178 MAZATLAN UNIVALVES 



Tablet 811 contains a sketch of a solitary specimen which 

 was found by Mr. Archer among the small shells. It was 

 referred by Mr. Cuming to Bulinus Broderipii, Soto, in Proc. 

 Zool. Soc. 1832: — Conch. HI. f. 1. ( = Plectostjlus Broderipii, 

 H. Sf A. Ad. Gen. ii. 155 :) but as it does not accord with the 

 figures of that Chilian species, it was perhaps an oversight. 

 Lamarck's description might also serve for B. Ziegleri, which 

 this shell very greatly resembles. It is however more inflated 

 and thinner. Long. '65, long. spir. "35, lot. "4. 



Hah. — Mexico, HumhohU Sf Boitpland- — ? Mazatlan ; 1 sp. 

 with B. Ziegleri ; L'pool Col. 



Okdee LIMXOPHILA. 



Faitily AUEICULIDyE. 



Genus MELAMPUS, Montf. 



Melampus, Monlf. Conch. Si/st. 1810. 



Conovvdus, Lam. 1812. This genus was afterwards suppressed 

 by its author, and united to Auricula. 



235. Melampus olivaceus, n. s. 



M. t. parvd, suhlavi, conoided, spira depressa, infra suturam 

 indistincfam obscure angulatd ; alhidd, fusco-purpureo irregu- 

 lariter tessellatd, epidermide adhcsrente olivaced indutd ; anfr. 

 vii. vix monstrantibus, planatis ; aperturd longd, angiistd, ad 

 narginemfusco-purpured, intus albd ; labro ad marginem acuta, 

 intus dentaio, deniibus in liras acufas, in aduUd sa^pe obsoleta.^, 

 decurrentibus ; lahio tcnui, plied und parietali transversa, inter 

 dentictdas duas sitd, in juniore denti cults numerosis intus 

 canditis ; columella plied und obliqtid, ad basin exeurrente ; 

 parietibus internis in adultd absorptis. 



Melampus bidentatus, Moerch in Mus. Cum. : non Sat/. 



Moerch must surelj' have been in error in regarding this 

 species as a variety of ]M. bidentatus. It is much more nearly 

 allied to the Voluta coffea of Linn. The specimens, of which 

 many hundreds were sent, are very constant in the characters 

 above given ; of which the most distinguishing are the oUve 

 green epidermis, with the irregular purplish brown tessellated 



