192 Linnean Society. [April 16, 



the head of the Invertehrata, and (following in the steps of our di- 

 stinguished countrymen Kirby and Spence^ to commence with the 

 Hexajjods or true Insects, placing after these the Octopods or Arach- 

 nida, and the Decapods or Crustacea, to be followed by the Myria- 

 poda, the Annelida, and the remainder of the Articulata. 



The more important objections to this mode of arrangement are 

 considered and answered ; and the author next proceeds to examine 

 the division of the Myriapoda into tribes and genera, on which sub- 

 ject he agrees, to a considerable extent, with Professor Brandt, 

 whose plan he has followed closely in the formation of the families, 

 sections and genera, and in the characters assigned to them, but 

 whose division of the class into masticating and sucking Myriapoda 

 he has been unable to adoj)t. 'i'he following is a synoptic table of 

 the genera of the whole class : — 



Class MYRIAPODA, Leach. 

 Ord. 1. CHILOPODA, Latr. — Caput latum, prominens. Corporis seg- 

 menta inseqnalia ; singula par uiiicum pedum ad segmentorum latera 

 insertorum gerentia. Maiidibulse pvominentes, acutce, falciformes. Or- 

 ganorum sexualium apertura ad extremitatem analem. 



Trib. 1. ScHizoTARsiA, Brandt. — Antennas pluri-articulatae, graciles, 

 corpore longiores. Tarsi longi, pluri-articulati, inaequales. Oculi 

 compositi, pvominentes, globosi. 



Fam. 1 , CermatiidcB, Leach. — Scuta dorsalia 8 ; singida segmeuta 

 2 ventralia obtegentia. Stigmata mediana. 



Gen. 1. Cermatia, IlUg. — Oculi pvominentes. Caput trans- 

 versum. Scuta dorsalia emarginata. Stomatum latera in- 

 crassata. 



Trih. 2. Holotarsia, Brandt. — Tarsi 3-articulati. Caput e segmentis 

 2 mobilibus efFovmatum. Antennae corpore baud longiores, setaceas 

 vel filiformes, 14 — 60-articulatEe. Oculi stemmatosi, aggregati, 

 simplices vel nulli. 



Fam. 2. Litkoblidce, Newp. — Scuta dorsalia 15, subquadrata, in- 

 aequalia ; angulis elongatis, acutis. Coxaa posteriores excava- 

 tionibus ovatis. 



Gen. 2. Lithobius, Leach. — Ocelli numerosi. Caput latum, 

 depressuni. Labrum denticulatum. 



Gen. 3. Heiucops, Newp. — Segmentum cephalicum latum; 

 ocellorum pari unico. 



Fam. 3. Scolopendrldce, Leach. — Segmenta podophora 21 vel 23. 

 Pedes posteriores incrassati; articulo primo vel secundo spinoso. 



