1922.] 



S. Kemp : Notes on Crustacea Decapoda. 



277 



Text-fig. 102. — Coralliflcaris lucina 

 Nobili. 



Third maxilliped (arthrobranch omitted). 



(i) The hepatic spine of the carapace is present. 



(ii) The third maxilliped (text-fig. 102) is very slender. The 

 penultimate segment is fully 

 2*5 times as long as wide and 

 is slightly shorter than the 

 ultimate segment, the latter 

 being about 5 times as long as 

 wide. The exopod does not 

 nearly reach the end of the 

 endopod. 



(iii) The first peraeopods are 

 extremely slender. The carpus 

 varies from 18 to 2 '5 times 

 the length of the chela. The 

 fingers are only half as long as 

 the palm. 



(iv) The second peraeopods 

 are unequal and dissimilar in 

 structure. There is a tooth 

 externally at the distal end of 

 the lower border of the merus, 

 but no terminal spine on the 



upper border. The carpus does not possess the large ventral tooth 

 found in the preceding species and the superior part of the distal 

 margin is entire. In the larger chela the palm is slender and from 

 3*5 to 4 times the length of the fingers. The fingers are twisted, so 

 that the chela opens almost vertically instead of horizontally. As in 

 S. superba the dactylus is longitudinally carinate on its outer face 

 and is abruptly angulate in the middle of its outer margin. On the 

 inner margin of the dactylus there are 2 or 3 teeth placed near 

 the middle and, when the claw is closed, the cutting edge of the 

 dactylus fits between two slightly oblique crests on the fixed 

 finger, that nearest the base bearing 2 or 3 small teeth. In the 

 smaller chela the fingers are about two-thirds the length of the 

 palm. The fingers have straight unarmed inner margins, but each 

 is externally excavate, so that the whole chela, when viewed from 

 1he outer side is spoon-shaped. 



In the specimens I have examined there are from 3 to 6 teeth 

 (usually 4 or 5) on the upper border of the rostrum and from I to 

 3 (nearly always 2 or 3) on the ventral border. De Man describes 

 the apex of the telson as armed with 16 to 18 spines — a remarkable 

 feature not known in any other Pontoniid. In most of my speci- 

 mens only the usual 6 terminal spines are to be found, but I have 

 seen an individual in which there are 9. 



The largest specimen examined is about 16 mm. in length. 



When alive the species is transparent, with colourless chelae 

 and with the carapace and abdomen longitudinally streaked and 

 speckled with bright red. 



It is possible, as de Man has suggested, that this species is the 

 same as Stimpson's C. lamellirostris. The description of the latter 



