﻿South African Cmstacca. 21 



The many striking points of resemblance between the species for 

 which the new genus is proposed and Ealiporns sibogae, de Man, 

 1911, greatly perplexed me in view of the undoubted fact that the 

 new species differed not only from de Man's species, but, so far as I 

 could find, from the whole known range of the Penaeidae in having 

 the palp of the mandible three-jointed. Eecently, however. Caiman 

 has pomted out that Boas in 1880 assigned a three-jointed palp to 

 the mandible in Stcyonia, which he himself has verified for Sicyonia 

 cannatus (Olivier), adding the same character for Bemthesicymus 

 tnvestigatoris, Anderson, thus for the former species controverting 

 Bate's express statement, and for the latter the generic definition 

 alike of Bate and of Alcock. 



Halipoeoides triarthkus, n. sp. 

 Plates LXX., LXXI. 

 The carapace has a medio-dorsal carina beginning some way in 

 front of the hind margin, with a slight depression where the arms of 

 the cervical groove nearly meet it ; thence it ascends to a denticle, 

 followed by a second, remote and reaching to a point level with the 

 base of the orbit ; at a rather less distance a series of eight denticles 

 begins, running along the arch of the rostrum, leaving a space inter- 

 vening to the upturned apical tooth, behind which on the ventral 

 margin there is a denticle about on a level with the foremost denticle 

 on the upper edge; to the rear the margin is concave, closely 

 fringed with setules. Some specimens have a second ventral 

 denticle. The front of the carapace has on each side a small 

 antero-lateral tooth, a larger antennal tooth leading to a short carina 

 at the back of which is another carinate tooth, while further back 

 and lower down is a denticle at the end of the cervical sulcus. The 

 telson is shorter than the uropods, apically acute, with fringes of 

 setae and two divergent processes, about half as long as the portion 

 of the telson from their bases to its apex. 



Both flagella of the first antenna are elongate, one much longer 

 than the other. The flagellum of the second antenna attains a great 

 length, in one specimen, not the largest, being 200 mm. long. 



The first joint of the mandibular palp is perfectly distinct, rather 

 broader than long, the very large second joint is almost twice as long 

 as the third, and in its expanded proximal half more than twice as 

 broad. The lower lip is perfectly smooth. The palp or terminal 

 joint of the endopod in both the first and second maxillae is com- 

 pletely fringed on both margins with setae or spines, except for a 



