Messrs. M^Andrew & Forbes on new or rare British Animals. 97 



dent of the characters of the shell, the animals are very distinct ; 

 those of Lyonsii being highly coloured, like the normal form of 

 T. ziziphinus, whilst T. formosus is perfectly white. 



We dredged it adhering to large stones in fifty fathoms on 

 the Ling Bank, forty miles to the westward of the mainland of 

 Zetland, and afterwards nearly half-way between Fair Island and 

 Fitful Head*. v 



2. Margarita undulata, var. trochiformis. 



With some doubt we refer to the above species of Sowerby and 

 variety of MoUer (Index Molluscorum Grcenlandise) a Margarita, 

 of which we dredged a single specimen near Lerwick. Whilst it 

 exactly agrees with Moller's description, the specimen does not 

 so well accord with any of the examples of Margarita undulata 

 in British collections. It is small and probably not full-grown 

 (2 J breadth, /j height), and in colour and habit presents a stri- 

 king resemblance to Trochus tumidus, but is easily distinguished 

 by its rounded whorls and circular aperture. 



3. Cerithium nitidum, sp. nov. C. testa subulata, alba, anfractibus 

 12, planis, spiraliter longitudinaliterque costatis ; costis spiralibus 

 tribus, fortibus, granuloso-decussatis ; basi Isevi, margine incras- 

 sato Isevi ; apertura quadrangular!, cauda brevi, lata, contorta. — 

 Length -j^ths of an inch ; maximum breadth j^^th of an inch. 

 PI. IX. fig. 2. 



A very beautiful, slender but rather strong shell, having twelve 

 whorls, which are nearly flat, and ornamented by three strong 

 spiral ridges, decussated and granulated by numerous longitu- 

 dinal ribs. On the last whorl there is an additional smooth 

 ridge, forming the margin. The base is smooth. The mouth is 

 quadrangular, with a short and rather wide but equal canal, 

 twisted suddenly to the left. 



Three specimens were dredged in the same localities with the 

 Trochus formosus. 



4. Pleuroloma hrachystomum, Philippi, Enum. Moll. Sci. vol. ii. 

 p. 169. t. 26. f. 10. 



Of this pretty little Pleurotoma we dredged a specimen be- 

 tween Fair Island and Fitful Head in fifty fathoms. It has been 

 taken by Mr. Jeffreys in the Hebrides. 



5. Fusus albus, Jeffreys, MSS. F. testa minuta, lanceolata, pellu- 

 cida, alba, anfractibus 5, convexis, ultimo maximo, omnibus spi- 



* I have recently seen a specimen in the collection of Lieut. Thomas, 

 R.N., who dredged it in a similar locality near Orkney. In that gentle- 

 man's collection is also the rare Buccinum Uneatum, dredged quite fresh in 

 thirty-five fathoms off the Staples ; thus fixing with certainty the indige- 

 nousness of one of our most doubtful species. — E. F. 



