neio and rare Crustacea from Scotland. 55 



Pseudoioestivoodia pygmcea, sp. n. (PI. VI. figs. 8-16.) 



Description of the Species. — Female. Length '4 millim. 

 (hV of an inch). Very like Westwoodia nobilis (Baird) in 

 general appearance, but smaller. Anterior antenna short, 

 seven-jointed ; the first two basal joints are moderately stout, 

 the fourth, fifth, and sixth are subequal in length and much 

 shorter than the others, as shown by the formula — 



Proportional lengths of tlie joints . . 1^ . 12 . 11 . 4 . 4 . 5 . 8 

 Number of the joints 12 6 45 6 7' 



Posterior antennae slender and similar to those of Pseudo- 

 westwoodia Andrewi, T. Scott*. The basal joint of the 

 mandible-palp is slender and elongate, but the two end-joints 

 are very short and are furnished with several seta?. The 

 maxillae are small, the distal half is only about half the width 

 of the comparatively broad basal portion, and is armed with 

 several spine-like teeth, while three narrow processes spring 

 from the large notch formed by the sudden contracting of the 

 exterior margin ; these processes are subequal in length and 

 reach to about the middle of the biting part ; they are each 

 furnished with several small seta3 ; the two inner processes 

 are also armed with an elongate slender spine (fig. 10). 

 Anterior foot-jaws small, provided with a strong terminal 

 claw, and also with three narrow processes on the distal half 

 of the inner margin, each of which bears a few small terminal 

 setffi (fig. 11). Posterior foot-jaws somewhat similar to those 

 of Pseudowestwoodia Andrewi, but rather more robust. The 

 first pair of swimming-feet are also similar to those of that 

 species, but the inner branches have the first joint propor- 

 tionally longer and are armed with two stout and elongate 

 terminal spines ; the longest of the two is about twice tiie 

 length of the other and iully half as long as the entire length 

 of the inner branch ; the end-joint of the inner branches has 

 a pseudo-division extending across the middle of it (fig. 13). 

 The second, third, and fourth pairs are nearly as in Pseudo- 

 toestwoodia Andrewi (fig. 14). Fifth pair small; the basal 

 joint has a somewhat semicircular outline, but the widtii is 

 greater than the length, and the inner portion is scarcely 

 produced beyond the base of the secondary joint ; there are 

 rive stout seta3 arranged round the distal part of the margin, 

 the middle seta being considerably longer than the others ; 

 the exterior angle of the basal joint extends into a narrow 



* See ' Twelfth Annual Report of the Fishery Board for ScotUind,' 

 part iii. p. 257, pi. ix. lios. 21-29. 



