104 



Notes on South Australian Decapod Crustacea. 



PART IV. 



By W. H. Bakek. 



[Read June 5, 1906.] 



Plates I. to III. 



The following notes refer to seven species. The llrst 

 three are members of the Oxyrhyncha or Maioid crabs. Two 

 of these were dredged by Dr. Verco in 104 fathoms off the 

 Neptune Islands. One of these two I have referred to the 

 genus Evrynome : the other is a species of Stenorhynchus : 

 the third I take to be a strong variety of Paratymolus lairpe^, 

 Haswell, and comes from much shallower water. 



Two allied species belong to genera quite remote from 

 the foregoing: Elamena truncata, StimjDSon ?, and llymeno- 

 soma roiitratum, Haswell, do not seem to have been figured 

 heretofore. 



Litorheira r/lahra, n. sp., seems to be as rare as its near 

 relation, L. bispinosa, Kinahan, is common on our coast. 

 These two are the only representatives of the genus kno^vn 

 to me in the Australian fauna. 



The rare genus, Trichia, is represented by a unique 

 species, which I must be content solely to describe, as its 

 affinities are unknown to me Miss Rathbun (see Proc. 

 Biolog. Soc, Washington, No. xi., p. 166) has proposed the 

 name Zalasius for Trichia, but for certain reasons I have 

 retained the old one. 



The types have been placed in the Adelaide Museum. 



I must mention my indebtedness to Mr. F. E. Grant, of 

 Sydney, who has been good enough to read the paper and 

 offer some criticisms, and supply some information. 



OXYRHYNCHA. 



Family Inachid.e. 



Sub-family Leptopodiin.e. 



Genus Sfenoi-hj/nrlnis, Lamarck. 



Stenorhynchus ramusculus, n. sp. 



PI. i., Hgs. 1. la. 



The body is thick. 



The carapace is sub-triangular, moderately smooth, 

 longer than broad, strongly convex, especially on the gastric 

 region ; the branchial regions also are full. There is a median 

 gastric and a cardiac spine, which project upwards, and a 

 small curved spine on each metabranchial region. 



