292 "TERRA NOVA" EXPEDITION. 



The only adult male among the specimens submitted to me is defective as regards 

 the fourth pleopods, so I am unable to indicate the exact nature of the armature of the 

 exopod. 



The species is characterised by the acute spine at the antero-lateral corners of 

 the carapace, the proportions of the antennal scale and its length relative to the 

 antennular peduncle, and the short form of the telson. 



Distribution. — Kaikorai lagoon (brackish water) estuary of the Waikouaita River, 

 rock pools at Brighton, both localities near Dunedin (Thomson) ; Lake Waikare 

 (Chilton, 1906) ; mouth of a little stream near Brighton, in water almost fresh to the 

 taste though close to the sea, and affected by extra high tides (Chilton, 1906). All 

 these records indicate that this species is an estuarine form, capable of living in almost 

 fresh water and having, in fact, a habitat very similar to that of Neomysis integer in 

 British Avaters. 



The specimens recorded by Thomson from the Bay of Islands, 8 fms., which, through 

 the courtesy of Professor Benham, I have been allowed to examine, do not belong to 

 this species but to T. similis, one of the neAv species described below. 



14. Tenagomysis chiltoni, sp. nov. (Plate 11, figs. 5-8.) 



Occurrence. — Tidal inlet, Parakai, 19-12-18, abundant (C. Chilton). The specimens 

 sent to me are three females, 8-10 mm. 



Not collected by the " Terra Nova." 



Description. — Carapace larger than in most of the other species of the genus, 

 leaving only the last thoracic somite exposed. Antero-lateral angles of the carapace 

 produced into acute spines. Frontal plate short, obtuse and bluntly pointed, the 

 proximal portion of the antero-lateral margin sloping away much more abruptly than 

 the distal portion, so that the antero-lateral angles of the carapace are displaced rather 

 far back. The whole appearance in dorsal view can best be judged from tlie figure 

 accompanying this description. 



Eyes of normal appearance, about twice as long as broad, the cornea occupying 

 the distal half. 



Antennal scale very long, extending beyond the antennular peduncle for at least 

 half its length, ten times as long as broad, narrowly lanceolate in shape, setose all 

 round, distal joint distinct, spine on the outer distal corner of the jomt from which 

 the scale arises very prominent. 



There is a prominent acute spine on the body of the mandible immediately outside 

 the attachment of the palp. I have not noticed this feature in any of the other species. 



The thoracic limbs are, on the whole, short and robust, the anterior ones more so 

 than the posterior. The tarsal joint in all is composed of four short joints, in addition 

 to which the nail is distinct and robust. The outer distal corner of the basal joint of 

 the exopod is acute. 



Sixth abdominal somite more than twice as long as the fifth. 



