173 



were more properly referable to the form described below as Leptocythere 

 castanea. I think however that Baird had confounded these 2 nearly allied 

 species, and that in reality the specimen originally described by him has 

 belonged to the present species, the figure given of it in his work on the British 

 Entomostraca agreeing much better with this than with the other species. 



Occurence. I have taken this species in several places on the Norwegian 

 coast, from the Christiania Fjord to Finmark. It is not strictly a littoral form, 

 being only found at some depth, in the laminarian zone. 



Distribution. British Isles, Holland, Bay of Biscay, Mediterranean. 



Fossil. Norway, Scotland. 



77. Leptocythere, Macallana (Brady & Roberts.). 



(PI. LXX1X, fig. 2.) 



Cythere Macallana, Brady & Robertson, Ann. Mag. Nat. Hist., ser. IV, Vol. Ill, p. 368, 



PI. XIX, figs 59. 



Specific Characters. Female. Shell, seen laterally, somewhat irregularly 

 oblong subreniform in shape, higher in front than behind, greatest height 

 nearly equal to half the length, dorsal margin well arched in front and sloping 

 obliquely behind, ventral margin distinctly sinuated in front of the middle and 

 gently curved behind, anterior extremity broadly rounded, posterior obtusely 

 truncated, with the upper corner slightly projecting; seen dorsally, narrow 

 ovate in outline, with the greatest width behind and about equal to l /3 of the length, 

 anterior extremity more pointed than the posterior. Valves rather thin and 

 pellucid, with the surface smooth and only indistinctly pitted, but marked with 

 distant very small tubercles, anterior and posterior edges finely hairy. Anterior 

 antennae rather robust, with the first 2 joints of the terminal part comparatively 

 broader than in the preceding species, last joint scarcely longer than the 

 middle one. 



Male. Shell somewhat more elongated than in female and more tapered 

 behind, with the dorsal margin more evenly arched and the upper-posteal 

 corner more projecting. Copulative appendages differing conspicuously from 

 those of the preceding species in the shape of the terminal part, the anterior 

 lappet of which is much shorter and obtusely rounded at the end, whereas 

 the posterior lappet is more produced and pointed. 



Colour light yellowish, with a slight brownish tinge. 



Lenght of adult female 0.50 m., of male about the same. 



Remarks. This is a rather small species, and might, on a cursory view, 

 easily be taken for young of the preceding one. It is however a well defined 



