224 TURRITELLID^. 



QYEOTROPis, Gabb. Cretaceous ; North Carolina. Shell thin, 

 resembling Trichotropis in form ; spire elevated ; umbilicus 

 widely open, funnel-shaped ; last whorl angulated above and 

 below the periphery ; covered with very thin foliated longi- 

 tudinal varices. G. squamosus, Gabb. 



Family TURRITELLID JG. 



Rostrum short, broad ; tentacles long and subulate, the eyes 

 slightly prominent on their external bases. Mantle with a fringed 

 margin, obscurely siphonated at the right side ; branchial plume 

 single, very long. Foot very short, truncate in front, rounded 

 behind, grooved beneath ; operculigerous lobe simple. 



Shell spiral, not umbilicated, spire very long, of numerous 

 whorls, with revolving striae or carinations. Operculum corneous, 

 multispiral. 



TURRITELLA, Lam. 



Screw-shfell. Etyvi. — Diminutive of hirris, a tower. 



Syn. — Turris, Humphrey. Xylohelix, Chemn. 



Distr. — 13 sp. World-wide. Ranging from the Laminarian 

 Zone to 100 fathoms. West Indies, United States, Britain 

 (1 sp.}, Iceland, Mediterranean, West Africa, China, Australia. 

 West America. Fossil, 172 sp. Triassic — ; Britain, etc.,]Sr. and 

 S. America, Australia, Java. T. terebra, Linn. (Ixvii, 55 ). 



Shell elongated, many-whorled, whorls rounded with revohdng 

 strise ; aperture rounded. Operculum many-whorled, with a fim- 

 briated margin. The shells are usually brown, with red-brown 

 spots or flames. 



TURRiTELLOPSis, Sars. Shell like Turritella, but tlie lingual 

 dentition differs. A boreal group, doubtfully distinct. T. acicula, 

 Stimpson (Ixvii, 56). 



HAUSTATOR, Moutfort. Whorls flattened, mouth subquadran- 

 gular, outer lip sinuoiTS. T. goniostoma, Yal. (Ixvii, 57 ). 



TORCULA, Gray. Shell turriculated, usually white or horn- 

 color, withovit markings ; whorls subangular, with a median 

 excavation ; aperture subquadrangular, the outer lip with a 

 slight median sinus. T. cochlea, Reeve (Ixvii, 58). 



ZARiA, Gray. Shell txirriculated, without color-markings, 

 whorls carinated ; aperture subquadrangular, outer lip simple. 

 T. cluplicata, Linn. (Ixvii, 59). 



MESALiA, Gray. Shell turriculated, of numerous whorls ; aper- 

 ture oval, subcircular, slightly produced, with sinuous and 

 reflected anterior margin ; inner lip a little twisted and flattened, 

 outer lip thin, sinuous posteriorly. T. 7nelanoides, Reeve 

 (Ixvii, 60 . 



EGLISFA, Gray.- Whorls rounded, with profound sutures; aper- 

 ture rounded, rather small, inner lip flattened, callous, angular. 



