SYSTEMATICAL NOTES. 



19 



CCC 2. The head is more or less produc- 

 ed forming a rostrum. The maxillae 

 are rudimentary. 



CCCC 3. The telson is coalesced with 

 the last ural segment. The 

 seventh pair of perseopoda are 



complete, not transformed. 15. OXYCEPHALID^:. 

 CCCC 4. The telson is free l ), not co- 

 alesced with the last ural 

 segment. The seventh pair 



of perseopoda are transformed. 16. XIPHOCEPHALHXE. 

 C 2. The femur of the sixth pair of perasopoda is more 



or less operculiform. 



CC 3. The seventh pair of perseopoda are complete, 

 not transformed. The mouth-organs are 



narrow, protruding. 17. PARASCEUD^E. 



CC 4. The seventh pair of perseopoda are reduced. 



The mouth-organs are short and broad. 18. EUTYPHID^E. 



name Trypfusnidee ought to be applied to the family thus composed, but as it has been used as a sy- 

 nonym for LycfEidee by myself and by STEBBING it would make confusion in the synonymy. I therefore 

 prefer to use a family-name derived from the new form given by STEBBING to the old generic name 

 Phorcus, which was found to be preoccupied. To maintain, as does STEBBING. the family-name Phorcida, 

 when the generic name Phorcus is rejected, is not convenient as the family-name must refer to a generic 

 name in use within the family. 



I have also divided the old family Tryphcenidce into two, Euthamneidte comprising the 

 two genera Thamyris, SPENCK BATE, (or Brachyscelus, according to STEBBING) and Euthamneus, (the 

 former name Thamnem being thus modified to avoid confusion) and Lycceida, CLAUS, restricting 

 it to the two genera Lyccea, DANA, and Pseudolyccea, CLADS. Of the old members of the family Try- 

 plicenidai, as it was composed in my paper, which i have just referred to, I have thus placed Tryphcena 

 in the family Phorcoraphidce; Paratyceea in the Pronoidce, (this transposition was really done in 1887 

 but owing to a typographical error it stands into Systematical listt> with its number from Pronoida 

 among the Tryphcenidce) ; Thamyris and Euthamneus in the new family Euthamneidce ; Lycoea and Pseu- 

 dolyccea in the Lycceidce; and lastly Simorhynchotus in the Oxycephalidce. 



1) A very puzzling exception to this rule is Ehabdosoma brevicaudatum, described by STEBBING 

 (1. c. p 1612, pi. 208). He says namely that the telson is coalesced with the last ural segment and 

 much shorter than this segment, broadly rounded and pectinate at the apex, but all these statements 

 are strikingly opposed to my experience which is founded upon the examination of many specimens of the 

 two old species, Xiphocephalus armatus and X. Whitei. I for my part am much inclined to 

 believe that the single specimen which was the type for the new species proposed by STEBBING, may 

 have been abnormal, perhaps injured. 



