346 Dr. H. Woodward — Cirripedes from Trimmingham Chalk. 



margin, a rather broad, somewhat hollow zone. The surface is 

 marked by four or five ribs of unequal distance apart ; the 

 carinal margin is the narrowest, and is slightly curved inwards; 

 the broadest areas have a longitudinal depression between them. 

 (In the Trimmingham specimens these longitudinal lines are very 

 faint indeed, the horizontal lines being the strongest.) The basal 

 margin is the broadest, the lines of growth run parallel to it and 

 across the longitudinal stria3 ; these latter give to the carinal latera 

 a somewhat similar ornamentation to that of the scutum and tergum." 



Passing over BrachyJepas cretacea, previously described (see ante, 

 p. 337), it will be seen from the foregoing account that Brachi/lepas 

 (PolJicipes) fallax is the most important of the Cirripedes from 

 Trimmingham, and the one about which the largest amount of 

 evidence has been obtained as to its various valves. This species 

 also occurs in Maestricht and Riigen, probably also in Denmark, in 

 Hanover, and in Saxony. 



Those wliich follow are mostly represented by single detached 

 valves, and, although deserving notice, are of less interest to the 

 biolosrist. 



/ \;'. ■' 



Fig. 2o. 

 Fig. 26. 

 Fio. 27. 



TolUcipes Angelini, Darwiu. 



(Dr. A. Rowe's Coll.) 

 Ditto. Right terfj^iiiu. Chalk, 



(Mr. Bryilouo's Coll.) 

 Ditto. Lett tersjum. x 2 nnt. size 



Scutum. X 2 nat. size. Chalk, Norwich. 



Trimmiu?ham. 



X 2 uat. size. 



Ditto. Ditto. 

 PoLLiciPES Angelini, Darwin, 1851. 



Pollicipes Angelini, Darwiu, Mou. Foss. LepadiJie : Pal. Soc, vol. v (1861), p. 56, 

 tab. iii, lig. 7. 

 This form is represented in Darwin's monograph by a scutum and 

 tergum from the Upper Chalk of Norwich (Mus. Fitch) ; it occurs 

 also in the Chalk of Scania. I have referred to this species six 

 separate terga, three only fairly preserved, the others very imperfect, 

 and one scntnm, the former all from Trimmingham ; the latter is 

 from Thorpe, Norwich, ex Dr. Arthur Eowe's collection. 



Tergum. — The largest complete tergum (which has been broken 

 and mended) (Fig. 27) measures 22 mm. in length by 13 mm. in 

 breadth at its widest angle. In general outline it is rhomboidal, the 



