424 Notes on the Crustacean Fauna of the English Italics. 



structure, as represented in Fig. 5. In the typical form of 

 L. sphcericus, on the other hand, the surface is regularly, but 

 faintly reticulated, as shown in Fig. 6. This is most plainly 

 seen in young specimens, but in older examples is often visible 

 on the margins only, while the margins of the valves in the 

 variety favosus are always, as has been said, quite destitute of 

 sculpture. Length one fifty-eighth of an inch. 



This form occurred plentifully in some small peaty pools on 

 Eskhause, at an elevation of about 2000 feet. The peculiarities 

 of shell sculpture lead me to suspect that it may be a distinct 

 species, though it must be confessed that in other respects 

 there is little or nothing to distinguish it from L. sphcericus. 



Euetceecus lamellatus (Miiller) is common in all the low- 

 lying lakes, but does not apparently inhabit those of great 

 altitude. The only tarns in which I have found it being 

 Langdale (340 feet) and Easdale (915 feet). 



EXPLANATION OE PLATE. 



Fig. 1. — Lynceus barbatus, nov. sp., female, X 84. 

 Fig. 2. — Abdomen of the same, x 210. 

 Fig. 3. — Lynceus sphcericus, var. favosa, female, X 84. 

 Fig. 4. — Abdomen of the same, X 300. 

 Fig. 5. — Exuvium of left valve, showing sculpture, X 84. 

 Fig. 6. — Marginal reticulations of Lynceus sphcericus, X 210. 

 Fig. 7. — Lynceus globosus, female, X 50. 

 Fig. 8. — Lynceus elongatus, female, multivalvular form, 

 X50. 



Fig. 9. — Daphnia Jardinii, female, X 25. 

 Fig. 10. — Abdomen of the same, X 40. 



