174 Panama Shells. LITTORINID^E. 



238. Littoriiia (?) megasoma. Nov. sp. 



Shell obliquely ovoid : dingy white : with eight or nine small 

 spiral ridges, of which three are seen on the spire ; with very 

 coarse deep regular transverse strias : apex acute : spire very 

 small, with the outlines nearly rectilinear : whorls three, angu- 

 lar, with an excavated suture : last whorl very large and 

 obliquely dilated : aperture subelliptical, with the margin con- 

 tinuous and thin : umbilical region well defined by the ante- 

 rior spiral ridge, well excavated, and forming with the umbilicus 

 a funnel-shaped pit. 



Mean divergence about 135 ; length .09 inch ; breadth .09 

 inch ; length of spire .035 inch. 



This species also is referred to Littorina with much hesitation : 

 it approaches Narica more nearly than any of the species which 

 we have mentioned as resembling that genus. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 



1 specimen was found in the sand. 



239. Littoriiia parvula ? 



Synonymy. 



? Littorina parvula Phil, in Zeitschr. Malak. vol. for 1848. 



p. 149. - March 1849. 



If our shell is distinct from Philippi's species, it may take 

 the name of L. dubiosa, with the following description. 



Shell conoid : blue, whitish next below the suture and an- 

 teriorly, with oblique brown bars on the whitish parts ; very 

 dark brown inside, spotted with brown and white in the labrum : 

 with several impressed spiral lines, which are more or less indis- 

 tinct on the spire and on the middle of the last whorl, and of 

 which one next above the angle of the last whorl is deeper : 

 apex subacute : spire with the outlines moderately curvilinear : 



