16 DEVONIAN FAUNA. 



2. Genus. — Aparchites, Jones, 1889. 

 1. Aparchites Lindstecemi, Jones, var. excellens, nov. var. PI. Ill, fig. 3, 3 a. 



1889. Aparchites Lindstecemi, Jones. Ann. Mag. N. H., ser. G, vol. iv, p. 272, 



pi. XV, figs. 14 a, b. 



Description. — Valve short, ovate, convex. Anterior end subtruncate, rather 

 narrower than the other, which is rounded. Dorsal edge rather short. Ventral 

 margin strongly arched. Surface bearing a small, low tubercle close to the antero- 

 dorsal corner. 



Size. — Length 2 mm., height 1*5 mm. 



Locality. — A specimen from Kingdon's, Shirwel],is in the Barnstaple Athenseum. 



Bemarks. — The figured specimen is embedded in hard limestone, and possibly 

 does not show the true margin all round. Professor Rupert Jones considers it to 

 approach very near to A. ovatus, Jones and Holl, sp.^ It differs, however, from it 

 in being shorter and more evenly convex. A. simplex, Jones, ^ agrees better in 

 these points, but seems more regularly oblong. A. Lindstroemi, Jones,' is almost 

 identical in outline, but is so much smaller and flatter as probably to indicate 

 that our specimen belongs rather to a larger variety than to the described type. 



3. Gemis. — Primitia, Jones and Holl, 1865. 

 1. Peimttia spaesinodosa, n. sp. PL III, figs. 4 — 6. 



Description. — Valve elongate, oval, convex. Dorsal and ventral borders 

 almost straight. End borders rounded. Valve divided by a deep, broad 

 dorsal furrow, sloping down from the centre forward, and separating it into 

 two flatly swollen convexities, each of which bears a tubercle (not distinctly 

 shown in the figure) near the centre of its lateral face, while another small 

 tubercle is on the angle of the anterior lobe, overhanging the furrow. 



Size. — Length "83 mm. 



Locality. — Three specimens are on the slab in Miss Partridge's collection from 

 Saunton Hotel. 



1 1865, Jones and Holl, 'Ann. Mag. N. IT.,' ser. 3, vol. xvi, p. 10, pi. xiii, figs. 13 a — c ; and 

 1891, Krause, ' Zeitsch. Deutscb. Geol. Gesell.,' vol. xliii, p. 492, pi. xxix, figs. 9 a — c. 



2 1889, Jones, ' Ann. Mag. N. H.,' ser. 6, vol. iv, p. 272, pi. xv, figs. 13 a— c ; and 1891, Krause, 

 * Zeitsch. Deutsch. Geol. Gesell.,' vol. xliii, p. 491, pi. xxix, figs. 8 a — c. 



' 1889, Jones, ' Ann. Mag. N. H.,' ser. vi, vol. iv, p. 272, pi. xv, figs. 14a, h. 



