T E I N S T iM A. 



Genus TEINOSTOMA, A. ^rf«m,«. 



Testa depressa, alba, poliia, solida, raro spinditer 



striata, regione umbilicali callo obtecto : apertiird 



lateraliter producta, ab axe remota. 

 Shell depressed, white, polished, solid, rarely spirally 



striated ; umbilical region covered by a callus ; 



aperture laterally produced, distant from the axis. 



Tiie difference between this genus and Adeorbis is 

 that while shells of the former are widely unibilicated, 

 those of the latter have the imibilicus filled up by a callus. 

 The mouth also is laterally produced and out of axis. 

 The localities of the few species known are as remote as 

 Mazatlan, Japan, and the Philippines. 



>pec 



(Fig. a, b, c, Mus. Brit.) 



TEixosroM.\ AMPLECT.AXS. Tii. testa valde dipnssa, 



spird plaimlatd ; aperturd producta, labia extcriio 



subrostralo ; callo crassn, rotnndato. 

 The folding Teinostoma. Shell much depressed, spire 



flattened ; aperture produced, outer lip rather 



beaked ; callus thick, rounded. 

 Carpenter. Cat. Mazatlan Moll., p. 253. 

 Uab. Mazatlan. 



Next to Teinostoma politum, this is the most pointed at 

 the outer lip and has the largest callus of any of the 

 species. 



Species '1. (Fig. ((, b, Mus. Brit.) 



TE1N0STO.MA CONCEXTRICUM. Tci. tfstd dcpressd, spiialitcv 

 teiiuiter liratd, svperni' convexd ; umbilico cidlo 

 oinidiiO obtecto ; aperturd atttice productd, siib- 

 (laiminatd. 



The Concentric Teinostom.a. Shell dejn-essed, spirally 

 finely ridged, convex above; umbilicus entirely 



April 



hidden by a callus; aperture anteriorly produced, 



slightly acuminated. 

 A. Adams. Ann. and Mag. Nat. Hist., IHCjo. 

 Uab. Takano-Sima, Japan. 



The only species covered with spiral stria'. 



Species ;i. (Fig. a, b, Mus. Brit.) 



TEIN0.S1-0MA ROLITL'M. Tei. testd valde dcpressd, politd, 

 superm plamdatd ; ultimo anfractu gibboso, 

 lateraliter producta ; aperturd productd, ovatd, ad 

 suturam columellarnqve ina'assatd ; labia externa 

 infra medium acute roatrato. 



The polished Teinosto.ma. Shell much depressed, 

 polished, flattened above ; last whorl gibbous, 

 laterally produced ; aperture produced, ovate, 

 thickened at the suture and columella ; outer lip 

 sharply beaked below the middle. 



A. Adams. Proc. Zoul. Soc, 1854. 



Ilab. Philippine Islands. 



Species 4. (Fig. a, b, Mus. Brit.) 



Tlinostoma substriatum. 7'ei. testd minima, nilenti, 

 prope suturam minutissitne striatd ; callo angusio, 

 circa rimam umbilicalem gyranti : aperturd sub- 

 rotundd ; labia interno crasso, fere anfractvvi 

 penultimum amplectanti. 



The substriated Teinostoma. Shell very small, shining, 

 very minutely striated near the suture ; callus 

 narrow, coiling round the umbilical rim ; aperture 

 nearly round ; inner lip thick, nearly enveloping 

 the last whorl. 



Cap.penter. Cat. Mazatlan Mull., p 254. 



Ilab. Mazatlan. 



1874. 



