INSTITUTE OF SCIENCE, PHILADELPHIA. I77 



subsutural ridge, but on the body behind are four or five hrse ; outer lip 

 angulated and widest at the shoulder, simple, a row of small, short lirse within 

 it as in dwarf specimens of S. bitJibcradatus ; pillar with a thin callus, sharply 

 recurved in front with a distinct fasciole ; canal narrow, much recurved, 

 obliquely truncate ; genital sulcus distinct ; last whorl sometimes wavy on 

 the back as in 5'. integer. Max. Ion. of adult shell 70.0; max. lat. 45.0 mm. 

 This form recalls the smallest specimens of 5. bituberculatiis and is the 

 analogue of 5. coronatus Defiance, of the European Miocene, but is consider- 

 ably smaller. It is much less common than 5. Aldriclii, from which it may 

 readily be distinguished by its non-ascending posterior lip, its lirate body 

 and throat and the general form of the aperture. It transmits several of the 

 features of S. albirtipianiis, and we fancy that they seem to reappear in the 

 recent 5. bihiberczdatiis Lam. It may possibly be identical with Sowerby's 

 5. bifrons, but which is a much smaller shell, of which the aperture has not been 

 figured. The differences appear too great to unite them without more data. 



Strombus pugilis Linng. 

 Strombtts pugilis Linn^, Syst. Nat. xii. p. 1209 ; Gtnelin, S. N., p. 3512 ; Dillwyn, Cat. 



Rec. Sh. ii. p. 664, 1817. 

 Shonibus a/a/us Gmelin, op. cit. p. 3513. 

 Strombus Sloanii Leach, Zool. Miscel. i. pi. 22, 1814. 

 Strombus ambiguus Sowerby, Quart. Joiirn. Geol. Soc. vi. p. 49, 1S50. 

 Strombus proximus Sowerby, op. cit. p. 49, pi. 9, fig. 8, 1850. 

 Strombus pugitis Guppy, op. cit. xxii. p. 287. 

 Strombus fragitis Moore, op. cit. xix. p. 511. 



Strombus pugiloides Guppy, Geol. Mag., decade ii. vol. i, p. 442, 1874. 

 Strombus proximus Guppy, Quart. Journ. Geol. Soc. Nov., 1876, p. 521. 

 Strotnbus pugitis , var. alatus, Heilp., Trans. Wagner Inst. i. p. 86, 1887. 



Miocene of Haiti, Jamaica, Anguilla, and Costa Rica {yz.x. proximus [Sby.] 

 Guppy). Pliocene of Costa Rica and of South Florida at Myakka River, 

 Shell Creek, Alligator Creek, and on the Caloosahatchie River (typical form 

 and var. alatiis). Post- Pliocene of Red Bluff, North Creek and West Florida, 

 generally of South and North Carolina as far as Cape Hatteras. 



If we examine a full geographical series of this species, we shall notice at 

 once that the southern specimens are smaller, with sharper and more promi- 

 nent spines, and of a uniform rufous-pink color. The northern specimens are 

 much larger, variegated externally with rich dark brown, and with relatively 

 shorter spines. The presence or absence of spines is a feature probably related 

 directly to the environment as previously described in the case of Melongena 

 corona. The variety without them seems more common in Florida than in 

 the Antilles, and forms the variety alatits of Gmelin. But a spineless variety 

 is also found in the South. In the Pliocene of Florida the var. alatus is more 

 common by far than the spiny form, but both are found there. In the Antil- 

 lean Miocene the vAv'xety proximus Sby. preserves sometimes the dark zigzag 

 lines of color which at the present time are peculiar to northern specimens. 



