modifications which these undergo in 

 Hemerobhis during the course of its transformations. The analogies 

 in detail between the two sorts of larva chiefly relied on, were in 

 the number and position of the eyes, the structure and connec- 

 tion of the two pairs of jaws, the double outlets of the aesophagus, 

 and the number and arrangement of the malpighian vessels. The 

 signal differences between this animal and the larva of Hemerohius, 

 and the analogy it bears to SiaUs, in the presence of jointed 

 branchiae, were considered in relation to its aquatic life and its 

 mode of nutrition. The frequency of the perfect insect about 

 the places where the animal of the Spongllla has been found, was 

 also adverted to in corroboration of their probable relation. 



Some remarks w-ere added upon another Neuropterous insect, 

 the Coniopteryx tineiformis of Curtis, maintaining the theory of 

 Messrs. Westwood and Wesmael, of its affinity to the Hemeroh'ii, 

 against Dr. Burmeister, who has classed it with Psocus and Termes 

 amongst his Corrodentia, insects which pass through an incomplete 

 metamorphosis ; in which classification he has been followed by 

 Dr. Rambur, 



This insect, which undergoes a metamorphosis very similar to 

 that of the Hemerohii, was shown also to agree with these in im- 

 portant characters of internal structure, although with such differ- 

 ences as may perhaps justify its being retained as the type of a 

 distinct family, the place of which cannot be far from the Heme- 

 rohii. 



The paper was illustrated by numerous anatomical drawings, 

 and gave rise to a lengthened discussion. 



Q>th March, 1848. 

 W. Spence, Esq., F.R.S., President, in the Chair. 

 Donations. 

 Proceedings of the Royal Society, parts 59 — 69. Presented 

 by that Society. 



Five hundred copies of the President's Address at the Anni- 

 versary Meeting of the Society. Presented by the President for 

 distribution amongst the Members of the Society and their friends. 



