DTTBLI17 NATX7IUL HI8T0BT SOaSTT. 49 



but the characters which mark it out are so constant and trenchant, 

 that I feel no hesitation in asserting its claims to specific distinction, and 

 most probably it will be found to be one of our best-marked northern 

 types, as I have not seen any specimens of it in southern or western 

 collections, and the only notice I find of it in English works is by Dr. 

 Howden, Scotland. 



HiPPOLYTE PUSiOLA {Kroyef). 



Rostrum short, curved upwards; apex acuminate^ 3-4 dentate above ; 

 below unarmed; a strong tooth arising from carapace immediately over 

 eye ; median plate of tail 4 pairs of spines ; wrist of second pair of legs 

 4-jointed. 



The whole animal is much larger and more truncate than H. Cranchii; 

 the rostrum narrower; apex slightly curved upwards, simple; the 

 rostrum armed with 3-4 curved teeth above ; external antenna as long 

 as the entire body ; the antennal scale rounded at its inner superior ex- 

 tremity ; the lateral tooth terminal and its peduncle strongly toothed 

 externally; internal antennae hairy, the inferior external angle of the 

 articulation prolonged into a curved scimitar-shaped lobe, the superior 

 angle prolonged into a tooth; second and third articulations also toothed ; 

 anterior feet slightly shorter than antennal scale, stout. 



Second pair of feet, — wrists made up of four articulations, the total 

 number in the whole limb being eleven, including the hand ; the first, 

 second, and third very short and somewhat triangular; the fourth, 

 fifth, and sixth long, slender, and equal among themselves ; seventh, 

 slightly shorter, cylindrical, slender, a few scattered hairs over its ex- 

 ternal surface ; eighth and ninth very shorty scarcely conjoined equalling 

 seventh, equal and globular; tenth, equalling seventh. A strong tooth over 

 each eye at base of rostrum, and a small tooth over origin of antennae. 



Colour, rose-pink or green, though there is much variety in this ; 

 one specimen (a female), taken in May, was coloured as follows : — 

 Carapace, a transparent clear pink, with which the emerald-green 

 masses of Extruded ova contrasted most vividly, tail and segments of legs 

 being banded with white and rose colour. Another specimen was even 

 more vividly coloured : — Carapace clear cobalt-blue, through which the 

 emerald-green masses of ova shone, the remainder of the body a clear 

 pink ; the legs prettily banded with a darker red. 



It has only occurred to me in comparatively deeper water, as at Bray 

 and in Dalkey, where it is frequent in the lobster and crab pots. Of its 

 distribution nothing is known : it has been recorded in Scotland by Dr. 

 Howden, from Frith of Forth and Orkney. 



The characters of the rostrum and carapace; second pair of legs, 

 median plate of tail ; size ; and difference of locality separate it markedly 

 from //. Cranchii {videVloiQ X., Figs. 7, 8, 9, 10, and Plate IX., Figs. 

 2a, 2b). 



Palanion squilla. — Extremely common in rock-pools, especially 

 among Enteromarpha intestinalis. In ova in May, April, and June. Of 

 one remarkable form of this species (?) I have figured the beak (Plate X., 

 Figs. 11, 12, 13, 14); it is invariably much smaller than the normal 



