518 MAZATLAN UNIVALVES 



663. PlSANIA BINGENS, Eve. 



Buccinum ringens, Hve. Conch. Ic. pi. 7, sp. 45. C. J5. Ad. 



Pan. Shells, p. 71, no. 63. (Non Phil, in Zeit.f. Mai. 1851, 



p. 59.) 

 (Cantharus) Tritonidea ringens, H. fy A. Ad. Gen. i. 85. 



This species (if it prove such) differs from P, sanguinolenta 

 in the inconstancy of its characters. Of the three Mazatlan 

 specimens, one would pass for a dead P. sanguinolenta, the 

 second is intermediate, the third nearly as ringent as Heeve's 

 figure. They have 9, 10 and 11 tubercular ridges respectively. 

 Spire rather more depressed : infrasutural tubercles stronger, 

 with the depression narrower : labral serrations not projecting : 

 canal more twisted : mouth white : warts fewer, in two irregu- 

 lar rows, of which the inner are elongated. The more typical 

 sp. measures long. '84, long. spir. *19, lat. '64, dw. 70. 



The aberrant sp. 1'12, '37, '76, 60. 

 Hob. Panama; on rocks at low water ; Cuming. Do.; 



under stones near low water of neap tides, common ; 



C. -B. Adams. Mazatlan ; 3 dead sp. ; L'pool Col. 



Tablet 2465 contains the two specimens above measured. 



GENUS MTJBEX, Linn, 



664. MUBEX PLICATUS, Sow. 



Proc. Zool Soc. 1840, p. 139 : Conch. HI. p. 2, sp. 15, f. 6. 

 Eve. Conch. Ic. sp. 87, pi. 21, f. 87 : (non pi. 22, f. 87, sp. 97 

 pro 87 bis ; non sp. 97 pi. 24.) 



?=Murex unidentatus, Mice* in Zeit. f. Mai. 1850, p. 186, 

 no. 66 ; (non Saw. Conch. III. f. 52.) 



Comp. M. ternispina, Mice* loc. cit. no. 67 ; (? non Lam.) 

 Only one dead specimen of this shell was found. It is 



remarkable for the long spines on the base and canal, while 



those on the spire are very short. Long. 2 '3, long. spir. '65, 



lat. 1'3, div. 80. 



Hal. Gulf Nicoya ; in coarse sand, 12 fm. Cuming. Mazat- 

 lan ; one dead sp. ; L'pool Col. 

 Tablet 2466 contains the specimen. 



* Mente says of his M. unidentatus, that it is the shell quoted by him in 

 his Moll. Nov. Soil, no. 109, as M. crassispina. This and his M. ternispina are 

 probably either yarieties of M. plicatus, or imported from his purchased boK> as 

 both the original species are E, Indian, 



