NEW MICROSCOPIC ALG.E. 321 



and the animal being so very minute, it is impossible to arrange 

 a dead specimen so as to obtain a good position ; and as any im- 

 proving (?) touches of an artistic character might do more harm 

 than good (by misleading), I prefer representing them as they 

 appeared to me, rather than <' building" a perfect sketch from 

 several specimens separately examined. 



EXPLANATION OF PLATE XVI. (in Part). 



Fig. la, Pachygnathus Seahami, dorsal aspect ; magnified about 60 diameters. 



1^ M „ mandibles, magnified about 250 diameters. 



Ic n i» tip of leg with claws, showing pectinated margin 



magnified 250 diameters. 



2, Zoea oi Portunus depurator, dorsal aspect, magnified 30 diameters. 



3 „ „ the same in profile, magnified 30 diameters. 



^ » 51 head and appendages, with the facetted eyes, 



magnified 100 diameters. 



5 n u one of th3 swimming legs with its setfe mag- 



nified 100 diameters. 



^ >. „ abdominal prolongation, with tail fin, magnified 



75 diameters. 



XXIV. — Remarks on some new Microscopic Algce. Collected by 

 Thomas Atthey. By Tuffen West, F.L.S. (Plate XVI., 

 figs. 7—11). 



Being on a short visit to Newcastle for the sake of health, in 

 December, 1859, I gladly embraced an opportunity of making, 

 in company with my friend H. T. Mennell, a call on T. Atthey, 

 at West Cramlington. We had but a brief v\^inter's afternoon 

 at our disposal, but setting methodically to work succeeded, 

 though the time was so short, in looking over a goodly number 

 of slides, the major proportion of which were preparations of 

 Diatomacea3. Among them were most of the marine forms from 

 the coast of Northumberland, lately found by Dr. Donkin, and 

 described by him in the " Transactions of the Microscopical 



