Contributions to the Crustacean Fauna of South Africa. 233 



if any representatives were found in South America. The discovery 

 of a species on Table Mountain, South Africa, is therefore of great 

 interest, as being one more fact in support of the existence of an 

 ancient land-mass connecting the Southern continents (Gondwana- 

 land). 



PHREATOICUS CAPENSIS, n. sp. 

 (Plates XXIII. and XXIV.) 



Specific diagnosis. Body rather stout, surface with short scattered 

 hairs, eyes well developed, head not as long as first and second 

 peraeon segments together, first and second peraeon segments 

 subequal in length, penultimate joint of first antenna as long as 

 the preceding three joints together, second antenna four-sevenths 

 of the total length, right mandible with secondary cutting-edge, 

 sixth joint of first peraeopod (gnathopod) with the palm not well 

 defined, fifth pleon segment as long as third and fourth together, 

 with the posterior margin notched, pleopods 3-5 with epipodites, 

 telson deeply concave above the terminal projection, lower margin 

 straight, uropods not extending beyond end of telson. 



Colour: Slaty-grey with lighter crescentic niottlings on sides 

 of the peraeon and pleon ; they are large on the anterior segments, 

 but become smaller posteriorly. 



Length : Up to 14 mm. 



Habitat : Four specimens from near the reservoir on the top of 

 Table Mountain (C. J. French, March 4, 1913). On May 1, 1913, 

 Mr. S. H. Haughton and myself found numerous specimens under 

 the moss growing on the stones in the bed of a swiftly running 

 stream, near the reservoir at an altitude of about 3,000 ft. Several 

 of them were pairing ; the males are slightly larger than the 

 females. 



Prof. E. Goddard tells me he found the species some years ago 

 on Table Mountain, but did not describe it. I have to express 

 my thanks to him for permitting me to do this, and also for 

 giving me Tasmanian specimens of P. australis for comparison. 



The following detailed description is taken from the three largest 

 specimens (11-14 mm.), 2<? J and 1 5 ; these specimens are in the 

 South African Museum (No. A2257). 



The Body is rather stout, the pleon long in proportion to the 

 rest of the body. Using Sayce's method and reckoning the cephalon 

 and peraeon as 100, then the pleon measures 70-75. The greatest 

 depth of the pleon is equal to the breadth of the peraeon segments 

 and a little more than twice their depth. The surface of the head 



