MOLLUSCA — CTENOBRANCHIA. 
139 
of this genus in the Rev. Zool. p. 102. R. rufostoma ; globular ; knotty ; 
mouth violet internally ; at circumference white, with yellow stripes ; 
labrum internally with six teeth ; columella four wrinkles ; three cent. : 
Gambler Islands. R. monstruosa ; grey, wrinkled ; margin of lip with 
six unequal digitations ; mouth orange ; five warts on labrum ; three 
folds on the columella ; twenty-four mill, : same habitat. 
Some new species of the same author are added, ib. p. 186. Purpura 
violacea ; testa parva longitudinaliter et transversim costata, cancellata, 
grisea ; apertura violacea, obliqua, intus dentata ; canali distincta, colu- 
mella laevi ; Gambler and Marquesas Islands. P. aterrima ; t. ovata, 
nigra, spira brevi acuta, tuberculata, transversaliter funiculata ; apertura 
ampla, nigra, labro tenui : Gambler Islands. P. avenacea ; t. ovato- 
oblonga, fusiform!, atra, transversim striata ; striis perlatis, apertura 
longitudinal!, labro dextro lasvi, columella rufo-castanea : same habitat. 
P. hicolor ; t. ovata transversim tenuiter striata, grisea, striis nigris, 
anfractibus convexis, spira brevi, ultimo anfractu dilatato, apertura lon- 
gitudinali purpureo - atra ; labro dextro las vi, denticulis intus albis 
notato : South Sea Islands. 
Oniscia Dennisoni and strouibiformis, Reeve, Proc. 91 : habitat un- 
known. 
Sowerby’s monograph of the genus Aporrhais contains three species : 
— A. pespelecani ; A. pescarhonis, magis tenui quam A. pespelecani, 
canalibus elongatis, labio externo trilobate : Mare Medit. : and A. oc- 
cidentalis ; testa turrita concentrice plicata, spiraliter striata, canalibus 
brevibus, labio externo unilobato. Gray’s A. senegalensis is omitted. 
The monograph of the genus Rostellaria, by the same author, contains 
four species : — R. cmrvirostrum, Encycl. ; curia, Sow. (Zool. Proc. 1842, 
p. 165) ; rectirostrum, Lam. ; and Povesii, Petit MS. (?) The latter 
species has been described in the Rev. Zool. 1840, p. 326; and has 
appeared with a plate in the Magas, de Zool. 1843, pi. 53. 
The monograph of the genus Struthiolaria, by Sowerby, contains also 
five species (ib.) : — S. straminea (Murex stramineus, Gmel.) ; S. no- 
dulosa, Lam. ; S. inermis, Sow., Zool. Journ. ; 8. gigas, new species ; 
stramineae simillima, sed majore ; angulo anfractuum rotundata, nodulis 
minoribus ornato ; and 8, oblita, Sow. Tankerville Catal. App. p. 18. 
Sowerby enumerates fifty-eight species of the genus 8 trombus, ib., of 
which the following are new : — 8. crispatus (Proc. p. 143) ; 8. 8ibbaldii ; 
t. subclavata, laevi ; spira parva, anfractibus angulatis, plicatis ; ultimo 
magno, ventricoso, labio interno nigro-lineato ; labio externo interne 
striato, medio sub-incurvo ; sinu parvo ; Ceylon. 8. coniformis ; t. conica, 
laevi, pallide fulva, fasciis brunneis interruptis cincta, valide angulata, 
spira brevissima, anfractibus ad angulum plicatis, apertura angustata, 
labio externo vix expanso ; sinu parvo. 8. dubius ; form of a cone ; 
labrum slightly drawn forward, and mtemally crenated. 8. elegans ; 
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