112 Transactions.— Zoology. 
This genus is nearly allied to Artotrogus, but differs completely in the 
structure of all the swimming feet. 
1. Conostoma elliptica, n. sp. Pl. 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 antenne 
rather short; eighth joint the longest, and furnished at its extremity with 
a long (auditory ?) seta; posterior antenne feeble, bearing one or two ter- 
minal sete. 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 sete. Caudal seg- 
ments rather broader than long, terminated by 4 plumose sete, the 
longest being about one-fourth the length of the body. c gs 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 Mons out by Mr. Buchanan; 
they are probably cement-glands. 
Genus Artotrogus, Boeck. 
Body broad, suborbieular or pyriform; cephalothorax broadly ovate ; 
abdomen of four segments, first and second of which are coalescent in the 
female. Anterior antenne 9-90-jointed, shorter than the cephalothorax ; 
posterior 4-jcinted, 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. Maxille 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. 
