MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 12/ 



Plentiful oiF Aberdeen and Peterhead, at Gamrie and Banff; 

 sometimes cast on the beaches ; very frequently brought up on 

 the lines, but usually the shells only, containing Paguri. 



Natica glaucina. Var. B. Turt. Conch. Diet. — Natica Alderi. 

 Forbes, Malacol. Men. 31. — Natica Alderi. Johnst. Berw. Trans, 

 iii. 266. 



4. Natica nitida. White Natica. 



Shell ovato-globose, rather thick, highly glossed ; with the 

 spire very short, and rather acute ; the turns five, faintly stri- 

 ated transversely, flattened toward the margin, so that those on 

 the spire are but slightly convex, with the sutm-e inconspicuous ; 

 the last turn ventricose ; the mouth oblique, semicircular ; the 

 outer lip thin, forming at its jvmction an acute angle filled by 

 callus, the inner partly covering and narrowing the longitu- 

 dinally striated umbilicus wdth a mass of callus ; the colour 

 milk-white, with a band of more opaque white margining the 

 whorls, and another encircling the umbilicus. Length four- 

 twelfths of an inch) breadth three-twelfths. 



This species is very closely allied to Natica Alderi, from 

 which it differs in being less ventricose, with the spiral turns 

 flattened, and the colom* white, without any markings. It 

 differs from Natica Mammilla in many respects. 



A single specimen found by me, in a fishing-boat, at Bod- 

 dam, near Peterhead, on the 5th of August, 1842. 



Nerita nitida. Donov. Brit. Shells. 144. — Nerita nitida. Mont. 

 Test. Brit. Suppl. 149. — Natica nitida. Flem. Brit. Anim. 319. 



5. Natica helicoides. Helicine Natica. 



Shell ovate, thin, covered with a delicate epidermis ; of four 

 turns, which are convex, separated by a canalicidate suture, 

 and obsoletely striulate transversely and longitudinally; the 

 spire short, convex, rather obtuse ; the mouth oblique, ovate, 

 rather angulate anteriorly, the outer lip thin, the inner con- 

 tinued over the columella, but very thin, and leaving a narrow 

 fissure in the umbilical space, on which there is no callosity ; 

 the colour white, that of the epidermis yellowish-white. 

 Length four-twelfths of an inch, breadth a fourth less. 



The above description is taken from a specimen which I 

 found, on the 5th of August, 1812, in a fishing-boat, at Bod- 

 dam, or Buchan-Ness, near Peterhead. The shell is quite 

 perfect, and is identical with a fossil shell found by Mr. Lyell, 

 in the Norwich Crag. It has be, n described by Dr. John- 



