MONOGRAPH OF THE GENUS 



TYPHIS, Montfort. 



Gen. Char. Testa spiralis, canalifera, muricifomiis ; anfractibus 

 trivaricosis, inter varices tubiferis, ultimo niagno ; tubis singulis 

 rotundis apertis, intiis penetrantibus, inter varices instructis j 

 apertura ovali, subcontract:!, subintcgra, canali clauso ; operculo 

 corneo, nonspirali, nucleo subterminali. 



Between eacb varix on the upper part of each whorl is a round 

 tube, the hollow of which penetrates into the interior of the shell. 

 In every other respect the shells of this genus have the usual 

 character of three-variced niurices. 



Species. 



1. Sowerbyi, Brocl., (f. 11, 12, 13). — Subturbinata, alba et 

 fusca, canali superne lato, termine angusto, retrorso, varicibus 

 laminatis, laqueatis, medio contractis, superne subexpansis, in- 

 curvis, acumiuatis, tubis plus niinusve elongatis. — Of a turbinate 

 form, with long tubes and fluted varices contracted in the middle. 

 T. fstulosus, Bronchi. The fossil type is a shell with rounder 

 whorls. 



2. quadeatus, Hinds, (f. 10). — Quam T. Sowerbyi magis 

 quadratus, canali latiori, tubis brevioribus, anfractibus spiraliter 

 strigatis, varicibus crassioribus, ad marginem fimbriatis. — Differing 

 from T. Sowerbyi in being more square, the canal being broader 

 above and the varices being thicker with a fringe on the margin. 



3. nitens, Hinds, (f. 1, 2). — Brevis, alba, varicibus simpli- 

 cibus laminatis, termine rectiusculis, tubis breviusculis, canali 

 brevi, truncato.- — Short, white, with simple laminated varices, 

 rather straight at the end ; canal short, truncated. 



4. Yatesei, Crosse, (f. 20, 21). — Subfusiformis, pallida, vari- 

 cibus laminatis, subduplicatis, termine superiori acutis, incurvis, 

 medio expansis, crenulatis, ad infra coarctatis, termine pinnatis; 



