Crustacean Fauna of South Africa. 231 
given by Stebbing in 1906, by which Thomson’s species can be dis- 
tinguished from Koyer’s, appear to be constantly correlated. The 
degree of approximation of the lobe of the 5th joint of Ist gnathopod 
¢ to the apex varies, as does also the expansion of the 2nd joint of 
the 2nd gnathopod and the seta on finger of peraeopods 1-5. 
The most constantly correlated characters (and even these are not 
always found together in the same specimen) appear to be: the 
solitary spines on 4th joint of peraeopods 3-5, marginal spines on 
both rami of Ist uropod and the 8rd pleon segment with the postero- 
inferior angle slightly produced. But solitary spines on 4th joint of 
peraeopods 3-5 may occur with spines on only the inner ramus and a 
quadrate postero-inferior angle to pleon segment 3. Other combina- 
tions of these supposedly distinguishing characters also occur. 
The following points about the South African species may be 
mentioned: Neither the 2nd nor 38rd joints of Ist gnathopod are lobed, 
lobe of 5th projecting a little beyond 4th, furnished with short spines 
and longer setae; 2nd joint of 2nd gnathopod with a straight-edged 
apically quadrate keel on anterior margin but no projecting rounded 
lobe, 3rd with a small lobe, hind margin of 4th joint of peraeopods 3-5 
with 4 spines either solitary or each set in a bunch of setae, anterior 
margin of 6th with 4 (peraeopod 3) or 5 (peraeopods 4 and 5) spines, all 
of the same size and not apically serrulate, each set in a group of setae ; 
setule on inner apex of finger varying from very delicate to fairly 
strong; hind margin of 2nd joint of peraeopods 3-5 with slight 
setuliferous idents, posterior margin in peraeopod 5 rather deeply 
excavate between the rounded postero-inferior angle and 3rd joint. 
Length: Uptol7 mm. ¢, 14mm. 2. 
Colour: Dark reddish or greenish brown, with squarish dorsal 
lighter ‘spots. 
Locality : Table Bay (Cape Town). (Dr. W. F. Purcell, K.H.B.) ; 
False Bay (Buffel’s Bay) and St. James. (K.H.B.); East London. 
(R. M. Lightfoot.) g 3, ovigerous 2 2 and young; Port Elizabeth. 
February, 1915. (Mrs. Paterson.) (8.A.M. Nos. 1265, A2516, A3051, 
A3052, and A3S282.) 
Geogr. Distribution: Valparaiso (Kroyer: O. grandicornis, Dana: 
A. verticillata) ; Otago, N.Z., Macquarie Is. and the Snares (Thomson 
and Chilton : N. novaezealandiae) ; Gough Island (Chilton: H. grandi- 
cornis). 
Most of the East London specimens belong to the form novae- 
zealandiae, but examples of this form occur also among the Cape 
Peninsula specimens, which are mostly grandicornis, and vice versi. 
Specimens which are intermediate and combine the characters of the 
