109 



The genus Tliala was erected by Messrs. H. and A. Adams 

 in 1853, for shells which combine the characters of Mitra, 

 Pleurotonia, and Fasciolaria. The type specimen. T. nxmfera 

 was found in the Philippines, and perhaps this makes only 

 the second or third specimen of a very rare genus. 



Makginella octoplicata. n.s. Shell solid, smooth, 

 shining, pyriform, spire scarcely visible, of three very small 

 depressed whorls, body whorl distinctly striate with lines of 

 growth, mouth narrow, sub-sigraoid, columella with eicjlit 

 plaits, the anterior valid, scarcely oblique, the posterior four 

 faintly traceable, outer lip much thickened, and very regularly 

 dentate with 12 raised linear teeth, at the base of the colu- 

 mella there is a distinct varix, which proceeding round the 

 posterior end of the shell unites with reflected lip making that 

 broadly marginal. 



This shell has considerable resemblances to certain forms 

 from the Indian Archipelago, but is unique in its multiplicate 

 columella, and peculiarly dentate outer lip. In this respect it 

 bridges over the gap between Marginella, and Erato, and 

 Cyprea. JZ. h-plicata, Lam., M. elecjans, Gmel., and M. turhinata, 

 Sew., show an approach to this form, but they are larger 

 shells. If the lower part of the columella were not so dis- 

 tinctly plicate, and the tipper teeth so rudimentary I should 

 have no hesitation in placing this as a species of Erato. 



Marginella stkombipormis, n.s. Shell small, solid smooth 

 shining, ovate, narrowed anteriorly, spire short obtuse, whorls 

 four, rounded, body whorl obscurely longitudinally plicate be- 

 low the suture, columella anteriorly obliquely somewhat 

 coarsely quadri-plicate, aperture narrow, curved posteriorly 

 emarginate, outer lip conspicuously thickened and produced 

 posteriorly, finely, tuberculately dentate within. Long. 3, lat. 7. 



Very different from Australian forms, all of which, as far 

 as I know, have the lip smooth. It is nearest in form to the 

 Indian M. Marr/uerita, Kiener, but that is a somewhat larger 

 and more angular shell. Not unlike a minute strombus viewed 

 from above owing to the pi-oduced lip. The genus is very 

 poorly represented in European tertiaries, few being known 

 and none living in the northern seas. 



Marginella wentworthii. n.s. Shell small, ovately 

 oblong, tumid, smooth, shining ; spire exsert, obtuse, whorls 

 five, roundly angulate, aperture narrow,oblong, outer lip much 

 thickened, deeply channelled above, enamelled on the edge, 

 with numerous small tubercular teeth within the margin ; 

 columella with four ptlaits ; the three anterior oblique, fourth 

 at right angles to the axis, anterior aperture widely chan- 

 nelled. Long. G, lat. 3;"; mil. 



Trivia euroi'EA. Montf. Testae. Brit, (as Cijin'ca) C. 



