314 



DISCOVERY REPORTS 



Liitken, 1873, p. 276, pi. iv, fig. 9. 



Mayer, 1882, pp. 186, 187, text-figs. 37, 38; 1890, pp. 147, 150, pi. vi, figs. 43, 44; pi. vii, 



fig. 19 (globicipitis). 

 Chevreux, 1913 a, p. 15 (globicipitis). 

 Chevreux and Fage, 1925, p. 462, fig. 438 (globicipitis). 



Occurrence: 1. St. i4°45'N, 18 24' W. 27. x. 25. On Dolphin A. 4 <$<$, 5 $$ (some with 

 embryos), 4 immat. <£<£, 2 immat. ??. 

 2. Same station. On Dolphin B. 1^,1 ovig. <j>, 3 immat. $?, 8 juv. 



Description. General outline of peraeon in dorsal view ovate in both sexes, the ? 

 not broader than the J. Head and segment 1 completely fused, short, strongly bent 



downwards. Eyes present (as in other species). Peraeon 

 segment 2 embracing base of segment 1 . Segments 3 

 and 4 broader than segment 2 (no specimens with 

 these narrower, as in Chevreux and Fage's figure). 



On ventral surface in $ a pair of blunt inwardly 

 directed processes on segment 5, and a pair of pointed 

 tubercles on both segments 6 and 7; in $ a pair of 

 tubercles on each of segments 5-7; more strongly 

 developed than in $. 



Antenna 1, 1st and 2nd joints obovate, widening 

 distally. Antenna 2 very small. 



Gnathopod 1, 5th joint ovate, 6th distally pectinate, 

 unguis distinct. Gnathopod 2, 4th joint prominently 

 projecting on inner (lower) side, apically rounded, 

 5th with a single strong pointed tooth on inner margin 

 near hinge. 



Peraeopods 5-7, 2nd joint without projecting apical 



tubercle on lower surface, 3rd with anterior margin 



acutely produced, 4th broadly pyriform, distal angles 



not prominent. 



Branchiae single on both segments 3 and 4, short and stout, accessory appendages in 



c? similar to and almost as long as the branchiae themselves, single on each segment, 



absent in $; at the base of each branchia is a pointed process, directed outwards, in 



both sexes. 



Length: £ 6-5 mm., 9 6 mm. 



Remarks. Both Brandt and Liitken were inclined to regard globicipitis and delphini 

 as synonymous. C. chelipes, Costa, 1866 (Ann. Mns. Napoli., ill, p. 82, pi. iv, fig. 2), also 

 found on a dolphin, appears to be distinct from the present species; but whether it 

 belongs to the genus hocyamiis is impossible to tell, as the description is inadequate. 



The present species has been recorded from Dolphins and the Black Fish (Globi- 

 cephalus melas) ; also from Grampus griseus and Pseudorca crassidens near the Azores 

 (Chevreux, 1913 a). 



Fig. 174. Isocyamns delphini (Guer.). 

 a. Dorsal view of (J. b. Gnathopod 1 <J, 

 with dactyl and unguis further enlarged. 

 c. Branchia $. 



