of the Fishery Board for Scotland, 



233 



Genus Graptoleberis, G. 0. Sars. 



Graptoleberis testudinarius (Fischer). 



1851. Lynccus testudinarius, Fischer, Mem. de Lav. etrangers, 



St Petersbourg, vol. vi. p. 191, PL IX. figs. 3-6. 

 1862. Graptoleberis reticulata, G. 0. Sars, op. cit., Andet Bedrag., 



p. 41. 



1884. Graptoleberis testudinarias, Herrick, Crust, of Minnesota, 

 p. 90. 



The peculiar hood-like portion of the carapace that forms the head 

 imparts a distinctive appearance to this species. It was very scarce in 

 the Loch Morar gatherings, one or two specimens only being obtained in 

 bottom material from the head of the loch. 



Genus Alona, Baird. 



Al< ma guttata, G. O. Sars. 



1862. Alona guttata^ G. 0. Sars, op. cit., Andet Bidrag,, p. 38. 



This Alona was one of the more common of the smaller species in the 

 gatherings of bottom material. The carapace viewed laterally is sub- 

 '(iiadrilateral in form, and the surface of the carapace is usually ornamented 

 by being thickly covered with puncture-like markings. By means of the 

 form and sculpture of the carapace the species is readily distinguishable 

 among its more common associates. 



Alona costaia. G. 0. Sars. 



1862. Alona costata, G. 0. Sars, op. cit., Andet Bidrag., p. 38. 



In the same material with the last, but ' much scarcer. This species, 

 though somewhat like the last, wants the peculiar puncture-like markings ; 

 it is rather longer in proportion to the breadth, and there are usually 

 impressed parallel longitudinal lines observable on the carapace. 



Alona guadrangularis (Miiller). 



1776. Lynceus guadr angular is, Midler, Zool. Dan. Prod., p. 199, 

 No. 2393. 



1850. Alona quadrcmgidaris, Baird, Brit. Entom., p. 131, PI. 

 XYI. fig. 4. 



In the gatherings of bottom material, but not very common. 



Genus Alonella, G. 0. Sars. 



Alonella exigua (Lilljeborg). 



1853. Lynceus exiguus, Lilljeborg, De Crust, in Scenia, p. 79, PI. 

 VII. figs. 9-10. 



This is a very small species — rather less than the y^th of an inch — but 

 distinguishable by the broadly ovate form of the carapace, and the 

 distinctly toothed posterior angle of the front margin. It appeared to be 

 a scarce species. 



Alonella, nana, (Baird). 



1843. Acroperus nanus, Bainl, Ann. and Mag. Nat. Hist., vol. ii. 



p. 92, PI. III. fig. 8. 

 1862. Alonella pygmaea, G. 0. Sars, op. cit., Andet Bidrag., p. 52. 



This was also apparently a rare species, but from its small size — less 

 than the x^o-th of an inch — it is easily overlooked. It is readily 

 distinguished by the beautiful sculpture of the shell. 



