I 



CLASS III. ARACIINOIDA. 



M7 



** Anfentice witfi elongate juints. 

 Sp. 4. Geoph. lotigicornis. Body yellow: head ferruginous: antennoslong. 

 Geophilus longicornis. Leach, Trans. Linn. Soc. xi. 380. — Supp. to En- 



cycl. Brit. i. 481./)/. I'l. — Zool. Mhc. iii. tub. 140. f. 3-G. 

 Inhabits the earth and under stones. 



Obs. — Scolopcndra electrica of Linnc belongs to this genus. 



k 



Class III. A RJ C II NO IDA. 

 Arachnoida. Fischer. 

 Arachnides. Lamarck, Latreille, Leach. 



~ From apcc^vi], a spider, and stSo;, resejnblance. A class of anhnals 

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

 celebrated Lamarck, and established as such by Latreille, Cuvier, and 

 Leach. 



Linne arranged all of these animals with which he was acquainted 

 with apterous insects, under the generic titles, Piiaf.angium, Araxea, 

 AcAUOs, and .Scorpio; and hi this disposition he was followed by Cu- 

 vier. 



Lamarck, in his Sj/stanr dex Anlmnur sans Vcrtehres, has included 

 amongst the Arachnoida the Myriapoda, and certain animals which in 

 the system proj)osed by Dr. Leach form a distinct cider of insects, 

 which will be mentioned hereafter. 



Dumcril, in his Zoologie Anulijtiquc, has placed the Aimchnoida with 

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

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

 family: 2. Aranea; 3. Mygale; 4. Piirynus; S.Scorpio; 6. Che- 

 lifer; 7. Galeodes; 8. Piialangium. 



Lamarck, in his Extrait du Cours, S)-c. has placed the Arachnoida with 

 some genuine insects and ]\Ii/riaj>oda ; but he has formed for them a 

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

 into the following little groups of Genera. 



I. PYCNOGONIDES. 



Genus 1. Nympiium: 2. Phoxiciiilds: 3. Pycnogonum. 



II. ACARIDES. 

 * Parasitic. 

 a. Six legs. 

 Genus 4. Astoma: .5. Left us: G. Carts. 



1). Eight legs. 

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



