106 Transactions.—Zoology. 
It occurs in Dunedin Harbour, in rock pools along the beach from Otago 
Heads to Taieri Mouth ; and I have specimens from Paterson Inlet. 
Genus Zaus, Goodsir. 
Body broad and depressed; head distinct from cephalothorax ; rostrum 
broad and truncate. Anterior antenns 9-jointed ; posterior 2-jointed, with 
remarkable comb-like spines at the apex, inner branch slender, 2-jointed. 
Mandible small, palp slender, 2-branched, second foot-jaws strongly clawed. 
First pair of feet 2-branched ; outer branch indistinctly 3-jointed, the median 
joint very short; inner branch 2-jointed, short, last joint rudimentary. 
Ovisac large, single. 
1. Zaus contractus, n. sp. Pl. X., figs. 1-7. 
Body oblong, not much narrowed posteriorly.. Cephalothorax nearly 
halfas long as body, rounded in front; rostrum short, blunt. Abdomen 
less than one-fourth as long as body, broader than long. Anterior antenn# 
short, tapering gradually ; joints having the following relative lengths :— 
: l4 8 ee 56 7 8 9 
L o u 314. 8 3. 4. 2. 2. 3. 
Posterior antennæ 2-jointed; first joint broad, bearing internally a 2- 
jointed appendage and a single seta externally; second joint elongated and 
furnished with two or three curved sete, and two curved plate-like organs 
pectinated on their outer margin; (one of the sets, which is jointed near 
its apex, appears to act as an opposable clasping organ). Mandibles small, 
bearing a 2-branched palp. Maxille very small. Anterior foot-jaws small, 
normally formed ; posterior with an ovate or somewhat pyriform hand anda . 
strongly curved claw, which impinges against a deep groove in the palm of - 
the hand. First pair of feet with the outer branch elongated, apparently 
only two-jointed (from the coalescence of two of the joints ?); first joint 
pectinately setose on its outer margin, terminating in a single seta; second 
joint ending in four curved blunt claws, furnished with comb-like teeth : 
inner branch little more than half as long as outer, 2-jointed ; first joint 
pectinate-spinose on the outer margin; second joint very small, bearing à 
strong eurved claw, minutely toothed on its inner margin. Three following 
pairs of feet 2-branched, each branch 8-jointed, rather slender; outer 
branches strongly spined on the outer margin and apex, spines furnished 
with pectinated plates or flanges on their outer (upper) margins. Fifth 
pair with each branch 1-jointed, inner branch rounded and bearing four 
marginal (terminal) setze, outer rather longer, and also furnished with four 
sete. Posterior abdominal segments shortly spined at their postero-lateral 
margins; caudal segments nearly square ; caudal sete short. 
Length 4 of an inch. 
Hab. Dredged in Otago Harbour ; 5 fathoms. 
