^^° ZOOLOGY. 



to the Zoological Garden of Rotterdam. It is uoteworthytUat these 



.leloupe (P. (fmyana) a„d one of tbe eastern (P. Be«ricmt''LTL 

 ..mbmcns. while the other two, Pleura,., Jia AiLZl^^Z! P 

 B»,m are deeply nmWlieated. The soft parts of Ple,.roZX J^e 

 t,ll nnkuown, although we may hope that oar aequaintance w hTform 

 so interesting may not be much longer deferred in«^,„„„i,t 

 specimen of P. Quo,ja,u,. was obtained1,y liofeio A^^ott tVe h""! 

 ot- Barbados (at a depth of 120 fatho4),aiK,t ntw i ^ti: M^"' 

 Comparative Anatomy at Cambridge. (See Hilgenbopp i. «T 

 berichte der Gesellschaft Naturf fJcuik e Z BeZ™ "rp" > tZ' 

 MAN ,n Tijdschrift Nederl. Dierkund. Vereen.? vol i ' 18 9 ' iT' 

 2^Z^ F:sh.k in Journal Conchyliologie; (3,)' vo'l. '.^'pl^ t^^ 



DENTITION OF MAUGINELLOID MOLLUSKS. 



The contour and development of the shell of Marainella i. nn,>P ohn 

 acte.stic, bnt nevertheless there are now In^ow^ ^t^t^^^e't 'l ";" 

 dentition represented by forms possessing- decidediv simdar . . fi i 



If the Eratoina^ are considered, we have a fifth ' '"^ 



ww'^'f generally known, most of the species have a single central 



th„seoftheMnricin.,h:ingthicU,r„'nr::d»L7^tl';:;"(^^ 



(3.) Towards the end of the year 1880 a third type was found to be 



epresented by what ha. been called P.«^„„a„,,-JL /J2«r"lwb J 



has been also by .some (but erroneously) identii'ed with thf ' if ,f 



«.,» Of Eastern Africa. Shells Ji iT:^^ wL s SL^ 



Senegambia, and the species was ascertained to have the teeft arrayed 



o hr„;tf «'"""7' ™"^' d-l-'). »'t their form very "riar 



thrle cufps ''™""'"^^' '""^ '^'^■■^' '-^^ •'«"»- "-^^ -'1 arn.ed With 



(4 ) A iburth marginelliform type has also teeth in three series 



«at\rnrroTtt:Th::':;i:-^^^^^^^^ 



— ly regarded as a true m'ember^ oHlXXIr^^.rit V'Z 



