142 



Genus Siphoxalia. 



synopsis of species. 

 "Whorls augtilated, subiinbricating. 



Spire elevated ; crenate-dentate on the keel ; spirally 

 1 irate. 1. S. suhreflexa. 



Spire short ; nodulate on the keel ; transversely lamel- 

 late. 2. S. lamelUfera. 

 Whorls shouldered. 



Shell elongate-fusiform and costated. 



Lirae, 15 ; tubercles, 13. 3. S. BoUini 



Lirae, 11 ; tubercles, 11, and stouter. 



4. S. Jongirostris. 

 Shell pyriform, costated anteriorly. 5. S. spatiosa. 



1. Siphonalia subreflexa, G. B. Sowerhy. 



Fusus suhreflexus, Gr. B. Sowerby, in Darwin's G-eological 

 Observations, 1S44, 2nd ed., p. 616, t. 4, fig. 57. 



Shell fusiformly turreted; apex small mamillate of two 

 smoothwhorls ; the next four whorls convex, transversely 

 €Ostated, and spirally lirate ; the four anterior whorls angu- 

 lated and ventricose in front of the middle, the posterior slope 

 ■convex, tuberculated on the keel, spirally lirate with alter- 

 nately stout and slender threads, and cancellated by transverse 

 stride. The tubercles are compressed, prominent, and about 

 13 to a whorl. Aperture large, oval ; outer lip lirate within ; 

 canal long, curved to the left. 



Length, 85 ; breadth, 40 ; length of aperture, 32 ; width of 

 aperture, 19 ; length of canal (incomplete), 20. 



Locality. — Lower beds at Muddy Creek (J. Dennani /) 



This species is markedly distinct from the two next species 

 by its prominent submedial tuberculated keel, without any 

 trace of costation, except on the posterior whorls. It is with 

 some reluctance that I ascribe our fossil to Sowerby's F. suh- 

 o'pflexus, from the Chilian Tertiary, as it is possible that differ- 

 €rences of ornament or other minute characters may really 

 exist which are not pictorially or verbally indicated. 



2. Siphonalia lamellifera, spec. nov. Plate viii., fig. 5. 

 Shell ovately fusiform, stout, with a low conic spire of sub- 

 imbricating flat whorls ending in an obtuse apex. Whorls six, 

 a,ngulate over the suture ; last and penultimate whorls bluntly 

 nodulose on the keel (eight to a whorl). Last whorl bisected 

 by a blunt keel, the medial portion roundly truncated, orna- 

 mented with stout plications, which terminate at the keel in 

 stout, blunt nodulations ; anteriorly abruptly contracted into 

 the concave base, which is prolonged into a broad, curved, up- 

 turned, loDQ-ish canal. Surface ornamented with imbricatiusj 



