58 On some new and rare Crustacea from Scotland. 



terer Maxlllarfuss schmachtig, mit einem Greifhaken versehen. 

 Furcalanhange beim $ und ? verscliieden gestaltet. Zvvei 

 Eiersacke." 



Tkalestris viysis, Glaus. 



This very distinct species was during the last summer 

 observed by us for the first time in the Firth of Forth. The 

 large foliaceous fifth pair of swimming-feet are closely and 

 obliquely striate, the striaj being quite distinct. Tkalestris 

 mijsis appears to be comparatively rare in Britain ; there are 

 few Scotch records for it, and its occurrence in the Forth is 

 thereibre of interest. 



EXPLANATION OF THE PLATES. 



PLiTE V. 



LeptopsyUui intennedlus, sp. u. 



Fit/. 1. Female, seen from the side, X 80 (A, front view of ovisac). 



2. Anterior antenna, X 500. 3. Posterior antenna, X 500. 



4. Mandible and palp, X 500. 5. Foot of first pair of swim- 

 minjr-feet, X 380. 6. Foot of second pair, x 380. 7. Foot of 

 fourth pair, X 380. 8. Fifth pair, female, X 253. 9. Fifth 

 pair, male, X 253. 10. Abdomen and caudal stylets, dorsal 

 view, X 80. 11. Male spermatophore, X 380. 



Mesochra spinicauda, sp. n. 



Fiq. 12. Female, seen from the side, X 80. 13. Anterior antenna, female, 

 X 380. 14. Anterior antenna, male, X 380. 15. Posterior 

 antenna, X 380. 16. Mandible and palp, X 380. 17. Maxilla, 

 X 380. 18. Anterior foot-jaw, X 380. 19. Posterior foot-jaw, 

 X 380. 20. Foot of first pair of swimmino-feet, x 380. 

 21. Foot of fourth pair, X 380. 22. Foot of fifth pair, female, 

 X 380. 23. Foot of fifth pair, male (A, appendage to first 

 abdominal appendage), X 380. 24. Abdomen and caudal 

 stylets, dorsal view, x 80. 25. Male spermatophore, X 380. 



Mesochra Maclntoshi, sp. n. 



Fig. 26. Posterior foot-jaw, X 760. 27. Abdomen and caudal stylets, 

 dorsal view, X 80. 



Plate VI. 



Mesochra Maclntoshi, sp. n. 



Fig. 1. Female, seen from the side, X 80. 2. Anterior antenna, X 253. 



3. Posterior antenna, X 253. 4. Mandible and ])alp, x 380. 



5. Foot of first pair of swimming-feet, X 383. 6. Foot of fourth 

 pair, X 253. 7. Foot of fifth pair, x 380. 



Pseudoicesticoodia pygmcea, sp. n. 

 Fig. 8. Female, seen from the side, X 80. 9. Anterior antenna, x 380. 



