REPORT ON THE AMPHIPODA. 75 



"Cancer palmatus, Tab. vi. Fig. 4. With a smooth, somewhat compressed body, with thirteen 

 joints : colour, when dead, pale yellowish brown : antennae four, superior pair longest, half 

 the length of the body ; each pair composed of three large joints, with several small articula- 

 tions at the end : eyes large, fixed : arms two ; hands remarkably large, flat, triangular, fur- 

 nished at the upper angle with a moveable fang, capable only of closing upon the middle or 

 palm, which is formed a little concave ; the back of the liand convex ; joint of the wrist 

 deeply cut or indented on the lower side : legs six ; thighs broad, flat: caudal fins two pairs, 

 subulate, with two joints each ; the extreme joint of the tail is furnished with two small 

 appendages; the nest joint with two minute spines; the third joint with a single spine. 

 Length, three-eighths of an inch." This is now called Melita pahnata. 



" Cancer articulosus, Tab. vL Fig. 6. With an oblong, smooth, glossy body, a little compressed 

 on the sides, with eleven joints, of a cream colour when dead : antennae four, the upper 

 pair longest, but not half so long as the body : eyes large, of a garnet colour, immoveable : 

 arms four, of a very singular form ; the foremost pair with a subglobose, cheliform hand, 

 with the fixed claw very slender, and the moveable one, or thumb, long and double-jointed, 

 or furnished with an additional hooked fang at the end : second pair with an ovate, oblong 

 hand, furnishetl with one long moveable hooked fang; at the wrist arises a compressed 

 slender plate, projecting forward, and almost meeting the fang when closed : legs five pairs, 

 small, subulate : tail terminated by several slender, flat, caudal fins. Length, half an inch. 

 Inhabits the deep : taken by the dredge amongst shells and algsp." This, having since been 

 identified with Gammarus spinicarpus, Abildgaard, 1789, and made the type of a new 

 genus, is now called Leuoothae spinicarpa. 



1805. ViVIANI, DOMENICO. 



Phosphorescentia maris quatuordecim lucescentium animalculorum novis 

 speciebus illustrata a Dominico Viviani. Genuae, 1805. 



In his discussion of the causes of the phosphorescent appearance of the sea, Viviani says " Luces- 

 ccntibus animalculis immixtje, nonnullas reperiuntur in mari species, quae licet ob parvam 



u/utru </el et So. 



TAB.J 



Fig. 16. 



corporis molem, et reliquam ejusdem compagem, maxima adfiuitate uniantur, nulla vero 

 phosphorica facultate gaudent (Gammarus crassimanus 7iob. Gammanis Pulex, etagnalis, 



