.Appendix. Taken on the BevonsVre coast by Dr Leach. 

 — * "V*"'' Stirps 2. Apex of ti tail with two bifid styles ; 

 antennae setaceous. 



* Styles very minute, sec y c< ly exserted ; anterior feet 

 like the others ; without a head. 



Genus XII. J^era. Eyes of the middle size insert- 

 ed betwixt the sides of the bead and the vertex. 



Sp. 1. Albifrons. Head anteriorly whitish. 



Oniscus albifrons, Montagu's MSS. 



Jara albifrons. Leach, Men?. Wern. Soc. vol. ii. 



Inhabits the British sea every where, under stones 

 and amongst fuci. 



** Styles of the tail exser.°d ; anterior feet larger 

 than the others, with a moveable thumb. 



Genus XIII. Janira. Nails bifid; eyes of a mode- 

 rate size, inserted on the sides of the head towards the 

 vertex. 



Sp. 1. Maculosa. Light cinereous, mottled with 

 brownish speckles. 



Oniscus maculosa, Montagu's MSS. 



Janira maculosa. Leach, Mem. Wern. So ■'. vol. ii. 



Inhabits the Devonshire coasts, under stones, but is rare. 



Genus XIV. Asellus. Nails simple; eyes minute 

 and lateral. 



Sp. 1. Aquaticus, see p. 404. 



Tribe VIII. ONISCIDES. 

 Internal antennae very minute, scarcely discernible. 



Family I. Ligid.e. 

 Caudal styles two on each side, sitting on a common 

 peduncle in hairs. 



Genus XV. Ligia, see Genus LXXI. 

 Sp.l. Oceanicus. Ligia scopulorum is merely a va- 

 riety of this species, see p. 406, as we have found every 

 intermediate variety in size and sculpture. 

 Family II. OnisciDjE. 



Caudal styles two on each side, the lateral one two- 

 jointed. 



Stirps 1. Body not contractile into a globe. 

 * External antennae with eight joints. 



Genus XVI. Philoscia, see Genus LXXII. 



Genus XVII. Oniscus, see Genus LXXIII. 

 ** External antennae with seven joints. 



Genus XVIII. Porcellio, see Genus LXXIV. 



Stirps 2. Body contractile into a globe. 



Genus XIX. Armadillo, see Genus LXXV. 



This genus intimately connects the Orders Tetra- 

 cera with the Duocera. 



Class MYMAPODA. 

 Order I. CHILOGNATHA. 

 Includes Fam. 20. Julides of this article, 

 and 407. 



Family I. GlomeriDjE. 

 Body contractable into a ball. 



Genus XX. Glomeris. Feet on each side sixteen. 

 Seep. 407. 



Genus XXI. Cryxus. Feet on each side twenty. 

 See p. 407. 



Family II. Julid.e. 

 Body not contractable into a ball. 

 Stirps 1 . Antenna; inserted on the superior margin 

 of the head. 



* Eyes distinct and granulated. 

 Genus XXII. Julus. See Gen. p. 407. 

 Genus XXIII. Craspedosoma. See Gen. Julus ** 

 p. 407. 



** Eyes obsolete. 



CRUSTACEOLOGY. 



Genus XXIV. Polydesmus. See Gen. LXXVIII. Append;*. 

 Stirps 2. Antennae inserted under the anterior mar- ""*"" V"*" 

 gin of the head. 



Genus XXV. Polyxenus. See Gen. LXXIX. 

 Order II. SYNGNATHA. 

 Family I. Scutigerid^e. 

 Segments of the body bearing four feet. 

 Genus XXVI. Scutigera. See Gen. LXXX. 



Family II. ScolopendridjE. 

 Segments of the body with a single pair of feet. 

 Stirps 1. Last pair of feet remarkably larger than the 

 rest. 



* Feet thirty. 

 Genus XXVII. Lithobius. See Gen. LXXXIII. 



** Feet forty. 

 Genus XXVIII. Scolopendra. See Gen. LXXXI. 

 Genus XXIX. Cryptops. See Gen. LXXXII. 

 Stirps 2. Last pair of feet not very much larger than 

 the rest. 



Genus XXX. Geophilus. See Gen. LXXXIV. 



Class ARACHNIDES. 



Those of this class having but six feet, may be ar- 

 ranged in a more perfect manner : we can add one new 

 genus, and the genus Nycteribia of Latreille is also re- 

 ferable to this division, although he has placed it with 

 the insect6. 



Hexapoda. * 

 Tribe I. Cephalostoma. 

 Mouth situated in the head. 



Family I. PhjEnorhynchi. 

 Mouth porrected and easily to be seen. 

 Genus I. Caris. See Gen. I V. 

 Genus II. Leptvs. See Gen. V. 

 Genus III. Ocypete. Mouth rostriform, porrected 

 betwixt the palpi. 



Palpi elongate- conic, incurved, the last joint acute, 

 corneous, and nail- like, abruptly narrower than the 

 preceding, underneath at the base with a conic (soft?) 

 elongate moveable appendage. Body soft, oval, smooth, 

 the upper part anteriorly, as if divided into two parts 

 by a transverse line ; the anterior division a little nar- 

 rower, and bearing the mouth, eyes, and four anterior 

 feet. Two eyes on each side close to one another, pro- 

 minent, (or placed on a peduncle?), inserted above 

 the base of tire anterior feet. Feet six-jointed, the last 

 joint of the anterior pair thickest. 



Between the eyes, which are inserted longitudinally, 

 there is a black spot above the base of the rostrum. 



This genus seems akin to the Trombidia in the parts 

 of the mouth at least. 



Sp. 1. Rubra. Body red, back with a few long, and 

 the feet with many short rufous hairs, inclining to ash- 

 colour. Eyes blackish brown. 



Dr Leach took no less than sixteen specimens of 

 this interesting little parasite, from one tipularous in- 

 sect in Devon. 



Family II. Aph^norhynchi. 

 Mouth hidden. 

 Genus IV. Astoma. See Gen. VI. of this article. 



Tribe II. Notostoma. 

 Mouth placed on the back. 



Genus V. Nycteribia. Latreille, Montagu, Lin-. 

 Trans, vol. xi. 

 Pthiridium. Hermann. 

 Celeripes. Montagu, Lin. Trans, vok jx. 

 Sp. 1. Vespsrtilionis. 



p. 387 



