38 



arthrobranchia of the eighth somite disappears, and the 

 branchiae are reduced to twenty on each side In As focus 

 {i.e., Potamohius, the crayfish) this branchia remains." From 

 the adjacent formulae it is evident that not an arthrobranchia 

 but a pleurobranchia is intended, and other writers have 

 pointed out that the supposed disappearance is due to an 

 oversight. 



The pleopods in both sexes appear to agree closely witli 

 those of the common lobster. On the second, third, and 

 fourth segments of the pleon there is a very small medio- 

 ventral tooth in the male, but none in the female. 



The colour (so far as known), the small size, the pubescence 

 of the body and claws, and the flattened hands of the front 

 chelipeds, will sufficiently distinguish this neat little South 

 African species, less than four inches long and less than 

 three-quarters of an inch broad, from the clumsier lobsters of 

 the North. 



Fam. : Callianassidae. 



1888. Callianassidae, Bate, Challenger Macrura, Reports, 



V. 24, p. 27. 

 1893. Callianassidae, Stebbing, Hist. Crust., p. 183. 



This family is included in the Thalassinidae by Dr. Heller 

 in 1863. Kinahan in 1859, Haswell in 1882, and Dr.de Man 

 in 1888 separate from it a family Gebidae or Grebiidae, which 

 Ortmann in 1893 suppresses. 



Gen. : Callianassa, Leach. 



1813-14. Callianassa, Leach, Edinburgh Encyclopaedia, 



Art. Crustaceology, v. 7, p. 400. 

 1837. Callianassa, Milne-Edwards, Hist. Nat. Crust., v. 2, 



P- 307. 

 1863. Callianassa, Heller, Crust, des siidlichen Europa, 



p. 201. 

 1870. Callianassa, Alphonse Milne-Edwards, Nourelles 



Archives du Museum, v. 6, p. 75. 

 1888, Calliayiassa, Bate, Challenger Macrura, Reports, 



, ^ v. 24, p. 28. 



Since the revision of the genus by Professor Alphonse 

 Milne-Edwards, referred to below, several new species have 

 been described, as C. Stimpsoni, S. I. Smith, 1874 ; 

 C. Krukenbergi, R. Neumann, 1878; the phosphorescent 

 C. Filholi, A. Milne-Edwards, 1879 ; C. madagassa, Lenz 

 and Richters, 1881 ; C. mauriliana, M.\Qrs, 1882 ; C. Martensi, 



