410 Surg.-Capt. A. Alcock on 



on the median lobe of the carapace and between the sublateral 

 carinae of the free thoracic and abdominal terga than at the 

 sides. Rostrum oblong, with slightly convergent concave 

 and upturned sides, rounded antero- lateral angk-s, and concave 

 or straight or slightly arched anterior margin, without longi- 

 tudinal ridge, but with a slightly rounded elevation in the 

 middle. 



" Eyes large, asymmetrical in themselves, both lobes being 

 greatly produced, the major diameter of their corneai con- 

 tained two and a half times in the antennal scale. 



" Processes of antennulary ring curved, sharp, submu- 

 cronate-triangular, 



" Anterior end of ventral arc of optic ring weakly arched, 

 with a small subacute tooth at each antero-lateral angle, 

 ventrally convex posteriorly, the nauplius eye persistent on 

 the anterior slope of the convexity. 



" Median dorsal ridge of anterior lobe of carapace forked 

 just in front of the dorsal tubercles, the prongs of the fork 

 straight, contained about 2^ times in the whole ridge. 

 Carapace obtuse-angulated at the junction of the lateral and 

 postero-lateral margins. 



" The acute lobes of the outer ends of the fifth thoracic 

 tei'gum are separated by a wide notch, the anterior lobe 

 tending towards the ventral position ; anterior lobe of the 

 outer end of the sixth tergum is squarish, with the hinder 

 angle acute. 



" The dorsal crest of the carpopodite of the great raptorial 

 limbs is entire ; the dactylopodite weak and slender, its outer 

 margin level for a short distance at the very base, whence it 

 is regularly arched to the extremity, six-toothed, all the teeth 

 distinctly separate to the very base ; the outer and inferior 

 apex of the meropodite is not spinous. 



" Interrupted dorsal tubercles on second to fifth abdominal 

 terga not cariniform ; of the abdominal terga the lateral 

 carinas of the first to sixtli, the sublateral carinte of the third 

 to sixth, and the submedian carina? of the fifth and sixtii 

 terminate in a spine. 



" Telson thin, with the submedian and sublateral spines 

 of its free margin long and slender, with ten teeth between 

 the submedians and fourteen between the submedian and 

 sublateral on each side ; median crest faintly notched ; oblique 

 ridges very short. 



"In the caudal swimmerets the spinous prolongation of 

 the base is exceedingly slender, with the blunt tooth on the 

 outer margin of its inner and longer lobe reduced to a rudi- 



