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 Crail 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 3-4ths of 

 an inch. 



