388 MAZATLAN UNIVALVES 



Hob Gulf of Nicoya ; Puerto Portrero ; in 12 fm. coral 

 sand ; Cuming, Hinds. Mazatlan ; Menke. Do. ; common ; 

 L'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. 



SUBGENUS EUEYTA, H. $ A. Ad. 



Gen. vol. i. p. 225. Shell with a false umbilicus, caused by the 



twisting of the columella. 

 Buccinum, pars, Lam. 



455. EUEYTA FULGUEATA, Phil. 



Phil, in Zeit.f. Hal 1846, p. 53, no. 23. Menke in do. (diagn. 



emend.) 1847, p. 181, no. 14. 

 Euryta fulgurata, If. Sf A. Ad. Gen. i. 225. 

 =Terebra arguta, Gould, Hex. fy Cal. Shells, p. 7, pi. 14, f. 19, 



Shell very small, slender, with a variable number (12 18 in 

 each whirl, Mke.) 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 striae. Mouth rather elongate. 

 lip not undulated, base strongly notched, displaying the false 

 umbilicus. Colour extreme^ 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. 

 Hob. Mazatlan, Philippi. Do. Melchers, Menke. Do. ; 



common, L'pool Col* 



* Two shells in the British Museum from E. Africa, Capt. Owen, marked "T. 

 aciculata, Gh-a.y," do not display any character? by which they can be separated 

 specifically. 



