(23) 



2. Smith African Crustacea (Part IX. of S.A. Crustacea, for the 

 Marine Investigations in South Africa). By the Rev. THOMAS 

 R. R. STEBBING, M.A., F.R.S., F.L.S., F.Z.S., Fellow of King's 

 College, London, Hon. Memb. of New Zealand lust., Hon. Fellow 

 Worcester College, Oxford. 



(Plates I- VIII of Vol. XVII. Plates XC-XCVII of Crustacea.) 



OF the eighteen species here considered, sixteen belong to the 

 Malacostraca and two to the parasitic Copepoda. Three of the 

 plates refer to species discussed in Part VIII of these Investigations, 

 and illustrations are offered of forms named by various authors in 

 cases where it seemed desirable by this means either to establish the 

 identification of the specimens concerned or to give experts a reason- 

 able opportunity of correcting it. 



With regard to Philocheras megalocheir, described in Part VIII, 

 it is right to mention that Mr. Stanley Kemp in 1912 argued that 

 Pontoj.ihilus, Leach, and Philocheras were so connected by intermediate 

 species that Philocheras could not properly be separated from the 

 earlier Pontopliilus. It is interesting to remember that for a long 

 time science was engaged in splitting up comprehensive genera such 

 as Cancer into an endless number of subdivisions. Now, with the 

 discovery of links and gradations, there is a natural tendency to 

 reunite the severed parts. 



