760 



Lub or Hermit Islands, north of the Admiralty Group, and 3. A Ray from 

 Sorry Island, North-west of the Admiralties, which is placed in a new genus 

 of the Trygonidœ, and named Discobatis marginipinnis. — 6) Fourth Adden- 

 dum to the Monograph of the Australian Hydromedusae. By R. v. Len- 

 denfeld, Ph.D. In this paper a new species of Hydra is described, which 

 possesses invariably six arms, and on them cells, which the author considers 

 more nearly allied to the Palpocils of Sarsia (Schulze), than the ganglia cells 

 of Hydra. — 7) Professor Selenka's Researches into the development of 

 the American Opossum. By R. v. Lendenfeld, Ph.D. Prof. E. Selen- 

 ka's most important discoveries regarding the concupiscence, and the com- 

 mencement of the development of the embryo of this marsupial, are enume- 

 rated in this short preliminary report. — 8) Second note on Macrodontism. 

 By N. de Miklouho-Maclay. The author states his opinion about the 

 very large teeth which he has observed in natives of diflferent Islands of Me- 

 lanesia. The results of observations during his last two trips (1879 and 

 1882) to the Admiralty and Lub Islands is the conclusion that the enlarge- 

 ment of the teeth is nothing but an excessive accumulation of a special kind of 

 tartar deposited on the incisors and canines of the iipper and lower jaw. — 

 Mr. Brazier exhibited a specimen of Paryphanta Hochstetteri, a shell which 

 he had exhibited at the August meeting, showing the remarkable effect pro- 

 duced by the heat a few days ago. The shell was completely splintered into 

 about 50 pieces, nothing remaining but the whorls and the umbilicus. He 

 said that he had often observed Bulimi throwing off the epidermis from heat, 

 but had never before seen an instance of a shell flying to pieces from that 

 cause. ■ — Mr. O gii by exhibited a specimen mounted by Mr. Whitelegge 

 for the microscope, of Branchiostoma cassanum, Günther, dredged off North 

 Head. — Mr. Palmer exhibited a species of Coccinella, which had in a few 

 days cleared his peach trees of an attack of Aphides, which threatened their 

 destruction. Also specimens of Anoplognathus inusttis in the cocoon , but 

 completely formed, and a beautiful chrysalis, probably of a Danois, suspen- 

 ded from a fern leaf. — Mr. Palmer also exhibited two Mogos or Stone 

 Axes of a very rough description, found a little below the surface in a ca- 

 vity of the sandstone on the Blue Mountains. — Mr. C. S. Wilkinson 

 exhibited a small fish brought by Mr. H. T. "Wilkinson, J. P., from 

 Lord Howe Island ; also from the same Island a fine specimen of Dolium 

 variegatum which Mr. Brazier stated had not hitherto been found so far to 

 the east of Australia, Mr. Macleay and Mr. Ogilby considered the fish to be 

 a new genus, and Mr. Macleay undertook to examine and describe it. 



IV. Personal -Notizen. 



Dor pat, Prof. M. Braun unternimmt in diesen Tagen mit mehreren 

 seiner Schüler eine wissenschaftliche Reise an das Mittelländische Meer. 



München. Dr. H. Schauin sland, früher Assistent am zoologischen 

 Institut in Königsberg ist als Assistent am zoologischen Institut in München 

 angestellt worden und hat sich an dortiger Universität als Privatdocent ha- 

 bilitirt. 



Druck von Breitkopf & Härtel in Leipzig. 



