118 THE ZOOLOGIST. 



structure from the abdominal portion, and, in addition to lateral diverticula, 

 has two median ventral diverticula. The coxal gland opens at the base of 

 the third pair of appendages, and a sensory organ of unknown function 

 occurs on each side of the last segment. An interesting discussion followed, 

 in which Mr. R. J. Pocock, Mr. H. M. Bernard, aud the President took 

 part, and Mr. Laurie replied. 



A paper was then communicated by Mr. W. West, " On the Fresh- 

 water Algae of the West Indies," in which several new species were 

 described and beautifully illustrated. Mr. G. Murray, in criticising this 

 paper, testified to the extreme care and accuracy with which the species 

 had been worked out. 



Feb. 16th. — Prof. Stewart, President, in the chair. 



Mr. Linnasus Greening was elected, and Mr. Albert Smith was admitted 

 a Fellow of the Society. 



Mr. W. B. Hemsley exhibited some germinating seeds of Lemna and 

 some flowering plants of Lemna gibba, upon which, in his absence, some 

 remarks were made by Mr. C. H. Wright. From the observations made, 

 it was inferred that although Lemna minor and L. gibba are usually regarded 

 as distinct, they are respectively the male and female plant of one species. 



On behalf of the Director of the Royal Gardens, Kew, Mr. C. H. Wright 

 exhibited and made some remarks upon a collection of native plants from 

 the neighbourhood of Cape Town, which had been presented to the Her- 

 barium by Miss Yorke, and which was remarkable for the skilful way in 

 which the natural colours of the plants had been preserved. 



On behalf of the Rev. J. G. Tuck, of Tostock Rectory, Bury St. Edmunds, 

 there was exhibited a hybrid between the Common House Sparrow and the 

 Tree Sparrow, Passer montanus, which had been taken near Bury on the 

 Jan. 13th last. Only one instance of a similar wild hybrid was said to 

 have been previously captured, although two or three instances were on 

 record of the two species interbreeding in aviaries. 



Mr. J. C. Willis gave an abstract of a paper on the Natural History of 

 the Flower (Part II.), in which he dealt with the mode of fertilization 

 in Brodicea ixioides, S. Watson ; Stanhopea tigrina, Bateman ; Pimelea 

 decussata, R. Br., var. diosmcefolia, Cotyledon umbilicus, L. ; Hydrolcea 

 spinosa, L. ; Ziziphora capitata, and made some remarks on cleistogamy 

 in Salvia verbenaca, L. A discussion followed, in which Dr. D. H. Scott, 

 Prof. Reynolds Green, and Mr. A. B. Rendle took part. 



The Secretary read a paper, by Miss D* F. Pertz, "On Hygroscopic 

 movements connected with seed-dispersal," in which the author partially 

 reviewed the literature of the subject, and detailed the method of observation 

 adopted by previous workers and by herself. 



