172 BRITISH ENTOMOSTRACA. 



Dredged in from eighty to ninety fathoms of 

 sand ; twenty miles east of the Noss in the Shetland Isles ; 

 R. M'Andrew, Esq. 



9. CYTHERE INOPINATA. Tab. XX, figs. 1, 1 a-e. 



CYTHEKE IXOPINATA, Baird, Zoologist/i, 195, f. a, b ; Trails. Bcrw. 



Nat. Club, ii, 153. 



Shell oblong ovate, nearly of equal size at each ex- 

 tremity ; white, with a slightly orange-coloured mark on 

 the upper edge; transparent, smooth, and shining ; perfectly 

 free from hairs, but possessing a few short, spinous pro- 

 jections on the lower margin of the posterior extremity. 

 Each valve has a gibbous projection about the middle, 

 which is best seen when the animal is lying on its back, 

 and is sinuated on the interior margin. 



The superior antennae (f. 1 b] are composed of five (?) ar- 

 ticulations, and furnished with several rather short seta'. 

 The inferior or pediform antennas (f. 1 c) are provided with 

 a stout, jointed seta. This species is very small, and from 

 this circumstance and its always creeping at the bottom, 

 is easily overlooked. 



This is the second species only that has as yet been 

 found inhabiting fresh water, Mr. Say having previously 

 described one as occurring in Georgia and Mast Florida. 

 See ' Journ. Acad. Nat. Sc./ Philad. 1817. 



Hab. The only place I have ever found this species is 

 in a small pond between llanwell and Soiithall, Middlesex. 



10. CYTI-IEUE AN GUST AT A. Tab. XXI, fig. 6. 



CYTHEKINA AM.ISTATA, Minister, Julirlmch i'iir Miiirralogie, 1838, 



t.G, f. 10. 



Shell oval oblong, obtuse at cither extremity, narrower 

 anteriorly, and slightly sinuated on inferior margin. It 

 is of a pale yellow colour, and the surface is shining and 

 polished-looking, but when examined by the microscope, 

 it is si-i-n to be eo\ered with small asperities The suit- 

 stance of the shell is lionn -looking and transparent. 

 Alou<: the ddi-sa! margin, on each side, there is a -cries of 



