1844.] Linnean Society. 195 



Fam. 8. lulidae, Leach. — Coi-pus cylindricum ; laminis lateralibus 

 nulJis. Segmenta e subsegmentis 2 coalitis efFormata. 



Subfam. 1. SynpodopetalitKE, Newp. Pedes laminis immobi- 

 libus affixi. 



Gen. 26. Platops, Newp, — Caput parvum, complanatum 

 vel concavum. Pedes graciles, elongati. Corpus pyia- 

 midale, elongatum. 



Gen. 27. lulus, L. — Caput convexuni. Corpus cylindri- 

 cum. Prothoracis latera triangularia. Antenna^ elon- 

 gatse. 



Gen. 28. Unciger, Brandt. — Squama inferior analis mu- 

 cronata. Corpus cylindricum 



Gen. 29. Spirobolus, Brandt. — Caput convexum. Oculi 

 subtetragoni. Corpus subpyramidale. Prothoracis la- 

 tera triangularia. Antennae breves. 



Gen. 30. Spiropoeus, Brandt. 



Gen. 31. Spirocyclistus, Brandt. — Antennae breves. Oculi 

 elongati, triangulares. Thoracis latera brevia, triangu- 

 laria. 



Gen. 32. Spirostreptus, Brandt. — Antenna breves, arti- 

 culis infundibulatis. Oculi transversi. Prothoracis la- 

 tera elongata vel dilatata. 



Subfam. 2. Lysiopetalina, Newp. Pedes laminis mobilibus 

 affixi. 



Gen. 33. Lysiopetalum, Brandt. — Frons dilatata. Pedes 

 laminis liberis mobilibus affixi. 



Fam. 9. Polyzonidce, Newp. (Ommatophora, Brandt). — Ocelli 

 conspicui, fronti inter antennas in seriebus transversis inserti. 



Gen. 34. Polyzonium, Brandt. — Ocelli 6parvi, in seriebus 

 2 transversis. Corpus depressum. 



Gen. 35. Siphonotus, Brandt. — Ocelli 2, in serie simplici 

 transversa. 



Fam. 10. Siphonophoridce, Newp. (Typhlogena, Brandt.) — Oculi 

 nulli. 



Gen. 36. Siphonophora, Brandt. — Caput conicum, elonga- 

 tum. Nutritionis organa rostriformia, elongata. 



The author then proceeds to treat at considerable length of the 

 external anatomy of the Myriapoda, commencing with the composi- 

 tion and mode of development of the segments and their appendages, 

 and comparing them in these particulars with Insects. The variations 



