MUSEUM OF COMPARATIVE ZOOLOGY. 71 



sent as T. morchii from Norway to me by Prof. Sars and Dr. Jeffreys agree 

 better with Verrill's description of his Taranis bella than they do with the 

 figure above cited. It is not improbable that the species is pretty variable, and 

 that trifling variations in sculpture may not indicate specific differences. 



Trichotropis migrans n. s. 



Shell white, solid, rough, with six rapidly enlarging whorls ; upper whorls 

 rounded, last whorl with a tendency to applanation on the basal side ; epider- 

 mis lost ; spiral sculpture of (on the fourth whorl) five to (on the last whorl) 

 twenty revolving ridges, which cross (on the fourth whorl) twelve to Ton the 

 last) ten varix-like ribs or costaj, extending completely around the whorl; these 

 increase by dichotomy and between the costae are ([uite uniform, widening as 

 they reach the crest of a varix and then suddenly diminishing in breadth to re- 

 peat the process at the next one ; between the spiral ridges the interspaces are 

 channelled, and rarely contain a single a fine thread ; beside the costse the 

 whorls are crossed by beautifully fine and even raised lirse, corresponding in 

 direction to the lines of growth, and only visible under a magnifier ; aperture 

 rounded, produced into the narrow canal in front ; pillar with a thin lamel- 

 lar callus (behind which is a narrow umbilical chink) and a slight toothlike 

 projection on the inner side ; interior of aperture shining, smooth. Lon. of 

 shell, 9.25 ; of last whorl, 6.0 ; of aperture, 4.0. Lat. of shell, 6.0 ; of aper- 

 ture, 3.5 mm. Defl. 54°. 



Sigsbee, near Havana, 80 fms. 



The first of the genus from tropical waters. 



MaTginella "Watsoni n. s. 



Shell short, stout, white or yellowish white, polished, five-whorled ; suture 

 marked under the glaze with a darker translucent line ; apex obtuse ; in adults 

 the nucleus is obscured by the glaze, in young specimens it presents no diff'er- 

 ences from the rest of the shell ; last whorl shouldered roundly, forming a 

 rounded angle at the posterior part of the outer lip ; aperture narrow, labrum 

 and labium nearly parallel ; pillar with four clearly cut folds, the anterior con- 

 tinued around the margin of the canal, slightly flaring, to join the outer lip ; 

 the latter slightly thickened inside, with about a dozen rounded denticulations, 

 outwardly little or not at all reflected, joining the body behind at an acute 

 angle. Lon. of shell, 9.5 ; of last whorl, 8.0 ; of aperture, 7.50. Lat. of shell, 

 6.0 ; of aperture, L5 mm. 



Sigsbee, off" Havana, 480 fms. ; Station 2, 805 fms. Bed of the Gulf Stream, 

 Pourtales, 447 fms. ; Yucatan Strait, 640 fms. 



This species resembles M. vitrea Hinds, from West Africa, in general shape, 

 but that species is smaller and has the outer lip not denticulated. M. IVatsoni 

 has the facies of a deep water shell, and does not appear to agree exactly with 

 any I find figured. 



