Contributions to the Crustacean Fauna of South Africa. 425 



6 posterior peraeon segments together, consisting of a single segment 

 with 3 lateral sutures, the basal one of which is very faintly marked 

 up to the median line, where however it disappears entirely. Telson 

 with straight sides and a low rounded median keel, on either side of 

 which the telson is nearly flat, not convex ; the apical margin between 

 the acute postero-lateral angles is straight or very slightly convex ; a 

 short but distinct keel runs along the postero-lateral angles. 



First antenna reaching to end of 2nd peduncular joint of second 

 antenna, resembling that of P. ungulata (Pallas). 



Second antenna reaching to middle or posterior margin of 5th 

 peraeon segment, inner apex of 3rd, 4th and 5th peduncular joints 

 produced, flagellum with from 24 joints in a small specimen to 32 in 

 the largest specimens. 



The mouth parts resemble those of P. ungulata except that the 

 lateral margins of the epistome are angular, not evenly convex, and 

 the inner lobe of the first maxilla has only 3 plumose setae. 



Peraeopods stout, 6th joint of 1st peraeopods setose on inner 

 margin, with a short spiniform tubercle near the base ; 6th joint of 

 2nd and 3rd peraeopods not setose, with spine near base and 2-3 

 setae at apex, in 2 the basal spine is absent but represented by a 

 tuft of 2-3 setae ; 6th joint of remaining peraeopods with 2 tufts of 

 2-3 setae, one near base, the other at apex ; 3rd and 4th joints not 

 produced externally on any of the peraeopods. 



Pleopods as in P. ungulata. 



Uropdds with strong rounded longitudinal keel on peduncle, ramus 

 -| as long as broad, apical margin truncate. 



Length: 63mm.; breadth: 16mm. 



Colour : Deep orange-brown with black reticulations, a median 

 stripe on peraeon and base of pleon and telson and the postero- 

 lateral angles of telson green ; peduncular joints of second antennae 

 and the joints of the peraeopods with dark apical bands. 



Locality : Table Bay (washed up on beach), April, 1913. 1 $ 

 and 1 $ with young. (L. Peringuey, juu.) ; Table Bay. 26/3/96. 

 1 immature?, s.s. " Pieter Faure." Sea Point, near Cape Town. 

 13/4/14. (K.H.B.) $ $ , ovigerous ? ? and juv. On the stalks 

 and fronds of the Sea Bamboo (Ecklonia buccinalis) at low-tide. 

 (S.A.M. Nos. A2645, A7 and A2724.) 



Although on a cursory glance this species appears very similar to 

 P. ungulata, it is nevertheless easily separated by a number of 

 characters, viz. : the lesser convexity of the body, the shape of the 

 epirnera and sterna (in P. ungulata the sterna are rounded posteriorly, 

 without the postero-lateral angles and with only a median notch), the 



