12 Oribata 



2 longitudinal rows of hook-shaped hairs on 



Dors, of Abd. and a bordering row; 



Psstg. org. with short peduncle and 



. almost globular head. L. 440 |n . . 34. O. halleri p. 21 



4 longitudinal rows of ordinary hairs on Dors. 



of Abd. and a bordering row, Psstg. org. 



with long peduncle and recurved fusiform 



head. L. 450 ILI 38. O. peloptoides p. 22 



Dors, of Abd. bearing hairs 41. 



Dors, of Abd. hairless 43. 



Ptm. joined anteriorly by a chitinous 



bridge; a crescentic indentation in 

 , 1 j centre of post, margin, C. lam. hori- 

 zontal, truncated. L. 500 |l .... 45. O. rileyi p. 24 



Ptm. not joined; no indentation of post. 



margin; C. lam. vertical, pointed 42. 

 Dors, of Abd. with an irregular network 



of ridges ; hairs on Dors, of Abd. long, 



stiff, serrated, on post, margin clavate. 



42 < - L. 500 n 42. O. mirabilis . . . . . . p. 23 



Dors, of Abd. smooth; hairs on the same 



short and simple, on post, margin 



setifonn. L. 420 ILI 44. O. parmeliae p. 23 



Psstg. org. short sessile, fusiform, directed 



43 { horizontally forward. L. 300 |u . . . 41. O. fusigera p. 23 



Psstg. org. long, recurved 44. 



Psstg. org. pectinated along distal part of 



44 \ ant. (outer) edge. L. 390 (LI . . . . 43. O. monodactyla . . . . p. 23 



Psstg. org. not pectinated. L. 600 |ui . . 40. O. dentata p. 23 



Div. I. Sp. 1-39. Uug. trid. 

 Subdiv. la. Sp. 119. Having a Trlam. 



1. O. antarctica Michael 1895 0. a., Michael in: Mt. Mus. Hamburg, v. 12 

 p. 71 textf. 



Im. Very like 0. gracilis but not identical, smooth, not quite so slender 

 as 0. gracilis nor legs quite so long. Lam. blades, much wider anteriorly 

 than posteriorly. C. lam. very long, standing quite free. Rost. hairs, 

 Lam. hair and Intlam. hair serrated. Psstg. org. with very short 

 peduncle and small, almost globular head. Legs of medium length, femora 

 of legs 3 and 4 with blades. Ung. trid. Tectp. 1 with long free points. 

 Ant. margin of Abd. convex in centre concave at sides. A few very fine 

 hairs on Dors, of Abd. L. ca. 700 fi. 



South Georgia (Antarctic Ocean). 



2. O. clypeata Nic. 1855 0. c., Nicolet in : Arch. Mus. Paris, c. 7 p. 437 t. 5 f. 7. 



Im. Black, highly polished, legs brown. Lam. blades on edge, slightly 

 undulated; C. lam. very long. Trlam. a mere line strongly concave 

 forward. Tectp. 1 forming long free point anteriorly, bearing a hair. 

 Psstg. org. setiform, long. Abd. hairless broadest in centre, narrowed ante- 

 riorly and posteriorly but much more suddenly posteriorly; hind margin 

 truncated and much narrower than ant. margin of Abd., which is sinuated, 

 convex forward in centre, concave posteriorly. Ung. trid. L. 1.13 mm. 



Under stones. France. 



