380 MAZATLAN UNIVALVES 
Famity CANCELLARIAD. 
Genus CANCELLARIA, Lam. 
445. CANCELLARIA URCEOLATA, Hinds. 
Proc. Zool. Soc. 1843, p. 47 :— Voy. Sulph. Moll.§p. 41, no. 171, 
pl. 12, f. 7, 8—Sow. Thes. Conch. p. 443, no. 13, pl. 94, f, 48. 
Cancellaria obesa, P. P. C. Cat. Prov.; non Sow. 
?’=Cancellaria ovata, Whe. in Zeit. f. Mal. 1850, p. 181, no 51; 
non Sow. 
The character by which Mr. Hinds distinguishes this species. 
that the nail is not obstructed when drawn in the direction of 
the axis, is by no means constant. There was considerable 
variation in about 50 specimens examined. Shell sometimes 
with spire depressed, resembling C. obesa; sometimes very 
prominent. Cancellations c!ose and conspicuous on the early 
whirls, (the first 3 being smooth, deciduous,) afterwards very 
variable. Two sp. of nearly the same size have the ribs two to 
one. Spiral lines more or less expressed. The plaits have a 
slight callus below, near the termination of each, giving them in 
some positions a sub-bifid appearance. Sometimes there is a 
shght parietal tubercle. Labrum with 8-10 lire inside. A young 
broad sp. measures long. °77,:long. spir. °3, lat. °52, div. 70°. 
An elevated sp. 55 Me 24e TOR ao ha ee Oe 
The largest sp. elas 3, tdi eon seenOUes 
Hab—West Coast America, between 12°3° and 21°5° N. Lat: 
viz. Gulf of Papagayo, 8-14 fm.; San Blas, 7 fm. Hinds.— 
Mazatlan; very rare ; L’pool Col. 
Tablet 1813 contains 4 sp. exhibiting extremes of variation. 
446. CANCELLARIA GONIOSTOMA, Sow. 
Proe. Zool. Soc. 1832, p. 51 :— Conch. Ill. no 47, pl. 13, f. 43 :— 
Thes. Conch. p. 427, no. 64, pl. 94, f. 40.—Miull. Syn. Nov. 
Test. Viv. p. 73.—Mke. in Zeit. f. Mal. 1850, p. 181, no. 53.— 
C. B. Ad. Pan. Shells, p. 134, no. 157. 
Comp. Cancellaria costata, Gray, Sow. Thes. Conch. sp. 60, 
p. 456, pl. 95, f. 60, 61; pl. 96, f. 103: +C. rigida, Sow. 
(Gambia.) 
Comp. C. brevis, Sow. Conch. Ill. f. 33:—Kien. Icon. Conch. 
p. 14, no. 9, pl. 7. f.2. (Patagonia, Kiener.) 
