General Catalogue of South African Crustacea 373 



IBACUS VERDI (Bate). 



1888. Ibaccus verdi, Bate, Challenger Macrura, Eeports, vol. xxiv., 

 p. 58, pi. 7, fig. 2, pi. 8. 



1893. Ibacus v., Stebbing, History of Crustacea, p. 193. 



1910. I. v., Stebbing, S.A. Crustacea, pt. 5. 



No. 12962, taken by Dr. Gilchrist from 82 m. depth, Nahoon 

 Point, NW. by W. 5^ miles, appears to be a young specimen 

 of this species, with the four pairs of pleopods in a rudimentary 

 condition, very similar to those figured by Bate for his Ibacus 

 brevipes. The second antennae have on the distal joint a small 

 tooth on the inner margin, followed by three large and four 

 small teeth on the distal border. The other large joint has its 

 outer margin cut into four very small teeth with a large one at 

 the apex, and much of its anterior margin is finely denticulate. 

 The carapace, measured from between the two bosses of the 

 antennal segment to the middle of the convex hind margin, is 

 19 mm. in length ; its greatest breadth, which is at the pro- 

 duced antero-lateral apices, is 31 mm. The front margin has 

 seven denticles on the outer side of each eye. The central 

 carina carries four blunt teeth. The lateral margin has only the 

 produced apical tooth in front of the deep incision, but behind 

 this ifc forms seven teeth successively smaller. The telsonand 

 uropods are papyraceous. It may be supposed that the number 

 of denticles in different parts of the organism varies with the 

 animal's growth. A phenomenon which has been observed in 

 other crustaceans is exhibited in this specimen, namely, that 

 the stomach turned inside out has been forced out of the 

 mouth. The rapid hauling of creatures from depths at which 

 they have been subject to high pressure is eonsidered to be 

 the cause of this explosive effect. 



FAMILY PALINUEID^E. 



1888. Palinurida, Bate, Challenger Macrura, Eeports, vol. xxiv., 



p. 74. 



1902. P., Stebbing, S.A. Crustacea, pt. 2, p. 37. 

 1906. P., Eathbun, Bull. U.S. Fish Comm. for 1903, pt. 3, p. 897. 



GEN. PALINUEUS, Fabricius. 



1798. Paliuurus, Fabricius, Suppl. Ent. Syst., p. 400. 

 1900. P., Stebbing, S.A. Crustacea, pt. 1, p. 29. 



