100 DEVONIAN FAUNA. 



N. pUcata, Phillips,^ has a terminal umbo and more quadrate shape ; and I 

 expect will prove to be a Cypricardinia, perhaps identical with C. scalaris, 

 Phillips, sp. 



2. Ctenodonta (PALiEONEiLo) LiRATA, PMlUps, sp. Plate XII, figs. 12, 13, 13 a; 



and Plate XIII, figs. 1—4. 



1841. PuLiiASTEA ANTiQTJA, Phillips (uot Sowerhy). Pal. Toss., p. 35, pi. xvii, 



figs. 55 a, h. 

 1843. Sanguibtolabia LiEATA, P7«7Z«ps. Pal. Foss., p. 136, pi. Iviii, figs. 53*a, Zi. 

 P1884. Pal^oneilo beevis, Beushausen. Abhandl. Geol. Specialk. Preusa., Band 



vi, pt. 1, p. 79, pi. iii, fig. 13. 



Description. — Shell rather small, suboval, convex, transverse, nearly twice as 

 long as high. Umbo small, low, proximate, rather sharp, without a clavicular 

 process, curving somewhat forward, and situated at or about the anterior third of 

 the length. Anterior margin broad, very convex. Inferior margin long, gently 

 convex, indented behind. Posterior margin very narrow and convex. Hinge- 

 line nearly as long as the shell, slightly bent at the umbo, nearly straight, bearing 

 in front of the umbo about ten small, short, obliquely vertical teeth which increase 

 in size anteriorly, and in rear of the umbo more than thirty-seven still smaller 

 teeth which increase in size posteriorly. Surface covered by twenty or thirty very 

 distant, sharp, erect, very elevated threads, between which several minute minor 

 striae are sometimes apparent, and which are usually regular over the whole valve, 

 but fold into each other as they curve in on the hinge-margin. Contour convex, but 

 with a broad and shallow concave depression, between two slight convex radiating 

 swellings, running from the rear of the umbo to the posterior end of the inferior 

 margin. Lunule deep, ovate, undefined. Shell-structure thin. Muscular scars 

 large, oval, situate respectively at the anterior point, and just under the posterior 

 end of the hinge-line. Pallial line simple, rather distant from the margin. 



Size. — A large valve from Saunton measures 29 mm. in length, 19 mm. in height, 

 and 6 mm. in depth. 



Localities. — In the Barnstaple Athenasum are two specimens from Saunton, 

 four from Bradiford, two from Croyde Bay, and one from Top Orchard. In the 

 Woodwardian Museum are two poor specimens from west of Saunton Court. In 

 the Museum of Practical Geology are Phillips's type specimen of the species from 



1 1841, Phillips, ' Pal. Foss.,' p. 38, pi. xviii, figs. 63 a, h. 



