546 TRITICELLID^. 



cell, the dorsal outline of which (when viewed sideways) 

 is very slightly curved outwards, and presents no abrupt 

 convexity at any part. The opposite or front side, from 

 the lower extremity of the area (where there is usually 

 more or less of an angular projection) upwards, is some- 

 what flattened. When viewed in front, the cell presents 

 a very regular figure, attenuated below, slightly enlarged 

 towards the centre, and above it narrowing off very gra- 

 dually towards the truncate top. From T. Boeckii, Sars, 

 the present species differs in the more regular shape and 

 slenderer proportions of the zooecium, and in the size and 

 position of the frenaculum, which is placed much nearer 

 the base of the cell than in the first named. On the 

 average, too, the peduncle seems to be much longer 

 in T. Boeckii than in T. Korenii ; but there is much 

 variability in this character. The frenaculum in this 

 species is very inconspicuous, and may readily escape 

 observation. 



As T. Boeckii may probably occur on our I^ig- ^-' 

 coasts, an outline of its cell is given, taken ^ 



from one of Sars^s excellent figures (wood- 

 cut, fig. 32) . 



Habitat. On various Crustacea, from 

 tide-marks to very deep water. 



Locality. Shore of Kerrera Sound, 

 near Oban, on Sacculina carcini (A.M. N.). 



Geographical Distribution. Near Ber- 

 gen, in 120 fathoms, on the carapace of 

 Calocaris Macandrei, Bell; Bohuslan, on 

 the same (G. O. Sars). 



Triticclla Boeckii, 

 Sars. 



