Historical Notes. 11 



Lastly I have to mention the splendid work of the Rev. Thomas 

 R. R. Stebbing, 39, on the »Challenger» Amphipoda, published at the end of 

 kst year, in the bibliographical part of which the accomplished author 

 gives us many valuable hints concerning the synonymy of the Oxyce- 

 phalidean genera and species, and in the second half of the descrip- 

 tive part of wich he most accurately sets forth the characteristics of the 

 species obtained during the celebrated »Challenger» Expedition. The 

 descriptions are accompanied by magnificent plates. He describes the 

 following genera and species, Oxycephalus Clausi, G. Bovallius, 

 Oxyccphalufi porcellns^ Claus, 0. lonqiceps^ Claus, the last two below- 

 being named Streetsia porcellus, Claus, and S. longiceps, Claus; 

 Leptocotis ambobus^ n. sp., sj-nonymous with Dorycephalus Lindströmi, 

 C. Bovallius, as will be proved below; Leptocotis mindanaonis, n. 

 sp.; Calamorhynchus rigidus, n. sp.; Streetsia n. g., with the new 

 species S. c hallen geri; Rhabdosoma armatum^ H. Milne Edwards, of 

 whicli he with some doubt quotes Rh. Whitei as a synonym, and lastly 

 the new species Rh. brevicaudatum. The name Simorhi/nchiis, Claus, is 

 changed into Simorhynchotus, u. n., and he places this genus in the 

 famil}' Lycœidœ. 



In this treatise I propose to distinguish the OxycephalidEe, 

 Spence Bate and the Xiphocephalidae as two separate families, and 

 my reasons for doing so will be given below; T further think it necessary 

 to transfer the genus Simorhynchotus, Stebbing, from the 2Vy/;/ice?i2y« 

 to the Oxycephalidaä, in order to get uniformity in the generic cha- 

 racters; in this latter family I remove Oxycephalus porcellus, Claus, O. 

 pronoides, C. Bovallius, O. longiceps, Claus, and O. Steentrupi, C. Bo- 

 vallius, from the genus Oxycephalus, seusu stricto, to Stebbing's new 

 genus Streetsia; for the reception of 0. typhoides.^ Claus, O. sclero- 

 ticus., Streets, and a new species with the specific name Théeli, I pro- 

 pose the new genus Stebbingella. For Leptocotis Lindströmi the new 

 genus Dorycephalus is instituted. A hitherto undescribed Oxycephalid 

 is the type for the new genus Cranocephalus, with the specific 

 name C. GoËsi. The names Rhabdosoma, Adams and White, and Rhab- 

 donectes, C. Bovallius, are dropped in favour of the generic name Xi- 

 phocephalus, proposed by Guérin as early as in 1841 to this genus 

 a new species X. Lilljeborgi is added. 



