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1890. — Mr. S eia ter exhibited some sketches made by Lieut. W. E. Stairs, 

 R.E., of the Horns of a large Antelope, apparently new to science, which 

 had been met with by the Emin-Pasha Relief Expedition in the forest-district 

 of the Aruwimi River. — Mr. G. A. Boulenger, F.Z.S., read the descrip- 

 tion of a new Lizard of the genus Ctenoblepharis obtained in the Province of 

 Tarapacà, Chili, by Mr. A. A. Lane, which he proposed to describe as Cteno- 

 blepharis Jamesi. — A second paper by Mr. Boulenger contained an account 

 of some specimens of extinct and fossil Chelonians preserved in the Museum 

 of the Royal College of Surgeons. — Mr. F. E. Beddard gave an account 

 of certain portions of the anatomy of the Kagu [RJiinochetus jubatus) as ob- 

 served in specimens lately living in the Society's Gardens. — Lieut. -Col. 

 H. H. Godwin-Austen, F.R.S., read a paper on the Land-Shells col- 

 lected 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 Zonitidae and Helicidae as known from Borneo up to the 

 present time. He described the anatomy of several species and defined two 

 new genera [Diakia and Everetlia) , pointing out how they differ from pre- 

 viously known genera founded on anatomical characters. — P. L. Sclater, 

 Secretary. 



20th January, 1891. — Mr. Sclater exhibited specimens of three spe- 

 cies of Purple Waterhens (Porphyrio poliocephalus, P. coeruleus, and P. sma- 

 ragdonotus), of the Eastern Palaearctic Region, and made remarks on their 

 nomenclature and geographical distribution. — Mr. F. E. Beddard, F.Z.S., 

 described a new African Earthworm of the genus Siphonogaster from speci- 

 mens transmitted by Sir A. Molony, K.C.M.G., from the Yoruba country 

 to the north of Lagos, and proposed to call it Siphonogaster 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, F.R.S., containing an account of a series of Butterflies 

 collected in Tropical South-western Africa by Mr. A. W. Eriksson. The col- 

 lection contained examples of 125 species, of which 11 appeared to be new 

 to science. — A communication was read from Mr. H. H. Brindley con- 

 taining 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 re- 

 marked on the systematic position of the Helodermatidae, which he held to 

 be between the Anguidae and Varanidae, but nearer the former ; any close 

 relationship with the Mosasauridae was demurred to. It was incidentally 

 mentioned that the Eocene genus Thinosaurus, Marsh, was probably a member 

 of the family Teiidae, and that the Cretaceous Hydrosaurus lesinensis was a 

 Dolichosaurus. The Dolichosauria were considered as the probable common 

 ancestors of the Lacertilia, Pythonomorpha, and Ophidia. — Prof. C. Stew- 

 art gave an account of 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 



