1865.] DR. P. P. CARPENTER ON NEW MOLLUSCA. 203 
natis, postice divergentibus, striis incrementi crebris acutis, 
aliter haud sculpta ; parte anticat. jun. aperta, adulte clausa ; 
clausis tenuissimis, secundum incrementa undulatis, super um- 
bones prolongatis, umbilicos postice formantibus ; epidermide 
Sugaci, tenui, pallide viridi. 
Hab. Monterey, Rich. ; Vancouver, Lord; 8. Diego, Cooper. 
= Pholas darwinii, Sby. 
= Jouanettia darwinii, Mus. Cuming. 
= Parapholas penita, Tryon, Mon. Phol. 
This remarkable shell differs from Jouanettia in having both 
valves equal; from Pholadidea proper in having no coriaceous 
cup, its place being supplied by a flattened prolongation from 
each valve, like a duck’s bill in miniature. In Mr. Lord’s specimen 
(preserved in the British Museum), though the valves are closed, the 
prolongations are widely divergent, as when the bird utters its cheer- 
ful “quack.” The loose, thin epidermis appears to have covered the 
bill as well as the valves. Mr. Tryon had probably not seen a speci- 
men, else he could hardly have affiliated so very different a shell to 
Pholadidea penita. The original specimen is said to have come from 
Chili. 
Darina DEC LIVvIs. 
D. t. tenuissima, planata, elliptica, Machereformi, utroque latere 
hiante ; cinerea, epidermide Sortiore induta ; marginibus regu- 
lariter excurvatis ; umbonibus haud conspicuis, ad duas inter 
quinque partes longitudinis postice sitis: intus cartilagine 
spathula elongata, dorsum versus utraque valva decliviter Sita, 
a ligamento lamina extante tenuissima separata; dente car- 
dinali laminato, extante, curtiore; lateralibus vir conspicuis ; 
sinu pallii ovali, fere ad medium porrecto. 
Long. 1-77, lat. ‘85, alt. -34 poll. 
Hab. Vancouver’s Island (Forbes). 
The only other species of Darina known is from the Straits of 
Maghellan. The northern shell may have been passed over as the 
young of Machera patula, to which it bears a strong external re- 
semblance. 
Sax1pDomus BREVISIPHONATUS. 
S. 4. subovali, tenuiore, subplanata, albida, epidermide pallide 
olivacea induta 3 tota superficie rugis concentricis, crebris, 
valde obtusis, et undis incrementi interdum majoribus, ornata ; 
marginibus subequaliter ewcurvatis, mazxime ventrali: intus 
cardine tenuiore, dente antico elongato ; sinu pallii parvo, ad 
trientem interstitii porrecto, latiore. 
Long. 2°65, lat. 2°05, alt. 1°15 poll. 
Hab. ?Vancouver, ’Japan (Mus. Cuming). 
A very distinct species, in shape and hinge not unlike Callista, but 
without lunule. It is more rounded and flatter than the three ty- 
pical Californian species, and known at once by the very small mantle- 
bend. From four to six blunt riblets are seen on each of the very 
