242 Kev. Canon A. M. Norman on British Mysidae. 



expanse, subangulato ; apertura obliquo-trigonali ; peristomate 

 simplici. 

 Long. 2*50, lat. 1*75 mill, 



JIab. Zvvartkop {Farquhar). 



This very pretty species is not nnlike the British P. nitidus 



(Miill.). 



EXPLANATION OF PLATE XIII 



JFig. 1. Helix Trimeni. 



Fig. 2. ccenoteru. 



Fig. 3. liparo.vniitha. 



Fig. 4. eumacta. 



Fig. 5. actinotricha. 



Fig. 6. Burmipi. 



Fig. 7. — conisalea. 



Fig. 8. Helix minythodes. 



Fig. 9. — Farquhari. 



Fig. 10. Vitrinafuficicolor. 



Fig. 11. chrysoprasina. 



Fig. 12. pheedimn. 



Figs. 13, 13 a. Planorhis emicans. 



XXIX. — On British Mysidae, a Family of Crustacea Schizo- 

 poda. By the Rev. Canon A. M. Norman, M.A., D.C.L., 

 F.R.S., &c. 



[Continued from p. 106.] 



Genus 7. Leptomysis, G. O. Sars, 1869, 



Eyes subglobose, not compressed. Antennal scale subu- 

 late, ciliated all round, second joint very long- and running 

 out to a narrow extremity. Legs long and slender ; tarsus 

 3-articulated ; a very slender nail. Telson linguiform or 

 lanceolate, of considerable size, margins spined, entire at the 

 extremity, which is aculeated with spines of unequal length. 

 TJropods long and narrow, ciliated on all sides ; acoustic 

 organ large. Pleopods in female one-jointed, small and 

 narrow ; in male well developed, biramose, multiarticulate, 

 natatory ; lateral basal lobe of inner branch small ; outer 

 branch of fourth pair having 1-3 terminal articulations 

 furnished with ciliated spines (instead of setse) . 



1. Leptomysis gracilis^ G. O. Sars. 



1864. Mysis gracilis, G. O. Sars, Beret, om en i Somm. 1863 foretagen 



Zool. Reise i Christiania Stit't, p. 23. 

 1869. Mysis hispida, Norman, " Last Report Dredging Shetland Isles," 



Brit. Assoc. Rep. 1868, p. 267. 

 1869. Leptomysis gracilis, G. O. Sars, Undersogelser over Christiania- 



fjordens Dybvandsfauna, p. 29. 

 1879. Lepto7nysis gracilis, G. O. Sars, Carcinol. Bidi'ag til Norges 



Fauna, I. Monogr, Mysider, p. 31, pis. xix., xx. 

 1882. Leptomysis gracilis, Czerniavskv, Monogr. Mrs. Imp. Ross. fasc. i. 



p. 90, iii. p. 20. 



