50 Limuean Society. 



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 adopt. The following is a synoptic table of 

 the genera of the whole class : — 



Class MYRIAPODA, Leach. 



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

 menta inaequalia ; singula par unicum pedum ad segmentorum latera 

 insertorum gerentia. Mandibulae prominentes, acutae, falciformes. Or- 

 ganorum sexualium apertura ad extremitatem analem. 



Trib. 1. Schizotausia, Brandt. — Antennae pluri-articulatae, graciles, 

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

 compositi, prominentes, globosi. 



Fam. ]. Cermatiidce, Leach. — Scuta dorsalia 8; singula segmenta 

 2 ventralia obtegentia. Stigmata median a. 



Gen. 1. Cermatia, Illig. — Oculi prominentes. Caput trans- 

 versum. Scuta dorsalia emarginata. Stomatum latera in- 

 crassata. 



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

 2 mobilibus efformatum. Antennae corpore haud longiores, setaceae 

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

 simplices vel nulli. 



Fam. 2. Lithobiidce, N.ewp. — Scuta dorsalia 15, subquadrata, in- 

 aequalia ; angulis elongatis, acutis. Coxae posteriores excava- 

 tionibus ovatis. 



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



depressum. Labrum denticulatum. 

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

 ocellorum pari unico. 



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

 Pedes posteriores incrassati; articulo primo vel secundo spinoso. 



Gen. 4. Scolopendra, L. — Segmentum cephalicum cordatum, 

 imbricaturn. Ocellorum paria 4. Spiraculorum valvularium 

 paria 9. 



Gen. 5. Cormocephalus, Newp. — Segmentum cephalicum 

 posticfc truncatum. Spiracula valvularia. 



Gen. 6. Rhombocephalus, Newp. — Segmentum cephalicum 

 basilareque rhomboidea. Labium angustatum. 



Gen. 7. Heterostoma, Newp. — Segmentum cephalicum trun- 

 catum. Dentesmagni. Spiracula cribriformia, in paribus 10. 



Gen. 8. Scolopendropsis, Brandt. — Segmentum cephalicum 

 truncatum. Pedum paria 23. 



Gen. 9. Theatops, Newp. — Ocelli distincti. Antennae 17- 



