ANODON.—P Late XXVII. 
deanus and others of the group, being widely open at 
each end; but it is more elongated, acuminated, and of 
thinner substance than the others. 

Species 106. (Mus. Walpole.) 
Anonon Puoaprrormis. An. testd elongata subcylin- 
dricd, obscuré olivaced, tenwi, inflata ; 
antico brevissimo, semi-rotundo ; latere 
latere 
postico 
elongatissimo, margine dorsali brevitisculo, laterali 
oblique convexo, terminali truncato. 
THE pyoLapirorm Anopon. Shell elongated, sub- 
cylindrical, dull olive, thin, inflated; anterior side 
very short, half round, posterior side very long, 
dorsal margin rather short, lateral obliquely 
convex, terminal truncated. 
SoweErsy. ; 
FTab. Montreal. 
This very cylindrical shell ismuch more straight and 
broad than Anodon ewilis, which it resembles in some 
respects. 

Species 107. (Mus. Walpole.) 
Axopon suncipposus. An. testd subrhomboided, tumidd, 
tenui, obscuré olivaced, subrugatd; intus albo- 
cerulescenti ; latere antico brevitisculo, margine 
dorsali brevi, recto, termino obtuse subquadrato,; medio 
subdepresso, umbonibus undato-tuberculatis ; latere 
postico angulato, oblique quedrato, ad terminum 
acuminato ; margine ventrali rectitsculo. 

Tue suscippous ANopon. Shell subrhomboidal, tumid, 
thin, dull olive, somewhat wrinkled, bluish- 
white within; anterior side rather short, dorsal 
margin short, straight, obtusely subquadrate at 
the end; posterior side angular, obliquely quad- 
rate, acuminated at the end; ventral margin 
rather straight. 
Antuony. MS. 
Hab. Michigan. 
The form of this species is rhomboidal, with a 
strong posterior angle. 

Species 108. (Mus. Walpole.) 
Awnopon SwINnHoE An. testd ovata, 
inflata, fusco-nigricati, ad medium politd, intis 
iridescenti prope 
salmoned; latere antico brevitsculo, semicirculari ; 
latere postico producto, lato, obtuso. 
Swinnoe’s Anopon. Shell ovate, nearly equally inflated, 
blackish brown, polished in the middle, brightly 
blue the 
umboes; anterior side rather short, semicircular, 
posterior side produced, wide, obtuse. 
Henry Apams. Pro. Zool. Soc., 1868. 
Hab. Island of Formosa. 
subequaliter 
vivide coerulea, umbones 
iridescent, within; salmon near 

