of the Mauritius. 129 



Mr. Delisse, jun. has exhibited to us, a figure from nature of the 

 common Grapaua piclns. 



INSECTS. 



Although this class, compared with others, occupies the attention of a 

 greater number of Naturalists, on account of its really startling extent, 

 yet we have been favoured with only one discourse on Entomology. Mr. 

 J. Desjardins read a description ami history of the transformations of the 

 Coccinella Sulphurea (Oliv.), known here by the name of Poule du 

 (Son Dieu. 



Different members have brought to the Society, insects of the different 

 orders, which have been the subject of verbal dissertations; and Messrs. 

 Bojer and Desjardins have examined and illustrated verbally, figures of 

 insects sketched by various individuals, and especially by Lieutenant 

 Beaufoy of the 29th Regiment. Dr. Lyall has also given us an account 

 of a collection of insects from Madagascar, which he exhibited to us. 



MOLLUSCA. 



N'o country could be more conveniently situated than ours for the study 

 of these animals, of which the solid part or shell forms the delight of so 

 many amateurs, and of which the internal organization is so admirable, 

 that by Physiologists they have been placed in a rank superior to that 

 of the Insects and Crustacea. , 



The Mollusca properly so called, and also the order of Gasteropodes, 

 of Lamarck, have frequently occupied the attention of the Society. The 

 two Messrs. Licnards (brothers) have read five papers upon these animals. 

 Mr. Lienard (ainC) in one of these memoirs, described five species of 

 Doris, and to one, which he reckoned to be new, lie has affixed the new 

 name Dfargiaata. 



At another silting, lie described a l'leurobranchus, and afterwards 

 another Doris. 



Mr. Lienard (cadet) read the description of a Dolabella, and, as lus 

 brother had done, ho explained its nnatomy. The three stomachs of thsse 

 animals, which contain horny substances for the trituration of their food, 

 as well as the operculum, which covers the organs of respiration, are 

 objects of little value to the generality of shell collectors, who almost 

 always neglect the most philosophic part of natural history. 



Another Doris, different from those already alluded to, was also the 

 subject of a description by our colleague. 



CIRUHIPIDES. 

 An Ajnatifia, closely allied to the A. Striata, but sufficiently distinct 

 from it, has been named by Mr. J. Desjardins, A. Mauritiaua, and was 

 the subject of a paper by him. 



RADLVTA. 



Mr. Sevenncs, one of our young associates, read a detailed description 

 of a Fistularia, which is found in the Madreporic Detritus of our shores, 

 and which he discovered in October last, on the shore, in a living state. 



One genus of this class of animals has been noticed by Mr. Lienard 

 (cadet), who has described a Cephcus, (Lamarck), which ho names 

 C. Lamillosa, on account of the foliaceous plates which cover the under- 

 side of its arm. We owe the knowledge of this production to our young 

 associate. 



