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Pristis. It "was interesting to note also that these teeth were not fixed rigidly 

 dt right angles to the "saw" as in the adult, but were movable, directed back- 

 ward, and lay pressed close against each side, thus protecting both foetus and 

 parent during parturition. Another fact that was worthy of mention was that 

 the subrostral tentacles were about twice as long in the foetus exhibited as 

 they are in the mature fish. — Mr. Stead also exhibited the right chela of 

 a large Mangrove Crab, Scylla serrata Forskäl, the dactylus of which was 

 very curiously malformed. In addition to being considerably dwarfed, there 

 was a large vertical outgrowth from its upper border, resembling closely an 

 open "nipper", even the teeth being present. — Mr. H. Leighton Kesteven 

 contributed a note upon certain members of the molluscan Family Rissoidae^ 

 showing that Rissoa pctierdi Brazier, recorded from New South Wales 

 without definite locality, occurs in Port Jackson, as does, also E. hicolor 

 Petterd, another southern species, which had been dredged ofi" the coast by 

 the "Thetis". The names R. beddomei Tate (= R. flamia Beddome), and 

 R. sophiae Brazier, are shown to be synonyms oîR. flammea Frauenfeld; and 

 R. australe Frauenf. , R. oojiroleuca Braz. , R. mixta Tate , and R. ajncüirata 

 all apply to the same species. — 3) Notes on the Hymenopteroiis Genus 

 Mcgalyra, with Descriptions of new Species. By W. W. Froggatt, F.L.S. 

 — A general account of the members of this curious genus of parasitic hy- 

 menoptera is given, with notes on the specis previously described, their 

 general structure, and the longicorn beetles whose larvae they parasitise. 

 Eight new species are added to the seven previously described from Australia. 

 The collection studied comprised specimens from Australian museums and 

 from various private collections , and was probably the finest series of these 

 rare parasitic wasps ever brought together. — 4) Description of a new Tick 

 of the Family Argasidae. By W. W. Froggatt, F.L.S. — The common 

 "fowl-tick,'' Ärgas americanKS , has been acclimatised in Australia for more 

 than twenty years. An indigenous species is now described. This Argasid 

 is common in the clay nests of the Fairy Martin, Pctrochelidon [Lagenoplastes] 

 ariel^ and is usually to be found under the lining of feathers and grass resting 

 against the clay in the nests containing the young birds, and for some time 

 after the nestlings have flown. Specimens of it, in the Macleay Museum, 

 were collected by Mr. George Masters in Queensland forty years ago. — 

 5) The Life-History oî Lestes leda. By R. J. Tillyard, B.A. The species 

 is shown to be double-brooded. The male assists the female in the act of 

 oviposition, seizing her round the neck. The method of oviposition is dis- 

 cussed, and various statements that have been made by different entomolo- 

 gists from time to time are shown to differ from the results of observations 

 on this species. The egg is torpedo-shaped. The larva-nymph is carefully 

 described, and a wide range of variations in colouring noted. Special atten- 

 tion is given to the description of the three beautiful caudal gill-plates, 

 which are no longer indispensable for respiration and are not found now ex- 

 cept in the larvae of two of the Odonate families. The emergence of the per- 

 fect insect from the nymphal case is described from observations on some 

 hundred or more larvae, carefully reared in captivity during the past two 

 years. The colouration of the newly-emerged insect is noted, and also the 

 gradual change of colouring , leading finally to the blue and bronze of the 

 perfect insect a week or so after emergence. The paper marks a new depar- 

 ture in Australian entomology, being the first life-history of an Australian 

 Odonate to be recorded. 



