191 
attenuation which throws the umbones into an oblique direction and 
contracts the ligamentary area in the P. assimilis; there are more- 
over nine or ten well-developed ridges in the shell under considera- 
tion, whilst in that under comparison there are not more than five 
or six, and the internal marginal denticulations are consequently 
narrower and more numerous. Future discoveries can alone decide 
whether these are constant differences or casual modifications. 
Genus Carpita. 
Carpita RADULA. Card. testé subquadrato-oblongd, allidd, de- 
pressd, costis tribus et viginti, rubido-fuscis, imbricato-squamosis, 
squamis fornicatis, semi-erectis, subacutis ; costarum interstitiis 
crenulatis ; margine crenato. 
Conch. Icon., Cardita, pl. 1. f. 2. 
Hab. 2 
There are two or three more ribs in this shell than in the follow- 
ing; the dark spots are more numerous, of a reddish instead of a 
bluish brown, and not of that peculiar half-moon shape, and the 
scales are more vaulted and erect. 
Carpira pica. Card. testd elongato-ovatd, gibbd, alba, nigro aut 
fusco varie inquinatd ; costis septemdecim sedecimve, in medio 
angulatis, subtiliter squamosis ; intus alba, postice nigerrimo- 
Sused. 
Conch. Icon., Cardita, pl. 2. f. 8. 
Hab, Island of Guimaras, Philippines (found under stones at low 
water) ; Cuming. 
There is a peculiarity in the shape and blotching of this shell 
which entitles it to be distinguished as a new species. Several 
specimens were collected by Mr. Cuming at the above-mentioned 
island, singularly agreeing in respect to these characters. 
CarpiTa GuBERNACcULUM. Card. testa ovato-oblongd, depressd, 
anticé brevissimd, angustd, posticé latissimé rotundatd, subalatd ; 
brunned, luteo purpureogue umbones versus tinctd ; costis plus 
minusve squamosis, superioribus perpaucis, majoribus, inferiori- 
bus angustis numerosis ; intus brunned, anticé albicante. 
Var. B. Testa alba, fusco via tincta, 
Conch. Icon., Cardita, pl. 3. f. 9. 
Hab. Zanzibar. 
This is the nearest allied species to the C. semi-orbiculata; the 
dark variety might indeed be easily mistaken for it, were it not for 
the scales and peculiar elongation of the ventral portion of the shell. 
Carpita MARMOREA. Card. testd elliptico-ovatd, postice rotun- 
datd, anticé peculiariter brevi ; lacted, nigro wmbones versus ma- 
culatd ; costis quindecim sedecimve, recto-elongatiusculé radian- 
tibus, latescentibus ; anticis crenatis, intus eburned. 
Conch. Icon., Cardita, pl. 5. f. 12. 
Hab. New Holland. 
