122 
HISTORY OF BRITISH CRUSTACEA. 
“ The upper parts nearly white, the rest light pellucid purple, 
in which the blue or the red element prevails in irregular 
patches. The hue is most positive on the legs, where it is 
banded ; on the terminal segment of the abdomen ; on the tail- 
plates, and on the false feet. The extruded ova, which form 
a large mass, are white, becoming olive. Sometimes the 
whole animal is of a pellucid drab hue, with scattered pur- 
ple specks. A narrow band of whitish drab runs along the 
median line of the abdomen, and expands into a broad oval 
spot on the fourth segment.” 
Dr. James Howden alludes to a species near this, which 
is common at Grail in Fife, and was taken in Orkney also by 
Professor Fleming. He describes it as having a shorter beak, 
more depressed, and not bidentate at the tip; the wrist of 
second pair of legs with seven joints, and the central plate 
of tail as having five pairs of teeth instead of four. (Trans. 
Roy. Phys. Soc. 1853.) 
Hippolyte Yarrellii, Thompson. — Beak short, bent 
downwards, incurved at the base, with four spinous teeth 
above; apex tridentate, upper tooth the longest, middle tooth 
longer than the lower one. Third segment of abdomen more 
prominent, and running more to a point. Colour brown, 
blotched with a darker or claret colour. Length 3-lths of 
an inch. 
