of the Family Halacaridae. 191 



slender, cylindrical, with feeble, non-pectinate claws. Cuirass 

 sculptured like the skin of a Crocodile, especially on the base 

 of the rostrum. Total length 0*75 millira. (rostrum alone 

 0-30 millim.). 



Hab. Le Croisic (Chevreux), Roches de Castouillet, by 

 dredging with swabs. 



Genus Leptognathus, Hodge, 1860. 



Leptognathus, Hodge (2) ; Lohmann (8), p. 86. 



Char. Rostrum very long, compressed, constricted at the 

 base. Palpi articulated upon the dorsal surface of the ros- 

 trum, along the median line, forming, with the elongated 

 pointed hypostome, a forceps, of which the movable branches 

 (palpi) move vertically ; the second joints of the palpi touching 

 each other throughout their length in repose. Claw of the 

 mandible recurved. Epistome very short, apparently replaced 

 by the base of the maxillary palpi. Three species of this 

 genus have been described. 



1. Leptognathus falcatus. 



Leptognathus falcatus, Hodge (2). 



Rhaphignathus falcatus, Brady (3), p. 307, pi. xlii. figs. 7-10. 



Leptognathus falcatus, Lohmann (8), p. 89. 



Char. Epistome extending as far as the base of the palpi, 

 between which it projects in the form of a small button. 

 Anus projecting in a bulb-like form. Plates of the cuirass 

 smooth. Total length 0*90 millim. 



Hob. French coast: Fas-de-Calais, Wimereux (O iard), on 

 Lasa>a rubra and Corallina officinalis. English coast {Hodge, 

 Brady) : Laminarian and Coralline zones, Northumberland 

 and Scilly Islands. 



2. Leptognathus marinus. 

 Lohmann (8), p. 88, figs. 121, 122. 



Char. Differs from the preceding species chiefly by it3 

 small size. Total length 0*60 millim. 



Hab. French coast : Le Croisic (Chevreux), Grande Cote, 

 on Corallina officinalis. Baltic: Kiel (Lohmann), upon red 

 and green Algse, at 12 fathoms. 



3. Leptognathus violaceus. 



Kramer, Arch. f. Naturg. 1879. 



Char. This species appears to differ from the preceding 

 only by its pitted cuirass. Total length 0*88 millim. 

 Hab. Pools of Thuringia, upon Alga? (Kramer). 



