OF CONCHDLOGY. 



151 



Dimensions. — Length of specimen 137 mill.; of spire 31 mill.; 

 greatest width 66 mill.; width of aperture 33 mill.; angle of di- 

 vergence 80°. 



Observations. — This species is represented by a single speci- 

 men in the collection of the Smithsonian Institution, and Avas 

 presented by Prof. S. S. Haldeman, who obtained it from a Mr. 

 Hodge, of North Carolina. It is most closely related to the S. 

 excavatus (Conrad) but is at once distinguishable by its more 

 evolved spire, the flatness and striation of the whorls above the 

 angle, and the comparatively shallow sutural channel ; the raised 

 revolving lines are also broader and more approximated. 



It is possible that this species may have been confounded with 

 the '-'- Cassidulus carolinensis " of Tuomey and Holmes,* but the 

 figure published by those authors happily permits the identifi- 

 cation of the individual illustrated with the S. excavatus. It is 

 unnecessary to compare the present with any other species (if 

 the descriptions or comparisons are correct), as it belongs to a 

 group of which the one described and S. excavatus are the only 

 known American species. Its slender form and elevated spire 

 recall to mind the Fasciolaria tiilipa. 



TuDiCLA Link ex Bolten. 



< Tudicia, Bolt., Mus. Bolt. 1798 (spirilla). 



= Tudicia, Link, Besch. Nat. Samml. Rostock, iii. 1807 p. 120 

 {spirilla). 



< Tudicia, Ad. f., Gen. Moll. i. 1853, p. 151. 



= Busycum {Tudicia) Morch, Cat. Yoldi i. 1852, p. 104. 



z= Haustellum, a, Schum, Ess., 1817, p. 213. 



= Pyrella, Swaii.s., Mahic, 1840, p. 213. 



= Spirilla, Sowb., Jr., Conch. Man., 1842, p. 243. 



= Spirillus, Sowb., Jr., op. cit., p. 306. 



== 3Iurex {PyrenclUi), Gray, Guide Moll. B. M. i., 1857, p. 11. 



Shellvf'xth. a thin simple periostraca, tenui-pjn-iform, the whorls 

 wound tightly round the axis, leaving no umbilicus ; with the 

 whorls convex above the posterior angle ; below the angle some- 

 what ventricose, abruptly contracted and attenuated into a 

 narrow canal, which is much longer than the aperture ; siphonal 

 fasciole developed at the terminal half of the siphonal canal, 

 which is consequently tortuous ; spire depressed, with a papillary 



* These authors, for some inscrutable reason, have referred to Cassi- 

 dulus the species above alluded to and the Si/coft/pus jiyrum, while in 

 " Busyco7i" they retain the species of Falgw and two species of Syco- 

 tij'pus of the type of jb'. canal iculcUus. 



