298 



MARGARITA. 



M. MINUTULA Jeffreys. PI. 47, figs. 4, 5. 



Shell pyramidal, rather solid for its minute size, opaque and 

 polished ; sculpture none ; color white with a yellowish tinge ; spire 

 raised ; whorls 6, moderately convex but compressed, regularly en- 

 larging ; the last is slightly keeled on the periphery and occupies 

 about two-fifths of the shell ; apex blunt ; suture distinct and rather 

 deep ; mouth representing an arc of two-thirds of a circle, incurved 

 just below the periphery, and somewhat expanded below ; umbilicus 

 sunken, with a small and deep perforation in the middle. 



Alt. .0625, diam. .05 in. (Jeffreys.') 



N. Atlantic. 



T. minutulus JEFFR. P. Z. S. 1883, p. 95, t. 20, f. 2. M. minima 

 Seguenza (MS.) teste JEFFR. 1. c. 



Has been found fossel in the pliocene at Messina. 



M. LAMINARUM Jeffreys. PI. 47, figs. 6, 7. 



Shell conical, rather thin, semitransparent and lusterless ; sculpt- 

 ure, numerous thin and delicate but jagged and irregular curved 

 laminae in the line of growth, which do not extend to the umbilicus ; 

 there are about 40 on the last whorl, some of them double ; the inter- 

 stices are quite smooth ; color li^ht yellowish-brown ; spire raised ; 

 whorls 6, convex and rounded ; the last is equal to about two-fifths 

 of the spire ; apex twisted ; suture distinct ; mouth nearly circular ; 

 outer lip thin, but thicker and expanding at the base and partly 

 folded over the umbilical perforation ; umbilicus somewhat concave, 

 with a small perforation. Alt. '15, diam. *1 in. (Jeffrey*.} 



Off Cape Mondego, 795-994 fins. 

 T. laminarum JEFF., P. Z. S. 1883, p. 95, t. 20, f. 3. 



M. CANCELLATA Jeffreys. PI. 47, fig. 8. 



Shell forming a depressed cone, rather thin, opaque and lusterless ; 

 sculpture, oblique laminar ribs in the line of growth which are 

 crossed by as many but slighter spiral striae ; there are about 20 ribs 

 and striae on the last whorl ; this sculpture covers the base, but the 

 striie are wanting on the apex ; color pale yellowish-brown ; spire 

 rather depressed ; whorls 5-6, convex ; the last occupies three-fifths 

 of the shell; apex regular and compressed ; mouth more round than 

 oval, angulated above and below on the inner side ; outer lip some- 

 what expanded and thickened ; inner lip nearly straight, attached to 



