of the Family Halacaridae. 177 



Islands, Ilfracombe (Gfosse), littoral zone. Baltic, Kiel (Loh- 

 mann)j region of Red Seaweeds. 



6. Rhombognathus magnirostris. 

 Trouessart (10), Le Naturaliste, August 1889, p. 181. 



Char. Like R. notops, but larger and stouter ; additional 

 joint of the feet much elongated, not hooked. Rostrum large 

 and broad. Epistome cut off squarely at the level of the 

 base of the palpi. Legs with long and slender seta3. Two 

 plumose hairs well developed on the third joint of the four 

 pairs offset. Comb of the accessory tooth of the claws broad 

 and strong. Total length 0'45 millim. 



Hob. Shores of the Mediterranean, upon the Corsican 

 Moss (Gigartina helminthocorton) and the Corallines and Red 

 Seaweeds collected in the same localities and confounded 

 under that name. 



R. magnirostris , var. plumifer, var. nov. 



Differs from the type by the presence of a third feebly 

 plumose hair on the third joint of all the legs. The other two 

 strongly plumose. Total length 0*38 millim. 



Hah. Shores of Tierra del Fuego : Saddle Island (Cape 

 Horn), upon Seaweeds (Codium fragile, Ceramium Dozii), 

 collected by M. Hariot (Mission du Cap Horn). 



7. Rhombognathus minutus. 



Paehygnatlms minutus, Hodge (2), 1860. 

 Aletes minutus, Lohm. (8), p. 65. 



Char. Claws falciform, pectinated, with a lateral tooth ; 

 additional joint of tarsus hooked. Ocular plates with a double 

 cornea. Size small? (species imperfectly known). Total 

 length 0-28 millim. 



Hah. English coast : Seaham, Northumberland {Hodge) ; 

 littoral zone. 



Genus Simognathus, Trt., 1889. 



Trouessart (9), p. 1179, & (10), p. 162. 

 Pachygnathus, pt., Brady (3), p. 306. 



Char. Rostrum short and broad, with maxillary palpi 

 touching each other above, applied to one another in the median 



