502 MAZATLAN UNIVALVES 



in the I/pool Col. (except a very few which I had secured 

 before the fatal act) were, in spite of my earnest entreaties, 

 subjected to the acid decorticating process for drawing-room 

 purposes. I saw a large box of specimens, in the yard of a 

 London dealer, rapidly approaching the same result by expo- 

 sure to the weather. Opeiculum long, thin, narrow, ungui- 

 culate, nearly straight, rather concave externally : ridges of 

 growth shewing through on the large inner attachment.* 



The young shell has the spire more or less exserted, stoutly 

 nodulous, with the whole surface finely spirally striated : 

 posterior canal rudimentary ; anterior do. very long. The 

 largest sp. measures long. 8 '7, long. spir. '2, lat. 6' 8, div. 140. 

 Hob. Acapulco, Humboldt fy Bonpland. Bay of Caraccas ; 



on mud banks ; Cuming. Bay of Panama, C. 22. Adams. 



Mazatlan ; fine and abundant ; L'pool fy Havre Coll. 



Tablet 2408 contains 4 sp. very young : the smallest is 1*7 

 by '9 ; another retains its operculum. 2409, 3 sp. adolescent; 

 the first quite smooth, blackish brown, with one broad white 

 peripheral band, and about 12 narrow lines near the base ; the 

 second brownish black, with extremely numerous very fine 

 white lines in the middle, and a few rudimentary shoulder 

 knobs ; the third well tuberculated, very light brown, with 

 white band and lines, dark at the back of the canal. 2410, 2 sp. 

 adult : the first begins banded, without tubercles, and ends 

 of a uniform blackish brown, tuberculated ; the other has two 

 very narrow white bands, and has commenced tuberculating 

 after a serious accident to its posterior canal. 2411, the largest 

 sp. with its epidermis, partially covered with Bryozoa. 



FAMILY MUEICID^. 



GENUS F U S U S , Brug. 



Enc. Meth. p. xv, no. 45. Phil. Handb. Conch, p. 139. 

 H. fy A. Ad. Gen. vol. i. p. 78. [Non Fusus, (Humph.} 

 Gray, in Proc. Zool. Soc. 1847, p. 132.] 



Colus, (Humph.) Gray, in Proc. Zool. Soc. 1847, p. 135. 



639. Fusus PALLIDUS, Brod, fy Sow. 



Zool. Journ. vol. iv. p. 378. Zool. Beech. Voy. p. 117, pi. 36, f. 14. 

 = Pyrula lignaria, Rve. Conch. Ic. pi. 9, sp. 12, f. 13, a b, teste 

 Hani. 



* None were found of the large ghells^ v. Fasciolaria princeps, p. 459, note. 



