4 STALK- AND SESSILE-EYED CRUSTACEA 
margin truncate, and somewhat produced at its antero-external angle. 
Anterior legs long, considerably enlarged in the adult male. Ambu- 
latory legs long, with the penultimate joint more or less dilated, 
expanded and compressed. Abdomen of g seven, of 9 five, six-joimted. 
Tt. ehnedrack . f 
2. Halimus hectori. PI. I, fig. 1. ; 
‘Halimus hectori, Miers, Ann. Mag. Nat. Hist. (ser. 4) xvii, p. 219, 
(1876). 
Carapace moderately convex, broadest behind, with the sides 
converging from the front of the branchial regions, obscurely tubercu- 
lated ; there are four low tubercles, (two median and two lateral), on 
the gastric, two in front of the branchial region, one at some distance 
behind upon the surface, and two smaller on the sides. The upper 
orbital margin projects considerably over the base of the eyes. There 
are four obtuse spines, of which two larger, on the hepatic, and about 
ten smaller tubercles on the pterygostomian regions; cardiac region 
convex. ‘The spines of the rostrum are straight, and scarcely at all 
divergent. Anterior legs wanting. Penultimate joint of the ambulatory 
legs considerably dilated, and square-truncate at its distal extremity. 
Abdomen of 2 * six-jointed, the two last joints coalescent. Length 
rather more than 2 in.; breadth nearly 14 in. 
New Zealand (Coll. Brit. Mus.). 
This species is in many respects intermediate between Acanthonyx 
and /falimus, the two genera indeed are separated by structural 
peculiarities of but little importance; the spines of the rostrum are not 
divergent, and the basal joint of the external antenne is rather narrow 
as in Acanthonyx, but in the convergent sides of the carapace and the 
form of the penultimate joints of the legs it resembles Halimus. 
As this latter genus inhabits the Southern Seas and the species of 
Acanthonyx the Northern temperate zone, I refer the species to Halimus. 
It is distinguished from other species of the genus by the absence of 
spines upon the carapace and sides of the branchial regions. A single, 
(unfortunately mutilated) specimen, was brought to England and _pre- 
sented to the British Museum by Dr. Hecror, F.R.S. 
PARAMITHRAX. 
Paramithrax, M. Edw. Hist. Nat. Crust. i, p. 328, (1834); Dana, 
U.S. Explor. Exped. xiii, Crust. part i, p. 79, (1852). 

* By a printer’s error “male” in Ann, Mag. Nat. Hist. Z.c. 
