ISotes on the Crustacean Fauna of the English Lakes. 423 



Lynceus globosus (Baird). (Fig 7.) — One of the finest, 

 and by no means one of the commonest of the British species, 

 living always in clear water, where there is abundance of vege- 

 tation, and mostly in situations of no great altitude. In the 

 lake district it inhabits Windermere, Grasmere, and pools in 

 Ennerdale. From a specimen taken in the latter place our 

 figure has been drawn. The shell, when closely examined, 

 after the internal parts of the animal have been removed, is 

 seen to be regularly reticulated throughout, but on the ventral 

 margin the reticulations partially coalesce, so as to form con- 

 centric furrows. In the living state these markings are a 

 good deal obscured, and give rise to an appearance of dotting 

 or scaliness which does not really exist. 



Lynceus barbatus, nov. sp. (Figs. 1, 2). — Carapace sub- 

 semicircular; dorsal margin boldly arched from the postero- 

 superior angle to the extremity of the rostrum, which is long, 

 slender, and acutely pointed, and projects beyond the ventral 

 margin ; ventral margin gently convex, fringed with spiniform 

 hairs which commence about the middle, and gradually increase 

 in length to the posterior extremity, where they end abruptly ; 

 posterior margin slightly angular above, rounded off below; 

 anterior antennas slender, about half the length of the rostrum; 

 abdomen broad and short, superior margin deeply excavated, 

 superior posteal angle produced and obtusely rounded, armed 

 with about nine long and nearly equal spines, terminal claws 

 slender and bearing a single small spine at the base ; eye-spot 

 situated nearer to the eye than to the extremity of the rostrum, 

 and about half its size ; shell devoid of reticulation or striation, 

 but slightly waved round the margin, especially on the dorsum. 

 Length one fifty-fifth of an inch. 



This is a very distinct, and apparently a rare species. I 

 have seen only four specimens, three of which were taken in 

 Buttermere, and one in a pool in Ennerdale. 



Lynceus spk&ricus, Miiller — (Fig. 6) — is found everywhere, 

 from the smallest road-side pool to the most elevated moun- 

 tain tarns, but is most abundant in somewhat foul and stagnant 

 water. 



Var. favosa (Figs. 3 — 5). — Closely allied to the last, 

 and almost exactly similar in shape, except that the rostrum is 

 perhaps somewhat longer and more slender. The markings 

 of the carapace are, however, entirely different, consisting of 

 very deep and conspicuous irregularly angular excavations, 

 which are restricted to the head and the inferior and posterior 

 portions of the carapace. The margins of the valves are 

 always entirely free from these markings, but their distribution 

 over the other portions is somewhat variable, and the parts not 

 thus marked are quite devoid of reticulation, or any perceptible 



