184 Dr. E. L. Trouessart — Synoptical Revision 



front. All the claws pectinate, those of first pair like the 

 others; a well-developed ungueal groove on the tarsi. Man- 

 dibles slender, with a feeble claw. A well-developed noto- 

 gastric plate. In other respects like the preceding species. 

 Total length 0-70 millim. 



This species is dedicated to M. Hariot, the botanist attached 

 to the " Mission du Cap Horn," who collected it at the same 

 time as the Algse of that region. 



Bab. Shores of Saddle Island, Cape Horn (Hariot), upon 

 A lga3 ( Codium fragile) . 



Subgroup 3. — Form of the rostrum and palpi as in the pre- 

 ceding subgroup, but the third joint of the palpi without 

 the internal spine. Plates of the cuirass greatly de- 

 veloped and strongly sculptured as in the following 

 subgroup. Sculpture of the notogastric plate forming 

 longitudinal lines. Epistomial plate cut square in 

 front, leaving the rostrum exposed. 



11. Halacarus Fabricii. 

 Lohmann (8), p. 79, figs. 81, 82. 



Char. Ocular plates wide, furnished with a very visible 

 cornea. Median spine of the penultimate joint of the first 

 and second pairs of legs finely pennate and furnished with a 

 tubercle at the base. Epistomial plate rounded in front. All 

 the claws pectinate ; tarsus with a slightly developed ungueal 

 groove. Anus terminal. Total length 0'52 millim. 



Hob. French coast: Arcachon (Trouessart), on oysters; 

 shores of the Mediterranean (Trouessart), on Corsican moss. 

 Baltic: Kiel (Lohmann), on fixed and floating Green Algae 

 and on Red Algge (at 12 fathoms). 



12. Halacarus loricatus. 

 Lohmann (8), p. 81. 



Char. Ocular plates wide, with the cornea apparent. 

 Spine of the 'penultimate joint not pennate and without a 

 tubercle at the base. Otherwise like the preceding species. 

 Total length 0'40 millim. 



Hob. Baltic : Kiel (Lohmann), upon Red Alga3 at 12 

 fathoms. 



13. Halacarus glyptoderma. 

 Copidognathus glyptoderma, Trouessart (7), p. 754. 



Char. Like the preceding species, but the hypostome square, 

 truncated, wider and shorter than that of H. loricatus. Man- 



