F. R. Coivper Reed — Salier'n Undescribed Species. 123 



the Fletclier Collection. There is no other specimen of this species 

 in the Woodwardian Museum. Salter calls it " a new square species." 

 Diagnosis. — Shell forming a regular four-sided elongated pyramid. 

 Sides equal, flat, except near aperture, where the middle of each face 

 is slightly impressed, causing transverse section of aperture to be 

 slightly quadrilobate. Transverse section below aperture square. 

 Angles of pyramid marked by narrow groove. Aperture with 

 margins infl.ected ; lips of anterior and posterior faces large, semi- 

 circular, meeting in middle line ; lips of lateral faces smaller, not so 

 much infolded, not meeting in middle. Apex wanting, being broken 

 off at transverse diaphragm. Faces of pyramid ornamented by 

 50-60 fine raised transverse ribs, angulated upwards along median 

 line at obtuse angle of about 140° and set with small sharp equidistant 

 tubercles, giving a moniliform appearance. The interspaces between 

 the ribs are broad, flat, and smooth. The ribs of the adjacent faces 

 are seen to alternate at the angles. There are 5 or 6 of these ribs on 

 the anterior and posterior lips of the mouth, but only 1 or 2 on the 

 lateral lips. There is no median longitudinal line down the centre 

 of each face of the shell, nor any longitudinal ornamentation. 



Measurements. 



Apical angle ... ... ... ... ... ... 20° 



Rate of tapering ... ... ... ... ... 1 in 3 



"Width at mouth 5 mm. 



Length (minus apex) ... ... ... ... 13 "5 mm. 



Eemakks. — This species belongs to Holm's ^ group MoniliferoB of 

 the genus Conularia, and shows many points of resemblance to the 

 species C. monile (Lindstrom),- but in the British form the tubercles 

 on the transverse ribs are smaller, situated further apart, and not 

 laterally compressed, and the ribs on which they are set are not 

 placed so close together. 



Conularia bifasoiata, Salter. (PI. VI, Figs. 2, 2a.) 



1873. Conularia bifasoiata, Salter MSS. : Cat. Camb. Sil. Foss. Woodw. Mus., 



p. 171 {a 926). 

 1891. Conularia bifasoiata, Woods: Cat. Type Foss. Woodw. Mus., p. 119. 



There is only the original specimen (a 926) of this species in the 

 Woodwardian Museum. It comes from the Lower Ludlow beds of 

 Leintwardine, and on the same slab are numerous specimens of 

 Monograptus leintwardinensis. Salter says of this specimen, " only 

 shows one face, and that of a young specimen." The thin shell is 

 covered with irregular wrinkles owing to unequal compression. 



Diagnosis. — Shell large, pyramidal, apical angle 25°, of extremely 

 thin substance. Surface marked by one small, straight, narrow 

 median ridge, running longitudinally down the centre of the face. 

 On each side of this ridge is a nearly parallel, narrow, dark line 

 representing an internal septum. These two septa are straight and 

 nearly parallel to each other, only slightly diverging in their course 



1 Holm, Sver. Kamb. Silur. Hyolith. o. Conular : Sver. Geol. Undersoka., ser. c, 

 No. 112 (1893), p. 154. 



2 Lindstrom: Sil. Gastrop. Pterop. Gotl. (1884), p. 44, pi. i, figs. 9-12. 



