PRIMITIA. 17 



RemarJvS. — These specimens are casts, but show the shape rather clearly ; they 

 evidently had rather thick tests. 



Professor Rupert Jones was inclined to identify these specimens with his 

 Primitia mundula, var. longa} Our specimens, however, on close examination 

 show several distinct scattered tubercles, which do not seem to exist in 

 P. mundula', and, moreover, the sulcus sets forward instead of being nearly 

 vertical, and the shape is more oval. 



Bollia? siiiuata, Krause,^ seems more oval, and the central furrow is more 

 direct, and ends in a circular pit. 



Primitia impressa, Ulrich,^ is relatively shorter and more oval. 



Ulrichia confluens, Ulrich,* is somewhat similarly nodulated, but its furrow is 

 much wider and more ±-shaped. 



The small specimen, fig. 4, appears probably to be a young or indistinctly 

 preserved example of the same form. 



2. Primitia, sp. Plate III, figs. 7 — 11. 



Description. — Valve elongate, ovate-oblong. Dorsal and ventral edges nearly 

 straight. Ends nearly evenly convex. Surface finely tuberculate, marked with a 

 slight central inequality in the dorsal region. 



Size. — Length 1 mm. 



Locality. — Two specimens from Pilton are in the Porter Collection ; two from 

 Saunton Hotel in Miss Partridge's Collection ; and several, which are very 

 doubtful, from Saunton Hotel in my Collection. 



Bemarlcs. — These fossils show very little character; there are indications of a 

 central vertical inequality in the valve, which is probably Primitian in character, 

 but has been more or less modified by pressure. The four first-mentioned specimens 

 appear to have been covered with a very fine granulation. In those from Saunton 

 the great squeezing of the beds has very much obscured the natural shape, as will 

 be seen from my two specimens figured from that locality. 



1 1893, Jones, ' Quart. Journ. Geol. Soc.,' vol. xlix, p. 291, pi. xii, figs. 4«, b. 



2 1891, Krause, ' Zeitsch. Deutsch. Geol. Gesell.,' vol. xliii, p. 498, pi. xxxi, fig. 2. 



3 1890, Ulrich, ' Journ. Cincin. Soc. N. H.,' vol. xiii, p. 131, pi. x, figs. 3, 4. 

 * 1891, Ulrich, ibid., vol. xiii, p. 203, pi. xii, figs. 11 «, b. 



