324 Annals of the South African Museum. 



2 segments. Telson as long as all the preceding pleon segments 

 together, narrow, parallel-sided, slightly widening before the insertion 

 of the uropods, then tapering rapidly to a subacute apex. 



Ventral surfaces of peraeon segments 1-7 and pleon segment 1 each 

 with a long straight spiniform process. 



First antenna, 1st joint elongate, narrow, 2nd half length of 1st, 

 3rd very short, flagellum shorter than peduncle, ca. 11-joiuted, acces- 

 sory flagellum 4- jointed. 



Second antenna equal to peduncle of 1st, 2nd joint narrow, linear, 

 with a narrow, linear scale, 5th shorter than 4th, flagellum 6 -jointed. 

 Epistome with a prominent straight spine. 



First peraeopod moderately slender, 5th joint equal to 2nd, 4th 

 shorter, 6th slender, thumb long and narrow, inner margin faintly 

 ci'enulated, setulose, finger matching thumb, evenly curved, nail on 

 both thumb and finger rather long ; exopod with 2 linear joints, 2nd 

 with 4 setae. 



Second peraeopod slender, the distal joints narrower than the 

 proximal ones, 5th and 6th both shorter than 4th, both linear ; exopod 

 as in 1st peraeopod. 



Third to 6th peraeopods slender, distal joints moderately setose. 

 Seventh peraeopod short, 3- jointed, 2nd longer than 1st, 3rd very 

 short, unarmed ; absent altogether in the smaller (2 - 5 mm.) specimen. 

 Uropod, only one ramus present, probably the outer, 4-jointed. 

 Length: 5mm.; breadth: '75 mm. 

 Colour: In spirit white. 



Locality: Cape Point 1ST. 89 E., distance 36 miles. 700 fathoms. 

 2 immature specimens. s.s. " Pieter Faure." 20/8/03. (S.A.M. 

 No. A4136.) 



This is evidently an immature form, as shown by the small un- 

 developed 7th peraeopod in the large specimen. The species to which 

 it seems nearest is A. simplicirostris Norm. & Stebb. (Tr. Linn. Soc. 

 Lond. vol. 12, 1886, p. 91, pi. 18, fig. 1) from the North Atlantic, 

 1263 fathoms. There is a close resemblance in the general body form 

 and the structure of the individual segments, in the antennae, the 

 narrow linear distal joints of the 2nd peraeopod, and the armature in 

 the 3rd-6th peraeopods. 



On the other hand there are distinct differences : in the Cape speci- 

 mens the carapace is broader across the front, the rostrum lacks the 

 bulbous projections at its base, the ocular lobes are much longer, the 

 side-plate on segment 2 is acutely produced, and there is a greater 

 relative difference between the anterior and posterior width of the 

 5th-7th peraeou segments. 



