REMARKS ON THE NATURAL ARRANGEMENT OF TIIE MYRIAPODA. 



241 



M. Gcrvais (Aptercs, vol. iv), divides the Chilognatha into five families, — the Polyxe- 

 NiDiR, Glomeridce, Polydesmiidve, ItJLID^E, and PoLYZONIIDJE. Of these, the Polyxenidce 

 and Polydesmidce are the same as the same-named families of Gray, whilst the Glomeridce 

 comprise the Glomeridce and Zephroniidce of that author, and the Midce his lulidce and 

 Graspcdesom idee. 



The Polyzoniidce are the Sugentia of Brandt. Thus : 



GRAY. GeRVATS. 



Polyxcnidae Polyxenidso. 



Glomeridae. 1 



Zephroniida,. / " ' ' • Glomendte. 



Polydesmidas Polydesmidie. 



Iulid;«. | 



Craspedesomidffi. / Iulidse - 



None Polyzoniidte. 



M. Brandt (Eecueil, p. 3(5), composes his "Tkibus TI" (Chilognatha) of all the Diplo- 

 poda, except the Sugentia. This tribe he divides into three families,— Monotonia, Tri- 

 zonia, PentAZONIA. The first of these comprises the Polyxenidce and Polydesmidce of 

 Gray; the second, the lulidce and Graspedesomidce ; the third, the Glomeridce and Zeph- 

 roniidce of that author. The Sugentia he divides into two sections, the Ommatopiiora and 

 TyphlogbnA, which arc respectively the Polyzoniidce and Siphonophoridce of Newport. 



Mr. Newport (Linn. Trans., vol. xix), divides all the Chilognatha (including the Su- 

 gentia) into six families, — Glomeruli.;, Polyxenid/e, Polydesmidce, Iulwm, Polyzoniid/E, 

 Siphonophoridje. Of these, the Glomeridce includes the Glomeridce and Zephroniidce of 

 Gray; the Polydesmidce the Polydesmidce and perhaps the Graspedesomidce* of the same 

 author ; the Polyxenidai and Midce correspond to his families of the same name, whilst the 

 Siphonophoridce and Polyzoniidce are the Sugentia of Brandt. Mr. Newport then associates 

 these six families in three groups, which he calls tribes : 1st. " Pentazonia, Brandt," com- 

 prising the Glomeridce. 2d. " Monozonia, Brandt" comprising the Polyxenidce and Poly- 

 desmidce. 3. " BlZONIA, Newport" comprising the lulidce, Polyzoniidce, and Siphonophoridce. 



* It is almost impossible to make out the exact limit of tlio Graspodesomidae of Gray : it may be that Mr. New- 

 port divides the group intended to be characterized by Mr. Gray, and puts only a part of it into his Polydcsinidse 

 and the rest into his Iulida). 

 VOL. XIII— 81 



