MYSID ACE A— TATTERS ALL. 291 



(u) Rostral plate not longer than one third of the first antennular joint, apex obtuse. 



(a) A small species ; antenual scale seven times as long as broad ; tarsus of the 



thoracic limbs composed of four joints ; telson with 16-18 spines on its margins. 



T. scotti, sp. nov. 



(&) A large slender species ; antennal scale eleven times as long as broad ; tarsus 



of the thoracic limbs composed of nine to fourteen joints ; telson with 36 



spines on its margins. T. temdpes, W. M. T. 



13. Tenagomysis novae-zealandiae, Thomson. 



T. novae-zealandiae, Thomson, 1900, p. 484, pi. 33, figs. 6-8, pi. 34, figs. 9-17 ; Hutton, 1904, 

 p. 256 ; Chilton, 1906 ; Thomson, 1913 ; Thomson, 1921, p. 108. 



Occurrence. -~^ot taken by the " Terra Nova," but specimens from Brighton 

 (labelled types) and Waikouaiti River (coll. C. Chilton) were kindly sent me by Pro- 

 fessor W. B. Benham, F.E.S. 



Description.— Cuv^Tp&ce hardly at all produced to form a rostral plate, anterior 

 margm between the eyes evenly rounded, antero-lateral angles produced into an acute 

 spine. 



Eyes not more than twice as long as broad, cornea hemispherical, occupying almost 

 half the eye in dorsal view. 



Antennal scale nearly twice as long as the antennular peduncle, five times as 

 long as broad, lanceolate in shape, setose all round, terminal joint distinct, a prominent 

 spine on the basal joint from which the scale springs. 



Antennal peduncle extending to the level of the distal joint of the antennular 

 peduncle. 



Tarsal joint of the third to the eighth thoracic limbs composed of three joints, 

 in addition to the terminal dactylus. 



Telson shorter than the sixth abdominal somite, and about half as long as the outer 

 uropod, cleft for about one-fifth of its length, cleft armed with a pair of plumose setae, 

 and twenty-two to twenty-four teeth on each side, lateral margins of the telson armed 

 with from twelve to fifteen short stout spines extending throughout their entire length. 



Inner uropod one and a half times as long as the telson, lower inner margin with 

 a row of spines about twenty in number, extending from the statocyst to about one- 

 quarter of the length of the uropod from the apex, the proximal spines closely set, the 

 distal ones more distantly separated. 



Outer uropod one-third longer than the inner. 



Length of an adult female, 8 mm. 



Remarks. — The above particulars have been taken from the specimens labelled 

 " types," from Brighton, near Dunedin. The length of the largest specimen is, however, 

 only 8 mm., whereas Thomson gives the length of adult females as from 10-16 mm. 

 A slight error may here be noticed in Thomson's description of the telson. He says, 

 " Telson short, only about half as long as broad." The word " again " appears to 

 have been omitted, and the description should read, " Telson short, only about half 

 as long again as broad." 



2 u 2 



