MARSHALL: ADDITIONS TO 'BRITISH CONCHOLOGY.' 259 



in 62 fathoms. It has a calcareous operculum, and the 

 umbilicus is closed by a thickened continuation of the 

 inner lip. It has a very wide distribution — ' Circumpolar 

 and Arctic seas in the Atlantic and Pacific, Iceland, 

 Faroe, Norway, Labrador, Gulf of St. Lawrence, New 

 England, Siberia, Sea of Okhotsk, Aleutian Isles, and North 

 Japan ' (Jeffreys). Like JV. islandica and N. gra'nlaftdica 

 this attains a large size in northern latitudes. I have 

 specimens from Nunivak, in the Behring Sea, \\ in. by 

 -i\ in. The var. elatior of Moller lives in the Faroe Channel. 



Aporrhais serresianus Michaud. This species may now 

 be added to the British List, living as it does on the western 

 coast of Ireland and the eastern coast of Shetland. 

 Jeffreys' description of A. maca7idrece may be taken as that 

 of A. serrcsuuius except as to size, the former being merely 

 a dwarf form of the latter. A. macatidre.e thereby becomes 

 A. serresianus var. macatidrece. 



Cerithiopsis tubercularis var. albescens Marsh. (See 

 'Journal of Conchology' for April, 189 1). Scilly and 

 Guernsey. 



C. tubercularis var. scalaris Monterosato. Shell more 

 conical, whorls turreted as in Odostomia scalaris. Scilly 

 Isles, 40 fathoms. 



C. tubercularis var. acicula Brusina. Shell forming a very 

 slender obelisk, the base not being contracted as in the 

 type, nor do the apical whorls suddenly narrow ; tubercles 

 smaller and closely set together ; suture slight. Length, 0*2 ; 

 breadth, 0*04. Scilly Isles, 40 fathoms. 



C. concatenata var. lactea Marsh. (See 'Journal of Con- 

 chology ' for April, 1891). 



C. metaxae var. angustissima Forb. Longer and slenderer 

 than the type. Scilly, 40 fathoms ; Plymouth Sound. My 

 specimens are a quarter of an inch long, and less than half 

 the width of the type. 



