196 ANCEID.E. 



mens found on a stone brought up whilst haddock-fishing, 

 and females found upon a shell of Limitella communis. 



Mr. Robertson has sent us both male and female speci- 

 mens from the Isle of Man, all taken under dead Balani. 



We were at first disposed to regard our species as 

 identical with the Anceus manticora of M. Hesse's 

 memoir ; but the details which he has given of that 

 species do not agree with those which our specimens 

 present, and which, consequently, induce us to refer 

 the species rather to his Anceus Scarites, pi. iii. fig. 15 ; 

 although we have certainly never seen specimens ex- 

 hibiting the singular marking which he has represented : 

 the large patch in the centre of the three conjoined 

 segments of the body agrees, however, with the males 

 of our species, except that in the latter this patch is 

 only visible on the ventral surface. We believe, also, 

 that our species is identical with the Anceus rapax 

 of Milne Edwards, — as in fact that learned author has 

 suggested, — although in his figure he does not represent 

 the notch on the outer edge of the mandibles. 



