218 A. E. Verrill on Shells from the Gulf of California. 
Len 3°15 inches. 2°55 2°35 44 
Height 2°65 & 2°2 2°05 116 
read 140 i 1:12 “90 52 
Apex to anterior end, 10 ee 1:86 1:60 1:00 
Plication to posterior end, 8 re 6 5 
Palial sinus from edge, 85 ees Nar 1:38 85 
Bread 0., 7 e 74 62 32 
Near az,—Capt. J. Pedersen. Six fresh specimens, the 
as figured by Reeve (Icon., vol. viii, Pl. v, 84), is similar in form 
] 
! own. 
| Goverty, 1832) was described from a single valve 
found at Tumbez, Peru. It is more orbicular and the lamelle 
are much closer. 
Semele formosa. 
mphidesma formosum Sowerby, Proc. of the Committee of Science and Corres- 
aeaye of the Zodl. Soc. of London, Part II, 1832, p. 199; Reeve, Icon., vil, PL 
iv, 
Semele formosa Adams, Genera, ii, p. 411. 
ng * 
therefore, even less prominent. The sides are covered with 
close, more or less irregular, often slightly oblique, concentric, 
nodulose on the umboes and anteriorly; beyond the stron 
posterior plication they are stouter, irregularly bent up a2 
Sronnsed, —— the apex rugose. Hinge less ary than - 
he preceding, the internal ligament more parallel and nearer 
the it nated. Palial sinus 
the margin, its plate not truncately terminated. 
