CONTRIBUTIONS TO CONCIIOLOGY. 



NO 5. 



Descriptions of supposed new species of Marine Shells, which 

 inhabit Jamaica. By C. B. Adams, 1850. Continued from p. G8. 



Phasianella concinna. Shell broad ovate, or ovate conic : 

 with numerous well defined dots of opaque reddish brown on a sub- 

 transparent ground of very pale red or brosvn, the dots being less 

 numerous and less uniformly sprinkled on the upper part of the 

 whorls : surface well polished : apex rather obtuse : spire with quite 

 convex outlines : whorls four, quite convex, with a well impressed 

 suture : aperture ovate-orbicular, with its plane very oblique to the 

 axis of the shell : labrum much curved : with an umbilical groove 

 parallel to the labrum. 



Mean divergence about 60°; length of spire .07 inch; total length 

 .14 inch ; breadth .1 inch. 



Trochus pulcher. Shell conical, much elevated : pale claret 

 color, with a dark brown apex, and large ill defined spots of white ; 

 with spiral series of minute dark red oblong spots, which are propor- 

 tioned to the size of the spiral ridges on which they are placed ; the 

 ridges of least size are not spotted : solid, with ten or twelve minute 

 spiral ridges, of which one near the base of the whorls is larger, and 

 three are of an intermediate size, viz., one on each side of the suture 

 and one on the middle of the whorls ; on the lower side of the last 

 whorl are sixteen or eighteen other minute revolving ridges, of which 

 every second or third is spotted : apex acute : spire with the outlines 

 nearly rectilinear : whorls seven and one-half, a little concave, acute- 

 ly prominent in the lower part ; last whorl subangular, moderately 

 convex beneath : aperture subquadrate, iridescent within : columella 

 subtruncate : umbilicus wanting. The whorls in this shell have the 

 same form as in T. jujuhinus^ and the general form of the shell is 

 like that of T. pyramidatus. 



Mean divergence 48'^; length of spire .26 inch; total length .38 

 inch ; breadth .27 inch. 

 4 



