42 FOSSIL CIRRIPEDIA. 



Affinities. This species is related to S. trUineatum, simplex, and soUdulum, in the 

 absence of intra-paiietes ; in the terga it comes closest to the latter species.^ 



' 12. SCALPELLUM SOLIDfLUM, Tab. I, fig. 8. 



PoLLiciPES soLiDULus. Steetistrup in Kroyer's Tidsskrift, b. ii (1839), pi. v, fig. 14 et 14*. 



UNDULATUS. Id. Id. Id. fig. 6. 



S. vaharum lineis latiusculis elevatis ab apiee radiantibus. Carina parte superiori libere prominente, 

 et crista centrali, internet, longitiidinali instructd. 



Valves with rather wide elevated lines radiating from their apices. Carina, with the upper part freely 

 projecting, and internally urnished with a central prominent, longitudinal crest. 



Scania (Kjuge). Mus. Univers. Copenhagen. 



Professor Steenstrup has described under this name some carinse, in so worn a condition, that I confess 

 that I thought it quite impossible to characterise them ; and under the name of P. undulatus, some well- 

 preserved terga. Quite lately, M. Angelin has sent to Professor Steenstrup, from Kjuge in Scania, several 

 of the same carinte in a much better condition, a scutum, and some broken terga of P. undulatvs, which, 

 from the similarity of their longitudinally striated surfaces, M. Angelin believes belonged to the same 

 species : I quite concur in the probability of this view. The better state of the carinse proves the sagacity 

 of Professor Steenstrup, in considering his worn specimens indicative of a distinct species. Had I seen 

 these carinse alone, I should have much hesitated in considering them as belonging to a Scalpellum : for 

 they differ considerably from the same valve in all other species ; the parietes, or rather the part answering 

 to the parietes, being here so much inflected, that they fill up and render solid the upper part of the valve ; 

 but the scutum undoubtedly belonged to a Scalpellum, and the terga closely resemble the same valve in the 

 S. arcuatum. 



Carina (fig. 8, b, c, d) ; narrow, elongated, strong and solid ; moderately bowed inwards ; basal margin 

 rectangularly pointed ; surface covered with rather broad slight ribs, central one being apparently (for the 

 best specimens are much worn) twice as broad as any of the others. In a transverse line, the tectum is 

 considerably arched in the upper part of the valve, and only slightly arched in the lower part. A considerable 

 length of the upper part must have projected freely ; this portion being filled up solid, and having a central, 

 largely prominent crest or ridge : it appears, for the specimens are in a much worn condition, as if the 

 ridge had been formed by the inflection of the parietes on each side, and their perfect junction. In the 

 peculiar and almost monstrous variety of S. maximum, called var. cylindraceum, we have nearly the same 

 structure ; a cleft, however, being left, marking the line of junction of the opposite parietes. In general 

 appearance and proportions, this carina comes nearest to those of Scalpellum ; but in the peculiar modi- 

 fication of the parietes (if they can be so called) into a central crest, and in the apparent (from worn state) 

 absence of any distinct ridge separating the tectum and parietes, the valve departs from the general 

 description of the carina in Scalpellum. 



Scutum : of this valve, which undoubtedly belonged to a Scalpellum, there is one entire specimen, 

 but with the angles so much rounded, that I can point out no distinguishing character from the same 

 valve in S. arcuatum (fig. 7, y), of which a figure has been given, except that the longitudinal ridges 

 are proportionally broader and further apart. The ridges closely resemble those on the above-described 

 carina. 



Terga (fig. 8, a) ; sub-triangular, flat, strong, and thick, with moderately wide, not quite straight ridges, 

 radiating from the apex : the interspaces betwen the ridges are three or four times as wide as the ridges 

 themselves ; valve very slightly depressed, parallel to the occludcnt margin. A slight ridge, connecting the 

 sharp basal apex, runs quite close to the carinal margin, even in the lower part of the valve : in 



