518 MAZATLAN tTNIVALVES 



663. PiSANIA EINGENS, Rve. 



Buccinum ringens, Rve. Conch. Ic. pi. 7, sp. 45. — C. B. Ad. 



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



p. 59.) 

 (Cantharus) Tritonidea ringens, S. Sf A. Ad. Gen. i. 85. 



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

 in tlie inconstancy of its cliaracters. Of the tliree Mazatlan 

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

 second is intermediate, the third nearly as ringent as Reeve'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, div. 70°. 



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



Sah. — 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, 

 Genxjs MUEEX, Linn. 



664. MUEEX PLICATUS, Sow. 



Proc. Zool. Soc. 1810, p. 139 -.— Conch. III. p. 2, sp. 15, f. 6.— 

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

 pro 87 bis ; non sp. 97 pi. 21.) 



? = Murex unidentatus, lU-e.* in Zelt. f. Mai. 1850, p. 186, 

 no. 66 ; (non Sow. Conch. Ill.,{. 52.) 



Comp. M. ternispiua, Mke.* loc. cit. no. 67 ; (P non Lam.) 



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

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

 those on the spire are voxy short. Long. 2 "3, long. »pir. '65, 

 lat. 1-3, cZjy. 80". 



Hah. — Gvdf Nicoya ; in coarse sand, 12 fm. Cuming. — Mazat- 

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



Tablet 2-166 contains the specimen. 



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

 liis Moll. Kov. lIoU. no. 100, as M. crasswpina. This and his M. ternispiua are 

 probably either varieties of M. plicatus, oi iujported from his purchased box, as 

 , both the original species are E, ludiiui. 



