208 Panama Shells. AUBIOULID^. 



AURICUIiA. — Eight species of this genus were found, 

 and two of these occurred abundantly ; but we have been 

 able to determine only two of the less common species. The 

 number of known species in the genus is very considerable, yet 

 very few appear to be known which belong to the same zoolo- 

 gical province in whicb Panama is situated. Two rather large 

 species were collected by Mr. Cuming in West Columbia, and 

 were described by M. Petit in the Proc. Zool. Soc. Lond. 1842. 



309. Auricula acuta. 



Synonymy. 



Auricula acuta Orb. in Guerin Mag. Zool. p. 23. 1835. 



Orb. Voy. Amer. Merid. Moll. p. 326. pi. 42. 



f. 4-6. - ... 1840. 



Marinula Recluziana Cuming in sched. 1852. 



Station.— ]^eax brackish water ; M. Fontaine I Orbigny. 

 Under stones near high water mark. 



Habitat.— 'S&&T Guayaquil ; M. Fontaine I Orbigny. 



West Columbia ; Cuming I in scbed. 



Panama : C. B. A. 1 

 Only 1 mature and 2 young specimens were obtained. 



310. Auricula concinna. Nov. sp. 



Shell ellipsoidal : blackish brown, paler on the convexity of 

 the last whorl, with a yellowish white spiral band on the last 

 whorl issuing from beneath the suture ; with the plaits and 

 callus in the aperture white : smooth and shining : apex acute : 

 spire with the outlines very curvilinear : whorls five, convex, 

 imbricately appressed, with the suture moderately impressed ; 

 last whorl long ; aperture narrow and very acute above, much 

 contracted by the plaits : labrum sharp, in the lower part much 

 thickened within by a broad thick deposit : plaits three, of which 

 the lower one is very oblique, and the upper one is very large, 



