Crangon and Galaihea. 77 



Rostrum moderately long, broad, apex dilated, broadly truncate, deeply sul- 

 cated, expanded over eyes laterally, slightly surpassing the eyes ; orbits shal- 

 low, broad ; eye-stalks very sliort, completely enclosed in orbits ; external 

 tooth of orbit broad, acute, attaining tip of eyes, but shorter than rostrum ; 

 orbits smooth, or clothed with a few long cilia externally. 



Carapace broad, short, rounded above, a bi-curved ridge marking out liepa- 

 tic and cardiac regions, this terminates behind frontal region in a flattened tri- 

 angular short tooth; on each side of which the gastric region bears a rounded 

 short raised lobe ; branchial teeth short and triangular, situate on same line as 

 median gastric tooth ; first pair of chelipeds robust, larger than accessory scale 

 of antennce ; propodos swollen, robust ; palm nearly transverse ; dactylos short, 

 strong, and spiniform ; meros smooth ; second pair chelipeds short, extremely 

 small ; third pair as long as first, very slender ; fourth and fifth pairs progres- 

 sively stouter. 



External maxillipeds attaining end of antennal scale, their terminal joint 

 short, broad, and blunt at its apex ; external antennce short ; scale broad, trun- 

 cate at its apex, and moderately long, surpassing the peduncle of the antennas ; 

 hyposternal spine short and triangular; abdomen smooth; first to third somites 

 nearly as broad as carapace; fourth slightly narrower than third, gibbous; fifth 

 and sixth segments suddenly narrowing, and short ; telson short, triangular, 

 spined at its margins and apex ; posterior pleopods and accessory plates long, 

 narrow, somewhat oval in shape ; hypo-abdominal spines short. 



Colour varies much. The only constant marking in the specimens captured 

 by me was the remarkable brown band across the fourth segment of the abdo- 

 men. In some specimens shades of gray and brown prevail ; in others opaque 

 white, emerald green, and varying shades of black and purplish, deck this pretty 

 species. 



Length, from 0*2 inch to 0"7 inch. 



Habitat, near Dublin, in clean sand in extreme littoral zone ; and in the 

 same bottom up to three fathoms in the dredge. At Belfast I dredged it up to 

 about ten fathoms not unfrequent, and in spawn. 



Habits extremely active, much more so than Crangon vulgaris. 



Localities, Belfast, off the Gobbins, and at Ballyholme Bay ; Dublin, Howth, 

 Sandycove, Bray. Galway, off Arran (Professor Melville). 



In ova. May to August; ova bright orange-red; when near shedding, deep brown. 



VOL. XXIV. M 



