190 MALACOZOA. GASTEROPODA. TECTIBRANCHIATA. 



The only specimen seen by me, and which is in my collec- 

 tion, was presented to me by one of my pupils, Mr. James 

 Smith, in the Spring of 1842. It was brought up from deep 

 water, off Aberdeen, by one of the fishing-lines. 



Although most closely allied to Halia helicoides of Risso : — 

 Hist. Nat. des principales Productions de I'Europe ]SIeridionale, 

 iv. 2. PI. 6. f. 79. it differs specifically, that shell being de- 

 scribed as " opaca, anfractibus quinqvie, striis transversis (non- 

 nullis antiquatis) sculptis," and according to the figure having 

 the spire narrower, the canal longer, and the striae more distinct. 

 That species is stated to be an exanunate denizen of the 

 *' Argile tertiaire de Magnan." 



This being one of the most interesting additions that could 

 be made to our Scottish Fauna, I have thought it worthy of 

 being dedicated to one who by his many discoveries has added 

 so much to our knowledge of nature, and who is tlie only Ma- 

 lacologist personally known to me in the north of Scotland. 



Neither it nor Risso's Halia helicoides have any affinity to 

 Natica helicoides of Dr. Johnston. Every naturalist to whom 

 I have shewn it, has suspected it to be a young Fusus or Buc- 

 cinum, to which it bears that general resemblance which a 

 cow has to a sheep. 



Genus 4. Bullina. 



SlieU internal, cylindrical, convolute, with tlie aper- 

 ture very narrow^ a little wider anteriorly, the outer lip 

 very thin, the place of the spu'e occupied by a cavity. 



1. Bullina umhilicdta. Oblong Bullina. 



Shell oblongo-cylindrical, thin, semitransparent, glossy, 

 with faint growth-lines; the left extremity rounded, with a 

 deep and narrow umbilicus ; the aperture extending the whole 

 length, very narrow for more than half, then oblong, the outer 

 lip thin, extending slightly beyond the margin of the spiral 

 depression, the columella visible for a fourth of its length, and 

 there reflected; the colour white. Length an eighth of an 

 inch. 



Found by me in shell sand from the beach near Aberdeen ; 

 also in shell sand from Crudcn Bay, sent by Mr. Mm-ray. 



Bulla umbilicata. Mont. Test. Brit. PI. 7. f. 4.— Bulla uinbili- 

 cata. Turt. Couch. Diet. — Bulla umbilicata. Flem. Brit. AuioK 

 293. 



