mazatlan ttnivalves 457 



Family FASCIOXAEIAD.E. 



Genus LATHTRUS, Montf. 



Conch. Syst. vol. ii. p. 531. This genus includes the turrited 

 species, usually ranked with Turbinella, and intermediate 

 between that genus and Fasciolaria. 



Latirus, K. Sf A. Ad. Gen. vol. i. p. 152. 



582. Lathietjs ceeatus, Gray. 



Murex ceratus, Gray, in Wood, Ind.. Test. Suppl. pi. 5, f. 15. 

 Turbinella cerata, Gray in Grijf. An. King. Moll. pi. 41, 

 f. 5 : — Zool. Beech. Voy. p. 114. — Kien. Icon. Conch, p. 25, 

 no. 16, pi. 16, f. l.—Rve. Conch. Ic. pi. 7, sp. 37. 

 Latirus ceratxis, H. Sf A. Ad. Gen. i. 152. 



This shell is rightly described by Kiener as having 3 ijlaits, 

 but is figured by him with four, and hj Eeeve (number not 

 stated) with five. The young shell is rather moj-e turrited 

 than L. tiiberculatus, Brod. fProc. Zool. Soc. 1833, p. 7 : Kien. 

 no. 17, pi. 16, f. 2:~Eve. pi. 8, sp. 12) also brought from 

 Mazatlan by the same traveler ; and its colour is uniform : 

 else the two species are closely allied, although Messrs. Adams 

 place the latter in another genus, (Peristernia tuberculata, 

 i. 154.) The young shell is more distinctly grooved within 

 than the adult ; with a parietal tooth near the suture, and a 

 labial tooth which may have been mistaken for a i^lait. The 

 adult measures loncf. 3*, long. spir. l*o5, lat. loZ, div. 45". 

 Rah. — Mazatlan, Bupetit-TIiouars.—GralsL^gigos ; under stones 

 at low water ; Cuming. — Taboga and Panama ; do. and m 

 crevices of rocks, 12 sp. ; C. B. ^c^aw^.— Mazatlan : ex^ 

 tremely rare ; L'pool Col. 



Tablet 2079 contains the largest specimen. 



Genus LEUCOZONLl, Gray. 



P;-oc. Zool. Soc. 1847, p. V^G.-H. 8f A. Ad. Gen. vol. i. p. 154. 

 Turbmella and Monoccros, pars, auct. 



583. Leucozonia cingulata. Lam. 



Monoceroscingulattim, ia7«..4??..?. Vert.\o\.x p 118 no 1—^ 

 :Enc. MMh. pi. ,396, t'^.-Sow. Gen. i.i -.-Conch.' HI Cat 

 no. \.—Rve. Conch. Syst. pi. 261, f. 4 -.—Conch. Ic. pi 3 



J an. 19^7. 



