new anJ rare Crustacea from Scotland. 55 



Pscudowestwoodia pygma;a, sp. n. (PI. VI. figs. 8-lG.) 



Descrijjti'on of the Species. — Female. Lengtli "4 inillim. 

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

 general appearance, but smaller. Anterior anteiinaj short, 

 seven-joiiitiHl ; the iirst two basal joints are moderately stout, 

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

 shorter than the others, as siiown by the formula — 



Proportional len<jrtlis of the joints, . 



1 -2 A 2^1 1.4.4 .5.8 

 Number of the joints 1 2 '6 4 5 6 7' 



Posterior antennas slender and similar to those of Pseudo- 

 westwoodia Audrewi\ T. Scott*. The basal joint of the 

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

 are very short and are furnishe<l with several setw. The 

 niaxilUe 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 jiroccsses are subequal in length and 

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

 furnished with several small setffi ; the two inner processes 

 are also armed with an elongate slender spine (rig. 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 

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

 oi Pseudovestivoodia 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 the 

 length of the other and fully 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- 

 westivoodia Andrewi {i\'^. 14). Fitth pair small ; the basal 

 joint has a somewhat semicircular outline, but the width is 

 greater than the length, and the inner portion is scarcely 

 produced beyond the base of the secondary joint ; there are 

 five stout setai arranged round the tlistal part of the margin, 

 the middle seta being consiilerably longer than the others ; 

 the exterior angle of the basal joint extends into a narrow 



♦ See 'Twelfth -Annual Report of the Fishery Board for Scotland/ 

 part iii. p. 257, pi. ix. fi-rs. 21-29. 



