176 Dr. E. L. Trouessart — Synoptical Revision 



tarsus hooked in all the feet. Coxae of the first pair united 

 into a single ventral plate. Claws with a simple comb. Ocular 

 plates having only a single cornea. Total length 0"37 millira. 

 Hah. Atlantic coasts : France, Le Croisic, Pen-bronn 

 and Port-lin (Chevreux) , upon Corallines, brown Algae, and 

 stranded Algae. Very common everywhere ; the most widely 

 distributed species of the coast of Le Croisic. Shores of the 

 North Sea; England, Seaham Harbour, littoral zone. Shores 

 of the Baltic, Kiel (Lohmann), region of Red Seaweeds. 



3. Rhombognathus setosus. 

 Aletes setostis, Loliru. (8), p. 58, figs. 79, 80. 



Char. Claws recurved like sickles ; additional joint of the 

 tarsi with no hook ; anterior margin of the epistomial plate in 

 the form of a hood entirely concealing the rostrum. Coxae of 

 first pair well separated, forming a narrow chitinous band on 

 each side. Ocular plates with the cornea simple. Total 

 length 0"32 millim. 



Hah. Shores of the Baltic, Kiel (Lohmann) ; sandy shores. 



4. Rhombognathus nigrescens. 



Pachygnathus nigrescens, Brady (4), p. 26, pi. iv. figs. 4, 5. 

 Aletes nigrescens, Lolim. (8), p. 60. 



Char. Claws angularly recurved and furnished with a double 

 comb, without lateral teeth ; additional joint of tarsi furnished 

 with a hook on all (?) the feet. Ocular plate with the cornea 

 simple. Size very large, double that of the other species. 

 Total length 072 millim. 



Hah. A single specimen found in England by Brady in a 

 pool of fresh water on the rocks (Northumberland) . 



5. Rhombognathus notops. 



Pachygnathus notops, Gosse (1), p. 305, pi. viii. figs. 1-4. 

 Aletes notops, Lohm. (8), p. 62, figs. 89, 94. 



Char. Claws recurved like sickles, with a lateral tooth, but 

 without a comb ; additional joint of tarsi without a hook ; 

 epistomial plate leaving the rostrum exposed; ocular plates 

 furnished with a double cornea. A plumose hair on the tarsi 

 of the first pair of feet. Total length 0*35 millim. 



Hab. Shores of the Ocean. France : Le Croisic, Pen- 

 bronn {Chevreux), on Corallines (Corallina officinalis) and 

 green Algae, pretty common. British coasts : Shetland 



