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 

 last 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 Clan si, C. BOVALLIUS, 

 Oxycephalus porcellus, GLAUS, 0. lonyiceps, GLAUS, the last two below 

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

 Leptocotis ambobus, n. sp., synonymous with Dorycephalus Lindstro mi, 

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

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

 species S. challenge ri; Rhabdosoma armatum, H. MILNE EDWARDS, of 

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

 the new species Rh. brevicaudatum. The name Simorhynchus, GLAUS, is 

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

 family Lycceidce. 



In this treatise I propose to distinguish the Oxycephalidse, 

 SPENCE BATE and the Xiphocephalidse as two separate families, and 

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

 to transfer the genus Simorhynchotus, STEBBING, from the Tryphcenidce 

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

 racters; in this latter family I remove Oxycephalus porcellus, GLAUS, 0. 

 pronoides, C. BOVALLIUS, 0. longiceps, GLAUS, and 0. Steentrupi, C. BO- 

 VALLIUS, from the genus Oxycephalus, sensu stricto, to STEBBING/S new 

 genus Streetsia; for the reception of 0. typhoides, GLAUS, 0. sclero- 

 ticus, STREETS, and a new species with the specific name The"eli, I pro- 

 pose the new genus Stebbingella. For Leptocotis Lindstromi the new 

 genus Dorycephalus is instituted. A hitherto undescribed Oxycephalid 

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

 name C. GOESI. The names Rhabdosoma, ADAMS and WHITE, and Rhab- 

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

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

 a new species X. Lilljeborgi is added. 



