CLASS III. ARACIINOIDA. 



117 



** Antenna with elongate joints. 

 Sp.4.Geoph.lougicomis. Body yellow: head ferruginous : antenncelons^. 

 Geophilus longicornis. Leach, Trans. Linn. Soc. xi. 386. — Supp. to En- 



cycl. Brit. i. 481./)/. 22.— 2bo/. Misc. iii. tab. 140. /. 3-6. 

 Inhabits the earth and under stones. 

 Obs. — Scolopendra elecfrica of Linne belongs to this genus. 



Class III. ARAC IINOlDA. 

 Arachnoida. Fischer. 

 Arachnides. Lamarck, Latreille, Leach. 



From apx^vrj, a spider, and eiSos, resemblance. A class of animals 

 formerly arranged with Insects, but first shown to be distinct by the 

 celebrated Lamarck, and established as such l)y Latreille, Cuvier, and 

 Leach. 



Linnc arranged all of these animals with which he was acquainted 

 with apterous insects, under the generic titles, Piiat.angium, Aranea, 

 AcARUs, and Scorpio; and in this disposition he was followed by Cu- 

 vier. 



Lamarck, in his Sj/stcme des Animaux sans Vcrtlbres, has included 

 amongst tlie Arachnoida the Myriapoda, and certain animals which in 

 the system proposed by Dr. Leach form a distinct order of insects, 

 which will be mentioned hereafter. 



Dumeril, in his Zoologie Anali/tiqne, has placed the Arachnoida with 

 the apterous insects. He arranges the genus: 1. Ixodes Lutr. with 

 Pediculus and Pulex; the other genera he has placed in a peculiar 

 family: 2. Araxea; 3. Mygale; 4. Phryxis; S.Scorpio; 6. Che- 

 lifer; 7. Galeodes; 8. Phalaxgil-m. 



Lamarck, in his Extrait dii Cours, S^c. has placed the Arachnoida with 

 some genuine insects and JMyriapoda ; but he has formed for them a 

 separate Order, which he terms Arachnides palpati, and disposes them 

 into the following little groups of Genera. 



I. PYCNOGOXIDES. 



Genus 1. Nymphum: 2. Phoxichilus: 3. Pycnogoxlm. 

 11. ACARIDES. 

 * Parasitic. 

 a. Six legs. 

 Genus 4. Astoma: .5. Leptus: 6. Caris. 



b. Eight legs. 

 Genus 7. Uropoba : 8. Argas: 9. Ixodes: 10. Acarus. 



