444 F. R. Cowper Reed — Fossils from Haverfordwest. 



DiMORPHOCEKAS DISCREPANS (T. BrOWn^). 



In one nodule is exhibited about one-half of the lateral area and 

 a portion of the periphery of the septate part of a Goniatite, 3 mm. 

 in diameter, that seems to be referable to this species. The test is 

 not preserved, but the septa are well shown. 



Orthoceras, sp. 1. 



In the same nodule as the example of Dhnorphoceras discrepans 

 there is a fragment of a slender, slowly-tapering Orllioceras, 8 mm. 

 long and about 2 mm. in diameter. Eather more than the upper- 

 most 2 mm. form part of the body-chamber ; the rest is entirely 

 septate and exhibits fifteen chambers, so that these may be described 

 as very shallow, about five occupying the space of 2 mm. The septa 

 are slightly oblique ; the cross-section is elliptical ; the siphuncle 

 appears to be nearly marginal and situated at the extremity of the 

 long axis. The test is thin and polished. Orthoceras asciculare, 

 T. Brown,- is described as having the siphuncle near the side, but, 

 judging from the figure, that species has deeper chambers than the 

 present specimen. 



Orthoceras, sp. 2. 



Another nodule contains a fragment of a slender Ortlwceras, about 

 6 mm. long. The specimen is only partially exposed, the greatest 

 width being only 1-5 mm., but it seems to belong to a more rapidly 

 tapering shell than sp. 1. Although nearly covered with the test, it 

 appears to be entirely septate, the chambers being a little deeper 

 than in sp. 1, eight chambers occupying about 5 mm. The test is 

 thin, polished, and has very feeble annulations, which apparently 

 correspond to the septa, whilst the surface between the annulations 

 is covered with exceedingly fine transverse lines. 



III. — Sedgwick Museum Notes. 

 New Fossils from the Haverfordwest District. IV. 



By F. E. Cowper Eeed, M.A., F.G.S. 



(PLATE XXIII.) 



rpHE following species of Brachiopoda were recorded by Messrs. 



X Marr & Roberts ^ from the Ordovician beds of the Haverfordwest 



■district : — 



Llandeilo Limestone. 



Leptana \_Plectamhonites] sericea, Sow, 

 Orthis striatnla, Conr. 



DlCRANOGRAPTUS ShALES. 



Orthis argentea, His. 

 Siphonotrcta micula, McCoy. 



aud " other horny brachiopods." 



' T. Brown, Fossil Conchology, 1849, p. 28, pi. xxi, figs. 8, Sa, and 15 [Goniatites 

 discrepans). See also Foord & Crick, Cat. Foss. Ceph. British Museum, pt. 3, 1897, 

 p. 222 (Dimorp)hoceras discrepans). 



2 T. Brown, Trans. Manchester Gaol. Soc., vol. i, 1841, p. 220, pi. vii, fig. 39; 

 and T. Brown, Foss. Conch., 1849, p. 249, pi. xxix*, fig. 29. 



3 Marr & Roberts: Q.J.G.S., vol. xli (1885), pp. 476-491. 



