494 Dr. Senry Woodward — Cretaceous Crustacea, JDenmark. 



The carapace in outline is of a rounded pentagonal form, with its 

 greatest breadth a little anterior to the middle ; of nearly the same 

 length as breadth (1 : 1-1) ; very convex, particularly anteriorly, the 

 posterior part being flatter and often having a depression in the centre. 

 In size it varies from a breadth of a few millimetres up to 40 mm. ; 

 generally it is from 20 to 25 mm. The rostrum (B.) is strongly 

 depressed; the orbits (0.) are deep; their inferior Ijorder forms 

 a blunt process with two teeth. The antero-lateral margin 

 commences with a sharp tooth somewhat below the inferior orbital 

 border ; in other respects the lateral margins agree generically. 

 The posterior margin is sometimes short and much curved, in 

 others long and less curved ; this is probably due to difference 

 in sex. The occipital and lateral sulci or furrows are deep and 

 sharply defined ; somewhat broader on the superior surface than on 

 the curved part. On the inner half of the anterior branchial regions 

 there runs parallel to these a much shallower middle sulcus, which 

 forms a right angle externally and ends in the lateral furrow (on 

 some specimens there are ti'aces of such a curved furrow going off 

 anteriorly towards the occipital or cervical furrow). The epigastric 

 lobes form two pointed eminences. The mesogastric lobe is well 

 defined, and elevated posteriorly. The protogastric lobes are not 

 so well defined in this type. The urogastric lobe is characterized 

 by irregular eminences. Between this and the cardiac region there 

 is a saddle-like depression, the anterior part of which, towards the 

 sides, blends with the above described middle sulcus. The centre 

 of the cardiac region is more or less elevated, and anteriorly it is 

 externally defined by the branchio-cardiac furrow, which on some 

 specimens is shallower, and runs forwards and outwards and unites 

 with the occipital or cervical furrow. The superior surface is 

 ornamented with granules varying in size, which become less 

 posteriorly and are not so well defined (except on the nearly smooth 

 sulci). The inferior surface has granules only on its anterior part. 



The above described details are readily seen on all decorticated 

 specimens and are present on even very small specimens ; on larger 

 and older examples they have often been more or less obliterated. 

 Specimens with the surface of the shell well preserved are not rare ; 

 the granules in these are very distinct, and do not diminish in size 

 posteriorly, and are seen also on the arched part of the carapace. 



Bromiopsis rugosa is not only without doubt one of the most 

 common decapods of the Faxe Chalk, but also generally one of its 

 most common fossils. 



Of this little varying type Segerberg records having found the 

 following different forms (see PI. XII, Figs. 4a-c, x 2 nat. size). 



(a) Forma inflala, small, more strongly and more uniformly arched, 

 with the regions less markedly distinguished ; several specimens. 

 (Segerberg, op. cit., 1900, pi. i, fig. 10.) 



(/3) Forma angusta, small, strongly arched from side to side ; 

 somewhat longer than broad, quickly tapering behind the occipital 

 furrow towards the very short posterior margin. The posterior 

 part of the mesogastric lobe separated by a well-marked sulcus from 



