Mr. H. G. Seeley on Zoocapsa dolicliorliampliia. 283 



tion of tlic centrum it resembles the lower dorsal vertebrae of 

 birds. 



I have macte this note, not as a sufficient description of the 

 specimens to which it relates, but in the hope that other parts 

 of this and allied animals may be made available for scientific 

 description by those collectors who possess them, and tliat 

 they will so make known a group of animals as marvellous in 

 size and organization as any Avhich have enriched the records 

 of pala3ontology. With the fossil I would associate the name 

 of my friend l)r. Hulke, chronicling tlie species as Ornithojjsis 

 Hulkei. 



XXXII. — On Zoocapsa dolicliorliampliia, a Sessile Cirripede 

 from the Lias ofLymeRecjis. By Harry G. Seeley, F.G.S., 

 Assistant to Professor Sedgwick in the Woodwardian Mu- 

 seum of the University of Cambridge. 



Among some Lias fossils obtained at Lyme Kegis by Mr. 

 Henry Keeping, for the Woodwardian Museum, was one 

 which exposed a portion of the tergum of a sessile Cirripede. 

 It rested in a hard matrix of calcareous clay, immediately upon 

 a layer of Pentacrinitc-limestone ; and it was not till after 

 some days of dissecting that I had the pleasm-e of laying bare 

 the entire tergum and entire scutum of the oldest known repre- 

 sentative of the group. Every way it is a remarkable fossil : 

 the scutum closely resembles that of the pedunculate Cirri- 

 pede ScaJpeUiDH ; the tergum, by its long beak, recalls certain 

 Balani] while the emargination of its basal border points 

 strongly to another beaked type, Elminius. Yet as it fortu- 

 nately happens that the internal aspect of these opercular 

 valves is exposed, it is manifest that neither valve displays 

 the muscular scars which distinguish the Balanida? ; and herein 

 they resemble the Verrucidge. But since the shape and arti- 

 culation of the valves offer no resemblance to Verruca^ it is 

 open to speculation whether an inner porcellanous layer of 

 shell has disappeared, and so obliterated the muscular impres- 

 sions — a supposition which is, perhaps, su})ported by the scu- 

 tum being rough and cancellate internally, seemingly from 

 reproducing the outside ornament. From the tergum and 

 scutum being in juxtaposition, and these valves being only 

 two in number, there is some support for a Verrucian hypo- 

 thesis ; yet from the articulation of the valves conforming to 

 the straight-hinge type of Balanus^ it is probable that, unless 

 we have here a new family type (as I incline to believe), its 

 place is among the Balanidas. 



