MAZATLAN UNIVALVES 349 
Hab.—“Sitcha, Mexico and San Salvador,” Philippi.—Sitcha 
and New Albion, Barclay, (teste Midd. sed v. supra.)— 
Panama & Taboga; extremely common on ledges and large 
fragments of rocks at or above high water mark; C. B. Ad- 
ams.—Mazatlan; common; Melchers.—Do. not uncommon ; 
LD'pool & Havre Coll. 
Tablet 1657 contains 6 sp. compact form.—1658, 6 do. nor- 
mal shape.—1659, 6 do. more elevated.—16€60, 6 do. elongated.— 
1661, 5 do. much elongated. — 1662, 4 sp. ventricose.—1663, 
2 do. ribs distant.—1664, 4 do. ribs close.—1665, 2 do. abnormal 
growth.—1666, 6 young sp. ribs very fine.—1667, 6 young sp., 
P. apicina, W/e.—1688, 6 do. elevated, approaching L. Philippi. 
—1669, 3 separate opercula (others in their shells.) 
Tablet 1670 contains 3 very young Litorine, the smallest 
‘03 by 024, the largest ‘088 by *055, probably belonging to 
this species, but too young to identify with confidence without 
a series. 
398. Lirorina PHILIPPII, x. s. 
L. t. inter “I. asperam” et “LD. zie-zac” intermedia; parvéd, 
compacta, interdum elevaté, plerumque gibbosd ; anfr. subplan- 
atis, ad basin angulatis ; colore livido, seu olivaceo-livido, 
olivaceo-fuscd oblique strigatd; lineis irregularibus, interdum 
zre-zac-formibus, interdum interruptis, tesselatis: totd super- 
Jicie nitentiore, sulcis subdistantibus subimpressis ornatd ; colu- 
mella excavatd ; intus fused, margine acuto labri plus minusve 
lineato; nucleo plerwmque eroso; operculo tenuiore, latiore ; 
intus nucleo vie elevato ; imp. musc. minutissime scabro, lineis 
increment conspicuis, suturd spirali haud celatd. 
This unpretending little species may be the L. aspera, var. 
“more slender, sculpture reduced to spiral impressed lines” 
of Prof. Adams. It may also form a part of the L. apicina of 
Menke; but as its usual character is just the contrary of his 
diagnosis, being almost always eroded even in very young 
specimens, it would have been scarcely truthful to retain the 
name which he provisionally gave, apparently to the young of 
L. aspera. The markings in this species, (which in L. conspersa 
are purplish brown dots, and in L. aspera umber spots) are 
olive brown, almost always in slanting lines more or less 
interrupted ; and when broken up into dots, these are always 
square, tesselating the spaces between the spiral lines. It is 
Oct. 1856. 99 
