232 JORDAN: ON THE GENUS PUStTS. 



elegant species ; specimens of each variety will be sent to the 

 Natural History Museum at South Kensington for reference. 



I. — F. gracilis var. Belliana, Jordan. — This variety differs 

 from the type in the following particulars : — It attains 

 larger dimensions, two of my specimens being 3" 75 inches 

 long and i"75 inches across the body whorl. The shell is 

 also thinner, the whorls increase in size more rapidly and 

 regularly, and the spiral striae are somewhat less distinct, 

 canal a little wider and not so straight, occasionally it is 

 considerably twisted; outer lip much expanded, con- 

 sequently the mouth is unusually large and wide. 



Habitat : Off the Wexford and Waterford coasts in 

 20 — 30 fathoms, living in company with jF. Islandicus 

 and F. Jeffrey sianus on soft muddy ground. 



The large size of this variety gives, at first, the 

 impression of its being F. Islandicus but the peculiar 

 nucleus, the stronger spiral strise and the longer and 

 straighter canal of F. Islandicus enable it to be readily 

 distinguished from the shell under notice. I named this 

 variety some four years ago as a compliment to Mr. Robert 

 Bell, the well-known authority on the fossils of the ' Red 

 Crag.' Since then this old friend has passed away regretted 

 by all who knew his sterling worth. 



n. — F. gracilis var. Coulsoni, Jordan. — This variety differs 

 from the type in being more slender, the whorls more 

 flattened, the canal rather narrower, and the epidermis of 

 a pale fawn colour. 



This variety is as elongated as the var. convoluta but 

 the whorls are less tumid and the spiral striae not so strong 

 as in var. convoluta. 



Habitat : East and north of Unst in 60 — 90 fathoms. 

 It is named as a compliment to my friend, Mr. Frank 

 Coulson, in whose company, and yacht, the specimens were 

 dredged on our visit to the. Shetland Isles in 1886. Since 



J.C., vi., July, 1890. 



