of the Family Halacaridse. 18S 



weeds on the Floridese, sponges, and Flustrce, at a depth 

 of about 12 fathoms. 



3. Halacarus levipes. 

 Trouessart (10), Le Naturalists, p. 162. 



Char. Very similar to the preceding species, but differing 

 from it in the presence of spinous hairs, mixed with the long 

 slender hairs, upon the anterior legs. Hypostome less com- 

 pressed, elongate triangular. It is perhaps only a southern 

 variety of//. Murrayi. Total length 0"50 millim. 



Hob. Shores of the Mediterranean. A single individual 

 found upon Corsican moss (Gigartina helminthocorton). 



Group B. — Rostrum triangularly conical, with the apex 

 directed forward ; hypostome shorter than the basal part 

 of the rostrum, with no constriction at its base. Last 

 joint of palpi conical, more or less pointed, but not 

 styliform. Genital aperture in the form of an oval frame, 

 differing but little in the two sexes. 



Subgroup 1. — Body compressed, abdomen elongated as in the 

 preceding group, flanks parallel to the level of the inser- 

 tion of the legs. 



4. Halacarus jloridearum. 

 Lohmami (8), p. 72, figs. Ill, 115. 



Char. Anus terminal ; third joint of palpi furnished on its 

 inner margin with a thick, non-setiform spine. Ocular plates 

 toith no cornea ; third joint of first pair of legs bearing only 

 three hairs planted in a triangle upon the most inflated part. 

 Claws ciliated. Dermal plates pitted except the sternal plates. 

 Total length 0-45-0-50 millim. 



Hab. Baltic, Kiel {Lohmann), region of Red Seaweeds, on 

 Floridea3, at depths of 3-12 fathoms. 



5. Halacarus balticus. 

 Lohmann (8), p. 73, figs. 103, 120. 



Char. Anus terminal ; third joint of palpi furnished with a 

 strong spine upon its inner margin ; third joint of first pair of 

 legs having two dorsal seta? behind the triangle formed by the 

 three hairs inserted about the middle. Ocular plates with a 

 large cornea. Epistomial plate with a nearly straight ante- 

 rior margin. Claws not ciliated. Tarsi with a slightly deve- 



