H Messrs. G. S. Brady and D. Robertson on the 
about fifteen miles to Breydon Water. The western end of 
Lake Lothing has quite a marine appearance, its pes being 
coated with the usual Algæ of the upper littoral zon 
gatherings are from the soft ipe: apa of the channel pa 
low-water mark. The sea was once known, on the occasion 
of an unusually high tide, to freak over the top of the lock 
into Oulton d 
Aa. River Bure near Yarmouth.—hese gatherings were 
from the bed of the river, below low-water mark, the bottom 
consisting of stones and mud. 
Bb. Breydon Water, a large tidal basin which receives the 
waters of the rivers Bure, Yare, and Waveney, is situated to 
the west of Great Yarmouth. It is about four miles long by a 
mile broad, and a large proportion of its surface is left dry at 
low water. Our gatherings extended from Yarmouth to the 
confluence of the rivers Yare and Waveney, and were taken 
both in mid-stream and more or less over the sides. The 
bottom at some ma was coarse sand, at other parts black or 
brownish coloured m 
Cc. River Ouse ( (Norfolk) ) at Lynn.— Muddy sand, from low- 
water margin of the river. Rise at spring-tides eighteen feet. 
Dd. River Scheldt, Antwerp.—* Material a light-coloured 
sand mixed with vegetable remains. It was obtained from a 
sandbank near the town, where the river is a quarter of a mile 
wide. The rise of tide at springs is fifteen feet. Distance from 
the sea about sixty miles.” —Æ. C. Davison 
Ee. River Maas or Meuse, near Schiedam.— Material 
somewhat similar to the last mentioned. A good many years 
have elapsed since I obtained them, and my information is but 
scanty respecting the localities.” —H. C. Davison. 
Genus Crpris, Müller. 
Cypris ventricosa, nov. sp. (Pl. IV. figs. 1-3.) 
Carapace art s female?), as seen from the a“ inis oce 
middle; greatest height equal t 
thirds of "s uc anterior extremi ity virt obtusely, 
peces boldly rounded: superior margin boldly arched, 
ighest in the middle, where it is somewhat gibbous; in- 
ferior almost straight, slightly sinuated, however, in the 
middle, in front of which is a slight convex protuberance. 
Seen from above, ovate, widest in the middle, thence taper- 
ing gradually towards the anterior extremity, which is 
sharply acuminate; posterior extremity well rounded, 
greatest width equal to half the length : end view bro 
oval, nearly circular. Surface of the shell smooth, sparingly 
