MAIACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 327 



1 . Turhdnilla reticulata. Reticulated Turhonilla. 



Shell turrite, acuminate, with about twelve convex 

 reticulated turns ; aperture subovate, subangulate an- 

 teriorly, inner lip straight, reflexed, outer lip crenulated 

 by the spiral grooves. Reticiddtiis, marked like net-work. 



The only specin^en obtained is scarcely half-grown, and has 

 but eight volutions, whicli are rounded, and marked with four 

 strong spiral ridges, crossed by transverse grooves ; the suture 

 distinct; the last turn proportionally large, without strijB on 

 its anterior part, the spire tapering to a very fine point; the 

 aperture subovate, with the inner lip nearly straight, a little 

 reflexed, and leaving exposed a small umbilicus, the outer lip 

 thin, somewhat crenated by the spiral grooves, and at its junc- 

 tion with the inner forming a rounded angle, or slight canal ; 

 the colour reddish-brown, becoming paler toward the apex. 

 Length two-twelfths of an inch, breadth three-fourths of a 

 twelfth ; but it attains the length of half an inch or more. 



Found by me among shell sand from Ugie-mouth, sent by 

 Mr. Alexander JVIurray, in December, 1842. 



Muvex reticulatus. Mont. Test. Brit. 272. — Cerithimn reticula- 

 tum. Brown, lUustr. PI. 48. f. 63. 



Genus 8. Rissoa. P. 56, 149. 

 14. Rissoa pzinctitrdta. Pwictiired Rissoa. 

 Shell ovato-conical, of five or six very convex, thin, 

 semitransparent, glossy turns, marked with transverse 

 and spiral ridges, leaving in their interstices spiral scries 

 of depressed dots ; aperture ovate. Puncturdt^is, marked 

 with small impressions. 



Shell ovato-conical, of five or six well-rounded turns, which 

 are thin, semitransparent, glossy, finely reticulated with trans- 

 verse and spiral striae, more conspicuous near the suture, and 

 forming at their intersection small impressions of a squarish 

 form ; the spire rather obtuse ; the aperture ovate, rather 

 rounded behind, w-ith the outer lip somewhat thickened exter- 

 nally, the inner scarcely reflexed, leaving a slight groove be- 

 hind ; the colour hyaline, with three reddish bands toward the 

 outer lip ; or destitute of markings. Length a twelfth of an 

 inch, breadth half the length. 



Found by Miss Anne Macgillivray, in sand, from Stone- 

 haven, procured by Mr. Alexander Mitchell, in December, 



