South African Crustacea. 39 



1888. Herterocarpus, Bate, Eep. Voy. Challenger, vol. 24, pp. 480, 



626, 627. 



1893. Stebbing, History of Crustacea, p. 238. 



1895. Faxon, Mem. Mus. Comp. Zool. Harvard, vol. 18, 



p. 148. 

 1901. Alcock, Catal. Indian Deep-sea Macrura, pp. 92, 



102. 

 1912. ,, Kemp and Sewell, Eecords Indian Mus., vol. 7, 



pt. 1, p. 20. 



Bate, in describing the genus, says that the two long and 

 slender flagella of the first antennae " both only reach a little 

 beyond the distal extremity of the rostrum," but his figure of 

 H. gibbosus contradicts this, and in his description of the 

 species he states that of these flagella " the longest is nearly 

 as long again as the rostrum." Of the nearly allied H. tri- 

 carinatus Alcock and Anderson say that " the subequal 

 antennulary flagella are more than three-fourths the length 

 of the body, rostrum included." 



HETEROCAEPUS TRICARINATUS, Alcock and Anderson. 



1894. Heterocarpus tricarinatus, Alcock and Anderson, J. Asiat. Soc. 



Bengal, vol. 83, pt. 2, p. 14 



(154). 

 1901. ,, Alcock, Catal. Indian Deep-sea 



Macrura, pp. 103, 107 ; Zool. 



Investigator, Crustacea, pi. 51, 



fig. 1. 



The authors distinguish this species from H. gibbosus, Bate, 

 1888, "by its smaller size, and by the indistinctness of the 

 lower lateral carina, which fades completely before reaching 

 the posterior half of the carapace." Alcock in 1901 says : "In 

 an egg-laden female the length of the rostrum is 21 millim., 

 of the carapace 24 millim., of the abdomen 49 millim." The 

 rough measurements taken of our single South African speci- 

 men agree almost to a nicety with the foregoing, thus giving 

 in each case a total length of 3f inches. Bate gives the entire 

 length of his species as 43 mm., but to that must evidently be 

 added 20 mm. for the rostrum and 5 mm. for the telson, 

 bringing the total to 68 mm.; even so, however, the small 

 size is no doubt due to immaturity, since Alcock records an 

 egg-laden Indian specimen measuring 156 mm. in length, 

 thus leaving H. tricarinatus much inferior in that respect, 



