1865.] OF MOLLUSKS FROM WESTERN NORTH AMERICA, 279 
nymphalis, but differs in the internal scars.. Externally it resem- 
TL. dombeyi, Lam. (= Scerobicularia producta, Cpr. P. Z. 8. 1855, 
p- 230), but is easily recognized by the strictly Tellinoid ligament 
and anterior lateral tooth, by the posterior portion being pinched 
instead of waved, and by the junction of the pallial sinus with the 
opposite scar. By the same characters it is distinguished from 7. 
tersa, Gld., which closely resembles S, dombey?, var., in Mus. Cum. 
Like many other Tellens, it has a white and a pink variety. The 
uame was printed by an oversight in Brit. Assoc. Rep. 1863, p. 669, 
as A. amplectans ; but as it was unaccompanied by a diagnosis, and 
does not describe the shell, no confusion will arise from reverting 
to the name first given. 
LuciInA UNDATA. 
L. ¢. convexa, tenuiore, albida; tota superficie lirulis concentricis 
ereberrimis, compressis, haud acutis ornata, interstitiis mini- 
mis ; parte ventrali costis radiantibus iti., obtusis, latis, vali- 
dissimis, interstitiis parvis ; lunula maxima, a sulco bene defi- 
nita, sub umbonibus incurvatis fossa alta minuta indentata 3 
parte postica alata; margine a costis valde undato, minute 
crenulato ; ligamento quasi interno : intus dent. card. parvis, 
a fossa lunulari intortis ; lat. curtis, obtusis ; cicatr. adduct. 
antica irregulari, postica subovali ; linea palliart prope mar- 
ginem sita, undata. 
Long. °45, lat. °44, alt. °3. 
Hab. Gulf of California (teste Rowell). 
The outline somewhat resembles Cryptodon; but the aspect 
is more that of Verticordia, while the minute subumbonal pit 
is suggestive of Opis. The shell is sexpartite ; the portion between 
the anterior rib and the lunule resembles a fourth rib, while the 
projecting lunule and the posterior wing are quite distinct from the 
body of the shell. The specimen sent by Mr. Rowell to the Smith- 
sonian Institution was completely smashed. The diagnosis is written 
from a perfect shell sent by Dr. Newcomb to Mr. Cuming. 
CauLiostoma (? LIMA, var.) HQUISCULPTA. 
C. ¢t. “C. lime” simili; sed anfr. planatis, suturis haud dis- 
tinctis ; sculptura regulari ; jun. monilibus spiralibus inter se 
equalibus ; t. adulta majore et minore alternantibus ; colore 
rufescente, granulis interdum rufo-fusco maculatis. 
Hab. Acapulco (Newberry). 
Dr. Newberry’s specimens agree in most essential respects with 
* Trochus lima, Phil.,” in C. B. Ad. Pan. Shells, no. 276, which 
appears identical with the shells marked “ Ziziphinus antonii, Koch, 
N. Zealand,” in Mus. Cuming. The Acapulean shells are quite 
flat, while those from Panama are for the most part shouldered as 
in C. eximium, Rve. (= C. versicolor, Mke. Maz. Cat. no. 289). 
However, there is no little variation among the Professor’s speci- 
mens of C. dima, and some are so slightly shouldered that the Aca- 
pulcan form may be a local variety. 
