Portal de Periódicos da CAPES

I.—Studies in Edrioasteroidea. VI. Pyrgocystis n.g.

1915; Cambridge University Press; Volume: 2; Issue: 2 Linguagem: Inglês

10.1017/s001675680017743x

1469-5081

F. A. Bather,

Mollusks and Parasites Studies

Previous History .—In 1892 Professor Carl W. S. Aurivillius published his well-known paper “Ueber einige ober-silurische Cirripeden aus Gotland” (Bihang Svenska Vet.-Akad. Handl. Bd 18, Aid. IV, No. 3). Besides the remarkable specimen from the Ludlovian Pterygotus bed of Wisby, to which he gave the name Pollicipes signatus , and a supposed fragment of a scutum, which he called P. validus , Professor Aurivillius described a number of “kurze, mehr oder weniger cylindrische, mit Schuppen bedeckte Bildungen”, which he regarded as the peduncles of a cirripede and referred provisionally, in the absence of any trace of a capitulum, to Scalpellum . Though all the specimens (except possibly of S. cylindricum ) came from a single stratum, bed c of Lindström, probably contemporaneous with our Wenlock Shale, and though the majority were found in a single locality, Djupvik in Eksta, still Professor Aurivillius considered that he could with certainty distinguish the following seven species: