FAUNA OF ORTHAULAX PUGNAX ZONE. 59 



LYRIA MUSICINA Heilprin. 



Plate 9, figs. 1, 4. 



Yoluta musicina Heilprin, Trans. Wagner Inst., vol. 1. p. 109, pi. 15, fig. 45, 



1887. 

 Lyria musicina Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 85, 1890. 



Oligocene of Richard's quarry, Ocala, Florida, in the so-called 

 Nummulitic bed; of the Chipola River marl, near Bailey's Ferry 

 (now the County bridge) ; of the lower bed at Alum Bluff, Chatta- 

 hoochee River ; and of the Tampa silex beds at Ballast Point, Tampa 

 Bay, Florida; Shepard, Willcox, Burns, and others. U. S. Nat. 

 Mus. No. 111842. 



LYRIA SILICATA, new species. 

 Plate 10, fig. 3. 



Shell small, light, slender, with 5 or more gently conA'ex whorls, 

 the apex decollate in the type-specimen; suture distinct, not chan- 

 neled; third whorl (counting backward from the aperture) with 

 about 16 narrow, rather sharp, riblets, with much wider interspaces 

 extending from suture to suture; these riblets on the later whorls 

 become less regularly spaced and obsolete, on the last whorl absent; 

 except for these riblets the surface appears to be smooth ; last whorl 

 much the largest, terminating at the outer lip in a thickened, 

 rounded, and expanded varix; aperture narrowly hmate with no 

 sinus or channel at the posterior commissure ; inside of the outer lip 

 smooth, without lirae ; body with a thin layer of callus ; pillar short, 

 thick, with two strong anterior plaits behind which are indications 

 of six or more minor unequal lirae ; canal short, wide, deep, the pillar 

 extending a little in advance of the outer lip, twisted, and with a 

 faint siphonal fasciole. Length of (decollate) shell 27.2, of last 

 whorl 22.5, of aperture 16, maximum diameter 14 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. One 

 specimen from the Post collection, U. S. Nat. Mus. No. 165065. 



Family MITRIDAE. 



Genus MITRA Martyn. 



Mitra Maetyn, Univ. Conch., vol. 1, 1784, table 1, fig. 19. (First species, 

 M. tessellata Martyn). — Bolten, Mus. Bolteuianiun. 1798, p. 135. — 

 Lamarck. Prodrome, 1799, p. 70; monotype, M. episcopalis Linnaeus. 



The first appearance of the genus Mitra in binomial nomenclature 

 was in Martyn's Universal Conchologist, in the explanatory table 

 of plates 19 to 23, inclusive. The name derives from Rumphius, 

 who used it for shells of the same group in 1705, in the Amboinische 

 Rariteitkammer. Five species were included, all belonging to the 



