214 ARACHNOIDEA. 



CASE the cepnalothorax and abdomen. These, however, only serve 



XllI 



the purpose of an artificial arrangement, and we have disregarded 

 them in our attempt at a more natural classification ; but for the 

 benefit of those who wish a litdehelp in making them out without 

 referring to Nicolet, we here give the heads of his arrangement :— 



1st Section. — Tarsi with three claws. 



Subsect. I. — Cephalothorax with lamellar appendages. 



A. With lateral wing-formed movable expansions to the abdomen, 



and with heterodactyl tarsi, that is, with the middle claw 

 larger than the two others. 



a. Hairs on the vertex, spatula-shaped, i. Pelops. 



h. Ditto, ditto, bristle-shaped. 2. Oribata. 



B. Without lateral wing-shaped expansions. 



a. Tarsi homodactyl, i.e. claws alike. 



a. Tectum attached to the cephalothorax only by its 



base. 3. Cepheus. 

 13. Tectum confounded with the cephalothorax. 

 4. Notaspis. 

 b. Tarsi heterodactyl. 5. Leiosoma. 

 Subsect. 2. — Cephalothorax without lamellar appendages. 



A. Legs slender, with flexible hairs and fusiform joints, terminated 



by a heterodactyl tarsus. 6. Eremceus. 



B. Legs thick, with rigid hairs, and subcylindric joints, terminated 



by a homodactyl tarsus. 7- Nothrus. 

 2nd Section. — Tarsi one-clawed. 



Subsect. I. — Cephalothorax with salient apophyses, or nervures (ribs). 



A. Legs longer than the body. 8. DavicBus. 



B. Legs shorter than the body. 9. Tegeocraims. 

 Subsect. 2. — Cephalothorax, without apophyses. 



A. Cephalothorax, soldered to the abdomen, and immovable. 10. 



Hermamiia. 



B. Ditto, articulated on the abdomen, and movable. 11. Hoplophora. 



Although few of the species of the family of Oribatidae have been 

 recorded as found in England, we have figured and noted the chief 

 genera, believing that if they are properly sought for, the species 

 commonest in France will also be found in Britain. Species of at 

 least four of the genera have been met with in Spitzbergen, so the 

 coldness of the climate should be no obstacle to their living here. 



