189 

 Key to the species of Calocaris. 



I. The rostrum reaches only to the end of the basal joint of the antennular 

 peduncle : the penultimate joint of the antennal peduncle is not twice 

 the length of the 2nd joint ... ... ... ... C. macandrese. 



II. The rostrum reaches to the end of the antennular peduncle : the penulti- 

 mate joint of the antennal peduncle is moi*e than three times the length 

 of the 2nd joint ... ... ... ... ... G. alcocki. 



109. Calocaris macandrew, Bell. 



Calocaris macandrex, Bell, British Stalk-eyed Crustacea, p. 233, fig.: Kirk, Trans. New Zealand Inst. XI. 

 1878, p. 401 : S. I. Smith, Trans. Connect. Acad. Sci. V. 1878-82, p. 55 : G. 0. Sars, Arch. f. Math. Naturv. IX. 

 1884, p. 166, pi. ii. : Lovett, Zoologist (3) IX. 1885, p. 16 : Cams, Prodr. Faan. Medit. I. p. 490: Ortmann, Zool. 

 Jahrb., Syst., VI. 1891-92, p. 50, pi. i. fig. 5 : Alcock and Anderson, Jonrn. Asiatic Soc. Bengal, LXIII. pt. 2, 1894, 

 p. 163 : Adensamer, Denk. Ak. Wien. Math. -Nat. CI. LXV., 1898, p. 621 : Anrivillius, Bihang Svensk. Vetensk- 

 Akad. Handl. XXIV., iv. No. 4, 1899, p. 36. 



Carapace (rostrum included) measured in the middle line, hardly as long as 

 the first 5 abdominal somites combined, smooth, sharply carinated in the middle 

 line, the cervical groove fine but distinct, the branchial groove indistinct. 



The rostrum, which reaches the end of the basal joint of the antennal ped- 

 uncle, has its salient and sharply serrated lateral borders produced backwards 

 on to the gastric region. 



Abdomen smooth : the pleura of the 1st somite subacute, the others broadly 

 rounded, decreasing in length from the 2nd to the 5th. Telson broadly rounded 

 off, as long as the caudal swimmerets, all with smooth edges. 



Eyes large, globose, subsessile, translucent. The 1st joint of the antennular 

 peduncle has its base somewhat expanded. 



The " scaphocerite " projects hardly as far as the base of the penultimate 

 joint of the antennal peduncle and the " stylocerite " is still more minute : the 

 penultimate joint of the peduncle is not twice as long as the 2nd joint. 



The external maxillipeds reach beyond the end of the antennular peduncle ; 

 the inner border of the ischium is elegantly toothed, but that of the merus is 

 unarmed. ♦ 



In the male the large chelipeds are about two-thirds the length of the body 

 and the hand forms nearly half their length, but in the female they are not quite 

 so long and the proportion of the hand is a little less : they are quite smooth, 

 except for 2 or 3 spinules on the lower border of the merus, a spinule at the far 

 end of the upper border of the merus, 2 carina? each ending in a spine along the 

 upper border of the palm, and a few granules on the inner surface of the palm 

 near the finger joint : the palm is a little longer than the wrist, and the fingers 

 are about three times as long as the palm : the fingers are compressed slender 

 and pointed, and the cutting-edge of only the fixed finger is finely serrated. 



