154 
November 22; 1842. 
William Yarrell, Esq., Vice-President, in the Chair. 
The following paper, by M. C. A. Récluz, entitled ‘“‘ Descriptions 
of various species of Navicella, collected by Mr. Cuming in the Phi- 
lippine Islands,” was communicated by H. Cuming, Esq., Correspond- 
ing Member, who exhibited specimens to the Meeting in illustration 
of the descriptions. 
The longitudinal diameter of the Navicelle described in this cata- 
logue has been taken from the anterior to the posterior side, and the’ 
transverse diameter from the summit to the base of the external 
opening, in its broadest part. 
1. NavicELua JANELLI, Récluz, Revue Cuviérienne, 1841. p. 376. 
No. 9. 
Var. a. Testd ellipticd, convexd, crassiusculd, vix cancellatd, lineis 
nigris reticulatd, interstitiis lutescentibus. 
Var. (3. T. lineis nigris supern? reticulatis, antic? remotiusculis, sub- 
@quidistantibus ; aperturd margine cinereo-nigrescente, in fundo 
aurantid, interdum nigro-maculatd. 
\ Var. y. T. dorso nigro late pictd et maculis concoloribus variegatd, 
antic? lineis nigris radiatd, postice dense lineolatd ; labio lateraliter 
emarginato, medio subproducto ac rectiusculo. 
Var. 6. T. lutescente, dorso transversim late et remot? nigro undatd ; 
zonis interdum antice conico-angulatis. 
Var. e. T. orbiculari, dorso nigerrimd, maculis lutescentibus sparsis 
notatd, margine breve lineatd, postic? lateraliter, interdum luteo- 
viridescente ; aperturd margine cinereo-nigrescente. 
Dimensions.—Var. a, 1°80 poll. longa; 1°28 ad 1°40 lata; 0°76 
ad 0°80 convexa. Var. e, long. 1°20 ad 1:40; lat. 0:96 ad 1:08; 
conv. 0°48 ad 0°52 poll. 
Hab. ad Insulas Philippinas. Var. a and y from Agoo, province of 
Pangasinan, island of Lucon: on stones in a rapid river. The var. 
3, 6, and e, from Iba, province of Sambales, island of Lucon; on 
stones in a deep river. 
The only difference I find between the varieties brought from the 
Philippine Islands and those from Guam (of which I have only been 
able to examine a single specimen) is, that the former are rather more 
solid and more convex. As to form and colour, they are too variable 
to dwell upon. ; 
The operculum of this Navicella has particular characters, which 
it is important should be known, as confirming the specific value of 
this shell. ‘ 
Operculum almost square, rather longer than broad, subconvex 
