THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE V. VOL. II. 



No. Ill — MARCH, 1905. 



OK,ia-iz^.A.Xj j^K,a?icijES. 



I. — Sedgwick Museum Notes. 



New Fossils from the Havekfoedwest District. III. 



By F. R. CowPER Reed, M.A., F.G.S. 



(PLATE IV.) 



Family HAEPEDIDtE. 



Harfes sp. (PL IV, Fig. 1.) 



IN Mr. Turnbull's collection from the Sholeshook Limestone of 

 the Sholeshook Eailway Cutting there is a small but perfect 

 ' horse-shoe ' limb of a species of Marpes — a genus which has not 

 been previously recorded from this bed. The ' horse-shoe ' is oval 

 and rather elongate, and narrow in proportion to its length; the 

 arms curve inwards gently, so that their acutely pointed posterior 

 extremities are approximate. There seems to be a marginal, single 

 row of large pits round the outer edge of the flattened limb, but the 

 general surface is covered with very minute punctae. The inner 

 edge of the limb is not well preserved. The arms extend backwards 

 to about twice the length of the head-shield. 



Dimensions. mm. 



Width of horse-shoe 7 



Length of ditto ... ... ... 11 



"Width of arms 3 



Eemarks. — This form has a more elongate horse-shoe, with the 

 arms more curved inwards, than IT. Wegelini, Angelin,' but this 

 difierence in shape may be more or less due to slight distortion in 

 our specimen. 



The genus is perhaps represented also in the Slade Beds. 



Family TEINUCLEID^. 



Ampyx cf. rostratus, Sars. (PI. IV, Fig. 2.) 



It is not absolutely certain if the species A. rostratus, Sars,^ really 

 occurs in the British Isles, though it has frequently been quoted, 



1 Schmidt: Rev. Ostbalt. Silur. Trilob., Abth. iv (1894), p. 69, t. v, figs. 10-18. 



2 Sars : in Isis (1835), p. 334, t. viii, figs. 3a-e. 



DECADE V. VOL. II. — NO. III. 7 



