96 DISCOVERY REPORTS 



endopod. The setae are broken in all the male specimens at my disposal, but the remnants do not 

 appear to be modified (Fig. 16 F). Uropods short and compact with the endopod extending only 

 slightly beyond the distal end of the apical spines of the telson ; exopod truncate distally and only 

 slightly longer than the endopod (Fig. 16G). Telson in the shape of a trapezium, which is symmetrical 

 about its long axis; twice as broad at the base as at the apex; lateral margins convex at the base, but 

 somewhat concave along the distal two-thirds of their length ; armed with 5-6 small spines on each 

 side ; penultimate lateral spine larger than the more proximal ones, the most distal one twice as long as 

 the penultimate and half as long as the outermost apical spine on each side. These two spines are 





Fig. 16. Pseudomma calmani sp.n. A, anterior end of adult male in dorsal view ; B, left antenna ; C, eyeplate ; D, eighth thoracic 

 appendage of male; E, distal end of endopod of eighth thoracic appendage (enlarged); F, fourth pleopod of male; G, telson 

 and uropods of adult male in dorsal view. All x 26. 



borne close to the apex and form, with the graduated apical spines, a regularly graduated series. Apex 

 armed with three pairs of long spines, which increase in length towards the middle line ; median pair 

 of spines about one-fifth of the length of the telson; pair of median setae present (Fig. 16G). 



Length. Adult breeding females from station 219 measured 5-5 mm. from the anterior margin of 

 the eyeplate to the apex of the telson and two adult females from station 229 measured just over 7 mm. 

 The largest specimens were two males which measured 8-5 mm., from station 801. 



Remarks. This species has been taken with P. sarsi, but may be readily distinguished from it by 

 its smaller size, by its comparatively shorter and thicker antennules and antennae, by the longer apex 

 of the antennal scale and, above all, by the entire margins of the eyeplates. I have been much worried 

 over the specimens which I have referred to this species, because they display individual differences in 



