70 THE ZOOLOGIST. 



Lieut.-Col. H. H. Godwin-Austen read a paper on the land-shells 

 collected in Borneo by Mr. A. Everett, Mr. Whitehead, and others. In 

 this communication (the second of the series) the author gave a list of the 

 species of the families Zonitidce and Helicidce, as known, from Borneo up 

 to the present time. He described the anatomy of several species and 

 defined two new genera (Diakia and Everettia), pointing out how they differ 

 from previously known genera founded on anatomical characters. 



Jan. 20.— W. T. Blanfoed, Esq., F.R.S., F.Z.S., in the chair. 



Mr. Sclater exhibited specimens of three species of Purple Waterhens 

 (Porphyrio poliocephalus, P. caruleus, and P. smaragdonotus), of the 

 Eastern PalaBarctic Region, and made remarks on their nomenclature and 

 geographical distribution. 



Mr. F. E . Beddard described a new African earthworm of the genus Siphon- 

 ogaster from specimens transmitted by Sir A. Moloney, from the Yoruba 

 country to the north of Lagos, and proposed to call it Siphonog aster millsoni. 



Mr. Oswald H. Latter read some notes on the Freshwater Mussels of 

 the genera Anodon and Unio, describing the passage of the ova from the 

 ovary to the external gills, the mode of attachment of the glochidia to the 

 parent's gill-plate, and some other peculiarities. 



A communication was read from Mr. Roland Trimen, containing an 

 account of a series of Butterflies collected in Tropical South-western Africa 

 by Mr. A. W. Eriksson. The collection contained examples of 125 species, 

 of which eleven appeared to be new to science. 



A communication was read from Mr. H. H. Brindley, containing an 

 account of a specimen of the White Bream, Abramis blicca, in which the 

 pelvic fins were entirely absent. 



Mr. Boulenger read notes on the osteology of the poisonous Lizards, 

 Heloderma horridum and H. suspectum, pointing out the differences between 

 the two species. He also remarked on the systematic position of the 

 Helodermatidce, which he held to be between the Anguidai and Varanidce, 

 but nearer the former ; any close relationship with the Mosasauridce was 

 demurred to. It was incidentally mentioned that the Eocene genus 

 Thinosaurus, Marsh, was probably a member of the family Teiida, and 

 that the Cretaceous Hydrosaurus lesinensis was a Dolichosaurus. The 

 Dolichosauria were considered as the probable common ancestors of the 

 Lacertilia, Pythonor?iorpha, and Ophidia. 



Prof. C. Stewart gave an account ol some points in the anatomy of 

 Heloderma horridum and H. suspectum, differing in some respects from the 

 descriptions of these Lizards given previously by Drs. Fischer and Shufeldt. 

 The most interesting and important point was concerning the poison- 

 apparatus. He believed that he had shown that in both species the ducts 

 of the gland did not enter the lower jaw, but passed directly t^ openings 



