554 Mr. J. C. Melvill on the 
Delphinula diplacostira*, sp. n. 
(Ll. 1X. figs. 5, 5a, 56.) 
D. testa parva, profunde sed anguste umbilicata, albo-straminea, 
solidula, supra planata; anfractibus quatuor, quorum tres planat, 
depressi, simplices, ultimo rapide accrescente, effuso, apud peri- 
pheriam acute bicarinato, carinis arcte spinicostatis, superficie 
undique longitudinaliter tenuissime squamato-lamellosa ; apertura 
rotunda; peristomate extus breviter spinoso, paullum effuso, 
margine columellari crassiusculo, nitido, albo, ad basin producto, 
basi circa umbilicum indistincte concentrico-striata, interstitiis 
undoso-gemmatis. 
Alt. 3, diam. 6 mm. 
This little species, perhaps not quite fully grown, is distinct 
from all the others of the genus known to me, in its lamellate 
longitudinal striz, double peripherial carinations, the upper 
keel possessing twelve, the lower seventeen coronals of short 
spines. The umbilicus is very deep and narrow, the con- 
centric sulcation and waved gemme interposing at the base 
are characteristic, the columellar extension towards the base 
recalling other De/phinule. The colour is throughout pale 
stramineous. J). stellaris, Ad. & Reeve, is perhaps the 
nearest species in affinity. 
Donax (Serrula) epularis }, sp. n. 
(Pl. x tos. 'a.) 
D. testa subtrigonal, equivalvi, inequilaterali, alba; umbonibus 
parvis, seepe violaceis, incurvis, approximatis; margine dorsali 
antice obliquato, extenso, postice multum abbieviato, ventrali 
subrotundato, conspicue multidenticulato, superficie omni arcte et 
pulcherrime decussata, costis longitudinalibus latus versus posti- 
cum magis conspicuis, sed antice nequaquam evanidis, sulcis 
spiraliter distinctis praedita, postico latere pulchre sulcifero et 
costato, costis breviter spiniferis, ad marginem bino spinarum 
longiorum ordine decorato, intus pagina nitida violaceo-tincta, 
postice radio nigro-violaceo magis conspicuo, sinu palliali in- 
definito. 
Alt. 5:50, lat. 8°50, diam. 4 mm. (sp. maj.). 
An exceedingly highly decorated species, though it must 
be examined with a lens before its characters are very per- 
ceptible. All the specimens are small, and they have in all 
probability not yet attained their full growth ; but the sculp- 
ture is unmistakable and more elaborate than in the other 
species of this large genus that are comparable with it. 
* Oindag otetpa, with double keel. 
1 
} Lpularis, sumptuous. 
