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 antennaa 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. PI. X., figs. 1-7. 



Body oblong, not much narrowed posteriorly. Cephalothorax nearly 



half as long as body, rounded in front ; rostrum short, blunt. Abdomen 



less than one-fourth as long as body, broader than long. Anterior antennae 



short, tapering gradually ; joints having the following relative lengths : — 



1, 2, 3, 4, 5, 6, 7, 8, 9, 



10. 14. 14. 8. 3. 4. 2. 2. 3. 



Posterior antennae 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 setae, and two curved plate-like organs 

 pectinated on their outer margin ; (one of the setae, which is jointed near 

 its apex, appears to act as an opposable clasping organ). Mandibles small, 

 bearing a 2-branched palp. Maxillae very small. Anterior foot-jaws small, 

 normally formed ; posterior with an ovate or somewhat pyriform hand and a 

 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 httle more than half as long as outer, 2-jointed; first joint 

 pectinate-spiuose on the outer margin ; second joint very small, bearing a 

 strong curved claw, minutely toothed on its inner margin. Three following 

 pairs of feet 2-branched, each branch 3-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) setae, outer rather longer, and also furnished with four 

 setae. Posterior abdominal segments shortly spined at their postero-lateral 

 margins ; caudal segments nearly square ; caudal setae short. 



Length -^ of an inch. 



Hob. Dredged in Otago Harbour ; 5 fathoms. 



