12i 



spine) a very acute angle with the surface of the carapace ; this 

 angle becomes larger farther back until at the last side-spines 

 it is about 90°, and near the posterior margin it gets still larger. 

 The pterygostomial furrow, which is very distinct, starts from 

 the innermost infra-orbital spine , and runs from thence in a 

 slightly S-shaped line towards the posterio-lateral margin which 

 it almost reaches at a point situated a little behind the hind- 

 most spines of the posterio-lateral margin, then it runs parallel 

 with the latter at a short distance from it, down to the posterior 

 margin. The inner margin of the branchiostegites is thickened, 

 and during its whole length accompanied by a furrow. 



I have only an imperfect knowledge of the epistoma. It 

 seems to consist of a long cross-beam the ends of which are 

 bent somewhat upwards, and enclose the basal-segments of the 

 inner antennae. From the middle of the epistoma a narrow 

 projection runs at right angles up towards the front; it sepa- 

 rates the basal-segments of the two inner antennae. 



Nor have I seen the endostoma in a good state of preserva- 

 tion. As far as can be seen it greatly resembles the endo- 

 stoma of Coeloma holsaticum Stolley. Its highest parts are 

 found on each side of the bottom of the deep incision. 



The basal-segments of the inner antennae are situated just 

 below the front, they are very large, and are separated by the 

 cross-lamella which unites the front with the epistoma. 



The basal-segments of the outer antennae lie close to the 

 inner ones, and are much smaller than these. 



Of the oral appendages 1 have seen the last pair of 

 maxillipeds. They greatly resemble the corresponding pair in 

 the C. holsaticum Stolley; only in the Greenland species the 

 furrow on the head-segment generally seems to be somewhat 

 deeper, and the following segment gets somewhat broader 

 towards the outside. 



Of the other oral appendages I have seen here and there 

 indistinct remains only. 



