VI. Pyrgocystis. 



1915 49 



VI. Pyrgocystis n.g. 

 [Part II.] 



[Geol. Mag., n.s., Dec. VI, Vol. II, pp. 49-60; Feb., 1915.] 



C. Pyrgocystis ansticei n.sp. and others. (Plate III, 

 Figs. 3-15.) 



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, 

 Afd. 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 Lindstrom, 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 certaintj' distinguish the following seven species : — 



S. sulcatum, p. 



13, fig. 11, 



Bed c, 



Djupvik, 



abundant. 



S. varium, p. 



15, figs. 12-14, 





i > 



1 specimen. 



S. granulatum, p. 



16, figs. 20-22, 





i » 



3 



S. „ ? p. 



17, 



? > 



Wisby, 



some ,, 



S. strobiloides, p. 



17, figs. 17-19, 



1 J 



Mulde, 



1 



S. proceruni, p. 



18, fig. 15, 





Wisby, 



? 



i > 



s. 





J » 



Djupvik, 



9 



S. fragile, p. 



19, fig. 10, 



? ) 



(horizon not 



( Djupvik, 

 ( Wisby, 



3 



S. cylindricum, p. 



18, fig. 16, 











stated) , 



Wisby, 



1 



In 1906 Colonel [now] Sir J. Arthur Anstice, K.C.B., a son of the 

 Mr. John Anstice of Madeley whose collection was mentioned by 

 Murchison and Prestwich, presented to the British Museum various 

 fossils from the Coalbrookdale district; and among them were 14 

 specimens of the same character as those described by Aurivillius, and 

 like them coming from the Wenlock Shale. Consequently they were 

 at first placed provisionally among the Cirripedia. When, however, 

 Professor Moberg's recent memoir (1914) led us to look through our 

 Palaeozoic cirripedes, Mr. T. H. Withers directed my attention to 

 these fossils. Immediately close examination under the lens revealed 



F 



