Chilton. — On Marine Mites. 191 



accessory one ; proximal part of the concave edge of the main tooth and 

 the concave edge of the secondary tooth, pectinated. The last joint of the 

 leg has two or three long setae on its outer edge and many short ones at the 

 base of the two hooks ; a portion of the end appears to be hollowed out so 

 as to form a resting-place for the hooks when they are bent back upon the 

 joint. A few setaa are scattered over all the joints of the legs. 



Palpi of six joints ; basal one rather large, partly concealed when seen 

 from above by the anterior margin of the shield of the body, second and 

 third joints short, about as broad as long, fourth very long, slightly ex- 

 panding distally, fifth joint small, about twice as long as broad, sixth 

 slightly longer than the fifth, tapering at the end and bearing a few short 

 setaa. Each palp is directed inwards so that the two meet and the distal 

 half of the inner margins of the fourth joints are in contact. Below can be 

 seen the rostrum, which is long and slender, reaching almost to the end of 

 the palpi. Anus terminal. Vulva enclosed in a circular space a little 

 anterior to the anus. 



No eyes visible. Colour, light brown. 

 Size of body, excluding rostrum, about ^ of an inch. 

 Hab. Taken between high- and low-water marks, Lyttelton Harbour. 

 Halacarus truncipes, sp. nov. PL XXIIb., fig. 2. 



Body elliptical, deeply notched at the bases of the third and fourth pairs 

 of legs, less so at the bases of the first and second pairs, a notch on each 

 side just behind the second pair of legs, slightly produced in front so as to 

 form a rounded lobe between the first pair of legs. Eyes three, one median, 

 very small a little behind the anterior margin of the head ; the other two 

 forming a pair, one on each side just behind the second pair of legs and 

 near the marginal notch already mentioned, each of the paired eyes en- 

 closed within a circular mark. Body-shield with a transverse depression 

 midway between the bases of the third and fourth pairs of legs. This does 

 not extend right across the body, but is met on each side by a slight longi- 

 tudinal depression extending anteriorly and outwards as far as the bases of 

 the third pair of legs. Behind the transverse depression are two longi- 

 tudinal ones extending right to the end of the body, the enclosed median 

 portion is raised above the lateral parts, especially on each side next the 

 depression, thus forming two slight ridges which meet behind. Anus on 

 the under side of the animal a little anterior to the end of the body, vulva 

 enclosed in a circular space a little anterior to the anus. 



Body divided below by a transverse depression midway between the bases 

 of the third and fourth pairs of legs, this depression met on each side by a 

 longitudinal depression ; these two longitudinal depressions extend back- 

 wards and converge, meeting just behind the anus, 



