South African Crustacea. 59 



1914. Calocaris, Stebbing, Ann. S. African Mus., vol. 15, pt. 1, 



p. 9. 



Other references for the family and genus are given in the 

 last-mentioned paper. 



CALOCARIS ALCOCKI, McArdle. 



1900. Calocaris alcocki, McArdle, Ann. Nat. Hist., Ser. 7, vol. 6. 



p. 476. 



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



pp. 189, 190 ; Zool. Investigator, 

 Crust., pt. 9, pi. 50, figs. 4, 4a. 



McArdle's specimen, measuring 54 mm. in length, was 

 taken in the Bay of Bengal, off Ceylon, from a depth of 542 

 fathoms. The description given of it essentially fits the South 

 African example. Thus, to quote from Alcock, " the rostrum, 

 which reaches to the end of the antennular peduncle, is up- 

 curved and dorsally grooved ; on either lateral border, near the 

 middle, are 1 or 2 spines, and on each of the epigastric con- 

 tinuations of the lateral borders is a single spine." In our 

 specimen the upturned apex of the rostrum reaches somewhat 

 beyond the peduncle of the first antennae, but so it appears 

 to do in the figure on Plate 50 of the Investigator's Crustacea. 

 It may bo only an accidental coincidence, but it may be noticed 

 that the African rostrum has 2 spines on the left margin and 

 only 1 spine on the right. The considerable length of the 

 penultimate joint in the peduncle of the second antennae as 

 compared with the terminal joint should be noticed, as it is a 

 mark distinguishing this species from the recently established 

 C. barnardi. Only one of the flagella was preserved in the first 

 antennae, and the same seems to have been the case with the 

 Indian specimen, which, however, retained the flagellum of 

 the second pair, missing in ours. No special notes are given 

 on the mouth-organs of the Indian specimen, except that the 

 fourth joint of the third rnaxillipeds " has a subterminal spine 

 on the inner border." This applies equally to ours, if we accept 

 the term spine as signifying a small unjointed tooth. In 

 C. barnardi this tooth is also present, though much obscured 

 by the crowded setae, but that species shows a great difference 

 in the denticulate border of the third joint, having some nine 

 strong teeth in place of the 28 mixed large and small which 

 form the row in the present species, in addition to an irregu- 



