1 12 Transaction*. — Zoology. 



This genus is nearly allied to Artotrogus, but differs completely in the 

 structure of all the swimming feet. 



1. Conostoma elliptica, n. sp. PI. V., figs. 9-14. 



Body broadly elliptical, rounded in front, width more than two-thirds of 

 the length ; first segment short, hardly separated from the second, except 

 by a slight lateral constriction, the two together form a broad cephalo- 

 thoracic carapace which is more than two-thirds as long as the whole body ; 

 two last thoracic segments much curved inwards posteriorly ; abdomen 

 greatly abbreviated, only two segments being apparent. Anterior antennas 

 rather short ; eighth joint the longest, and furnished at its extremity with 

 a long (auditory?) seta ; posterior antennas feeble, bearing one or two ter- 

 minal setae. Mouth siphon slightly ciliated at its extremity. Anterior 

 foot-jaws with the basal joint broad, and apparently furnished with a 

 hollow groove on its inner margin to receive the subequal second joint 

 which is curved and sharply pointed at its apex: posterior pair 4-jointed, 

 second joint large, third very short, last ending in a sharp claw, and 

 furnished with two sharp teeth on its inner margin. Swimming legs 

 furnished with numerous rather short plumose setae. Caudal seg- 

 ments rather broader than long, terminated by 4 plumose setae, the 

 longest being about one-fourth the length of the body. Length, -£% of 

 an inch. 



Hab. Only one specimen of this peculiar form was obtained by the 

 dredge in Otago Harbour. 



In the figure, two coiled organs are shown near the posterior end of the 

 body ; these have been rather prominently brought out by Mr. Buchanan ; 

 they are probably cement-glands. 



Genus Artotrogus, Boeck. 



Body broad, suborbicular or pyriform ; cephalothorax broadly ovate ; 

 abdomen of four segments, first and second of which are coalescent in the 

 female. Anterior antennas 9-20-jointed, shorter than the cephalothorax ; 

 posterior 4-jointed, with a strong apical claw, without an appendage or with 

 only a very small one. Mouth produced into a siphon which reaches to 

 about the hinder margin of the first body-segment. Mandibles elongated, 

 filiform, without a palp. Maxillas 2-branched, setiferous at their apex. 

 Footjaws simple, bearing a strong apical claw on each ; first pair 2-jointed; 

 second 4-jointed. First four pairs of feet 2-branched, each branch 3- 

 jointed ; fifth pair rudimentary, 1 -jointed. 



"Animals living in the branchial sacs of simple Ascidians or on the 

 integument of various marine Invertebrata" (Brady). 



All my specimens have been obtained by the dredge, apparently swim- 

 ming freely, or crawling on kelp or on Sertularians. 



