the Trondhjem Fiord. 359 



narrower in form than the next, c : these specimens are abso- 

 lutely identical with those of d^ and are the form figured by 

 Jeffreys, 1884, fig. 3, except that the spiral riblets are on all 

 parts of the whorls ; c and d have not the labial rib so well 

 developed, as is admirably figured by Sars (fig. 5 c), with 

 whose figures e, /, and^ exactly correspond, h are some of the 

 original specimens of the form dredged by Forbes and Mac- 

 Andrew and figured in the ' British Mollusca ; ' they differ 

 from Norwegian and Mediterranean specimens, as Forbes and 

 Hanley's figure shows, in the more conical outline, much 

 less swollen and almost flat volutions, and less expanded 

 mouth. The Norwegian form I therefore consider should be 

 called Alvania suhsoluta^ Ar., and the Loch-Fyue form 

 Alvania subsoluta, Ar., var. ahyssicola, Forbes. 



The Kattegat examples are interesting, intermediate be- 

 tween the British and Norwegian forms, though perhaps 

 nearer to the former. 



The particular specimen of A. subsoluta figured by Jeffreys 

 (1884, fig. 3) is represented as having spiral riblets only on 

 the lower half of the whorls. One of ray Trondlijem-Fiord 

 examples has no spiral riblets except on the last whorl, and 

 another has the upper whorls without riblets, while on the 

 penultimate whorl they are, as in Jeffreys's figure, confined 

 to the lower half. 



53. Onoha striata^ Adams. 



A few specimens of the typical form. 



54. Velutina Icevigata, Penn. 

 Trondhjem and Rodberg. 



55. Lamellaria latens, Mliller. 

 Rodberg, 40-70 fath., one specimen. 



56. Lunatia groBnlandica, Beck. 



Two or three small specimens, 150 fath., Rodberg. 



57. Lunatia Montagui, Forbes. 



Shallow water, Trondhjem and Rodberg. 



58. Scalaria grosnlandica, Perry. 



Only one specimen, Rodberg, about 20 fatii. 



59. Aclis exigua^ G. O. Sars. 



One living specimen, 250-300 fath., Rodberg. 



60. Eullma intermedia^ Cantr. 



Rodberg and Trondhjem, down to 300 fath. 



27* 



