of the Family Halacaridge. 185 



dibles stout, terminated by a straight nail in the form of a 

 serrated knife-blade. Spine of anterior feet not pennate. 

 Epistomial plate much developed, with three impressions 

 sculptured in relief, one on each side and one in front. 

 Total length 0*50 millim. 



Hah. Atlantic coast of France : Marennes (Charente- 

 Inferieure), upon oysters (Trouessart). 



14. Halacarus Lohmanni, sp. n. 



Char. Like the preceding, especially II. Fahricii. Anterior 

 legs stouter and shorter than the posterior, with the margins of 

 the joints angular beneath ; tarsus with a well-developed 

 ungueal groove. Total length 0*40 millim. 



This species is dedicated to Dr. H. Lohmann, author of the 

 monograph of the Halacaridae of the Baltic. 



Hab. Shores of New Zealand ; upon Algae sent to the 

 Paris Museum (Hariot). 



GliOUP C. — Rostrum with the base wide and constricted; the 

 hypostome short, forming with the rostrum a reversed 

 heart ; cuirass complete, the strongly sculptured plates 

 only leaving between them a linear space. Last joint of 

 the palpi slender, elongate, styliform. 



15. Halacarus rhodostigma. 

 Gosse (1), p. 27, pi. iii. figs. 1-5 ; Lohmann (8), p. 83. 



Char. Claws of the feet destitute of lateral teeth and 

 ciliated combs. Tarsi with no ungueal groove. Cuirass com- 

 plete, covered with points in rosette not forming more salient 

 ■patterns or longitudinal streaks. Second joint of the anterior 

 legs inflated. Total length - 35-O40 millim. 



Hab. French coast : Arcaehon, Marennes {Trouessart), upon 

 oysters (common). English coasts : North Sea (Northum- 

 berland), Channel (Weymouth, Gosse)', littoral zone of Lami- 

 nariaj and Corallines. 



16. Halacarus gracilipes, sp. n. 



Char. Claws destitute of lateral teeth and of combs as in the 

 preceding species. No ungueal groove on the tarsus. Cuirass 

 complete, with a sculpture forming projections and longitu- 

 dinal lilies, finer upon the epistomial and notogastric plates. 

 Second joint of the anterior limbs not more inflated than that 



