MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 1/3 



5. Pleurotoma reticuldtum. Reticulated Pleurotoma. 



Shell oblongo-fusiform, thin ; with the spire tapering to a 

 rather obtuse point, and somewhat convex in outline ; the 

 whorls slightly angulate at the upper part, giving the spire 

 somewhat of a scalar appearance, but with the space between 

 the angle and the suture convex and sloping ; the last whorl 

 of rather less breadth than the length of the spire ; the suture 

 distinct ; the whorls with numerous transverse narrow ribs, on 

 the last dividing into several raised lines, and on all reticulated 

 with longitudinal raised lines; the aperture oblong, narrow, 

 deeply sinuate at the suture, with the outer lip thin, the canal 

 very short, the inner lip with a rather thick, smooth layer ; the 

 colour dull white. Length half an inch, breadth a third of 

 the length. 



A single specimen sent by Mr. Alexander Murray, who 

 found it at Slains, in November, 1 842. 



Pleurotoma reticulatum. Brown, Illustr. PI. 38. f. 43, 44. 



GENUS 3. R/OSTELLARIA. 



Animal with the body elongated, spiral ; the head 

 with two conical tentacula, bearing the eyes on a pro- 

 minence at their base externally ; the mouth at the end 

 of a long cylindrical annulated proboscis, and a filiform 

 tongue ; mantle forming a thin-edged flap over the 

 branchial cavity, and on the left side an elongated open 

 canal, which emerges by a groove in the shell ; branchiae 

 two, unequal, pectinate ; foot large, generally broad ; a 

 horny operculum. 



Shell more or less turrite or fusiform, spiral ; its 

 aperture oblong, with a prolonged canal for the respi- 

 ratory tube, and the outer lip much expanded in old in- 

 dividuals, entire, dentate, or digitate. 



1. Rostelldria Pes-pelecdni. Pelican* s-foot Rostellaria. 



Shell turrite, with the spire tapering to a point, the suture 

 distinct, the whorls ten, convex, with a medial series of oblique 

 compressed obtuse nodules, and fine spiral striae, the last 

 whorl with two additional nodulose bands, the lower smaller 

 and approximated ; the aperture oblique, oblong, with the 

 outer lip extremely dilated, angulate, very thick, sinuated 

 P2 



