190 Transactions. —Z oology. 
DESCRIPTION OF PLATE XXII. 
Fig.l. Cymodocea cordiforaminalis, from above x 13. 
la. 3 
» inner antenna x 30. 
1b. és is outer antenna x 30. . 
le. A A first thoracic leg x 30. 
1d. : nc abdomen from below x 24. 
= 
Art. XVI.—On two Marine Mites. ` By Cuartes Cumton, M.A. 
[Read before the Philosophical Institute of Canterbury, 6th April, 1882.] 
Plate XXIIs. 
Amone some Crustacea collected from Lyttelton Harbour I have found two 
specimens of mites, belonging to two different species. 
According to Semper,* sea-mites are “ by no means rare." Gosse has 
described three English species, one belonging to the genus Pachygnathus 
(Dugès) and the other two to the genus Halacarus, specially made for 
them. As my specimens appear to resemble these two latter sufficiently 
to be placed in the same genus, I have ventured to describe them. 
Genus Halacarus, Gosse. 
(Annals & Magazine of Natural History, ser. 2, vol. xvi., p. 27.) 
“ Body covered above with a well-defined shield, either entire or trans- 
versely suleated ; under surface divided across the middle; rostrum head- 
like consisting of a bulbous tip, tapering to a point, divided longitudinally 
beneath, allowing the protrusion of a pair of slender filiform mandibles ; 
palpi terminated by a fang-like unguis; feet cursorious, tipped with two 
faleate ungues; directed two forward and two backward, thighs remote. 
Marine." 
Halacarus parvus, sp. nov. Pl. XXIIs., fig. 1. 
Body oval, narrower in front than behind ; notched at the bases of the 
legs, a slight transverse depression between the bases of the third pair of 
legs, anterior margin between the bases of the first pair of legs convex. 
First two pairs of legs arising close together, third and fourth more remote 
from one another. Legs subequal, third and fourth very slightly longer 
than the first and second and with fewer sete ; all with the first two joints 
short, third long and somewhat expanded, fourth short about as broad as 
long, fifth about as long as the third, last joint about two-thirds as long as 
the fifüh, bearing two very movable curved hooks, each of which has two 
teeth at the end, the main one being larger and more curved than the 
* Animal Life (Inter. Nat. Sc. Series, vol. xxxi.), p. 438. 
