■ 02 DISCOVERY REPORTS 



(Fig. 20 A, B). Antennal peduncle comparatively robust, extending slightly beyond the distal margin of 

 the antennular peduncle ; scale ovate ; outer margin short, terminating in a strong tooth ; apex long, 

 comprising more than half of the total scale and extending for more than half its length beyond the 

 antennular peduncle; outer distal angle of the sympod produced into a strong tooth (Fig. 20 A, B). 

 Eyeplates large and deep with a small median cleft ; margins entire with no trace of serrulations. In 

 the male the anterior margin is straight and there is a suggestion of a protuberance or angle in the 

 antero-lateral region. In the female both the anterior and lateral margins are evenly arcuate 

 (Fig. 20 A, B). Labrutn large, with evenly rounded anterior margin. Endopods of third to eighth 

 thoracic appendages shorter than in most species of the genus (Fig. 20 C). Male genital organ long and 

 cylindrical, armed at the apex with a single long seta (Fig. 20 D). Pleopods of the male as described for 

 the genus; exopod of fourth pair slightly longer than the endopod (Fig. 20 E). Uropods with no spines 



Fig. 20. Pseudomma minutum sp.n. A, anterior end of immature male in dorsal view, x 45 ; B, anterior end of adult female 

 in dorsal view, x 36; C, endopod of fourth thoracic appendage, X45; D, genital organ of male, X45; E, fourth pleopod of 

 immature male, x 45 ; F. telson and right uropod of immature male, x 45 ; G, telson and uropods of adult female, x 34. 



arming the inner margin of the endopods (Fig. 20 F, G). Telson triangular, very short, length equal to 

 its breadth at the base and only slightly more than half as long as the sixth abdominal somite ; lateral 

 margins straight, converging evenly to the small apex ; each armed with 2-3 very small spines, which 

 are confined to the distal third of the length; apex narrowly rounded, armed with a pair of long 

 spines nearly one-third of the telson in length, and a pair of median plumose setae (Fig. 20 F, G). 



Length of largest <J, 4'4 mm.; of $, 4-6 mm. 



Remarks. This species closely resembles P. roseum G. O. Sars in the form and proportions of the 

 anterior end, the anterior end of the carapace, the eyeplates, and the antennal scale, but differs in 

 having no serrulations on the antero-lateral margins of the eyeplates. It may at once be distinguished 

 from all other species of the genus by its small size and by the very short triangular telson which in 

 shape recalls those usually found in the genus Erythrops. 



Distribution. Pseudomma minutum was taken at four stations in the present collection, all situated 

 near the Falkland Is. All the captures were made by day in water of 105-278 m. in depth. 



