Cretaceous and Ttrliary Qirn pedes. 197 



1854. PolU'cipes validm, Steeustnip ; C. R. Darwin, Ray 8oc. Monogr. 

 Subclass Cirripedia, 13alanid;e, Synop. et Index Systeinaticits, 



p. mi. 



1854. Mitella valida, Steenstrup, sp. ; J. Bosquet, Monogr. Crust. 

 Foss. du Ducli^ de Limbourg, p. 24, pi. ii. figs. 1-3. 



Diagnosis. Valves strong, the scuta and carina ))eiiig 

 extrernely thick. Scutum elongate and strongly bant 

 towards the terga, with a ridge extending from the apex to 

 a point on the basal margin rather nearer to the rostral 

 angle; occludent margin much thickened, and at the rostral 

 angle the valve is produced into a short blunt tooth. Carina 

 steeply arched transverselj% the greater part projecting 

 freely, and on the inner side either Hat or with a prominent 

 central crest. 



Distribution. Danian : Scania, Sweden. Maestrichtian : 

 Petersburg, near Maestricht. Upper Senonian : Ciply, 

 Belgium. 



Type. This species was founded by Steenstrup (1839) on 

 some carinae and scuta from Scania, Sweden, but among 

 them he figured (pi. v. fig. 30) a scutum of PuUicipes 

 dorsatus. Some of Steenstrup's specimens are preserved in 

 the University of Copenhagen, the carina (pi. v. fig. 29) 

 being in the Zoological Museum, and the two scuta (pi. v. 

 figs. 31-32) in the Mineralogical Museum. I select the 

 original of fig. 32 as the holotype. Darwin (1851) sub- 

 sequently figured a carina and two scuta, and of these the 

 carina (pi. iv. figs. 2 a-d) is in the Zoological Museum, and 

 the scutum (pi. iv. figs. 2 e-f) is in the Mineralogical 

 jMuseum, of the University of Copenhagen. Bosquet (1854) 

 also figured a scutum and carina, with the addition of a 

 tergum, but I do not know where these specimens are. 



Among the Cirripede valves from Ciply (Belgium) in the 

 Geological Department of the British Museum is a rostrum, 

 registered 38460, which must, I think, belong to this species. 

 It differs much from that of P. dorsatus, especially in having 

 the basal margin acutely rounded, and, since the upper 

 margins make a more obtuse angle than in that species, the 

 whole valve approaches more closely to a diamond shape. 

 The ridge extending from below the apex, to the lateral 

 angles on the inner surface differs from that of P. dorsatus 

 in being much less angular. It is quite possible that this 

 rostrum may belong to some other species, but in the absence 

 of any definite evidence I refer it to P. vn/idus. 



Measurements. This rostrum is 7\) mm. long, and its 

 breadth is 7'7 mm. 



