388 MAZATLAN UNIVALVES 
Hab.—Gulf of Nicoya ; Puerto Portrero ; in 12 fm. coral 
sand; Cuming, Hinds.—Mazatlan ; Menke.—Do.; common ; 
‘pool Col. 
Tablet 1839 contains 6 sp. different ages, olivaceous ashy 
tint.—1840, 6 sp. rich olive.—1841, 3 sp. tint changing.—1842, 
2 sp. black brown.—1843, 5 sp. black fading into blue.—1844, 
5 sp. dark lustrous shade.—1845, 1 sp. olivaceous, spire inter- 
rupted by breakage.—1846, 2 sp. dark, spire deformed, do.— 
1847, 2 sp. with opercula, one in situ, the other loose. 
Suscenus EURYTA, H. § A. Ad. 
Gen. vol. i. p. 225.—Shell with a false umbilicus, caused by the 
twisting of the columella. 
Buccinum, pars, Lam. 
455. Euryta FuLeuRATA, Phil. 
Phil. in Zeit. f. Mal. 1846, p. 53, no. 23.—Menke in do. (diagn. 
emend.) 1847, p. 181, no. 14. 
Kuryta fulgurata, H. & A. Ad. Gen. 1. 225. 
=Terebra arguta, Gould, Mex. §& Cal. Shells, p. 7, pl. 14, f. 19. 
Shell very small, slender, with a variable number (12—18 in 
each whirl, We.) of fine sharp ribs (not nodose) often running 
in lines from the apex to the base ; interspaces elegantly 
undulated, shining and smooth except near the base where 
there are some very fine spiral strie. Mouth rather elongate, 
lip not undulated, base strongly notched, displaying the false 
umbilicus. Colour extremely variable; generally of a very 
light brownish tinge, elegantly penciled with reddish brown in 
irregular undulated markings, and a brown spiral line border- 
ing the notch; often without pencilings, of a uniform white, 
orange, or brownish purple, or with a light or dark band near 
the suture ; very frequently changing in pattern and colour at 
different ages. The first three whirls are smooth, and with 
the rest are slightly convex ; suture distinct. Spire very fre- 
quently covered with nearly round egg cases. Long. ‘74, 
long. spir. °46, lat. °2, div. 23°. 
Hab—Mazatlan, Philippi.—Do. Melchers, Menke.—Do. ; 
common, L’pool Col.* 
* Two shells in the British Museum from EK. Africa, Capt. Owen, marked ‘‘T. 
aciculata, Gray,’ do not display any characters by which they can be separated 
specifically. 
