RISSOA. 117 



tentacles transparent white, with opaque white spots ; the 

 foot has on the upper anterior part a bilobed fold, margined 

 with black below ; behind this the foot is opaque white 

 for a short way, the hinder part is semitransparent, with a 

 darkish streak in the centre, the sides are margined with 

 purplish -brown ; the lateral appendages are brown on the 

 anterior half, and whitish behind. 



Bissoa inconspiciia appears to range all round the shores 

 of Great Britain. It was first described under its received 

 name by Mr. Alder, who obtained it " from deepish water, 

 among corallines,*'"' on the Northumberland coast. In the 

 south it is found at Torquay (S. H.) ; Southampton, 

 Weymouth, Falmouth, Exmouth, Tenby and Manorbeer 

 (Jeffreys) ; Scarborough (Bean) ; Doggerbank (Howse) ; 

 Oban and elsewhere in the west of Scotland ; Lerwick 

 (Jeffreys). In Ireland it has been found at Portmarnock 

 (Thompson) ; Bantry Bay, Dublin Bay, and Birterbuy 

 Bay (Jeffreys). 



It ranges to Sweden. 



R. SEMISTRIATA, MoutagU. 



Conic, rather strong, not ribbed ; whorls rounded, jiartially 

 striated in a spiral direction ; body equal in length to the spire, 

 and quite as broad as it is long, encircled with two or three rows 

 of squarish spots ; pillar white, rather broadly reflected. 



Plate LXXX. fig. 4, 7. 



Turbo senustriaius, Mont. Test. Brit. Suppl. p. 136, pi. 21, f. 5. — Tukt. Conch. 



Diction, p. 201. — Dillw. Recent Shells, vol. ii. p. G42. 

 C'injula semistriata, Fleming, Brit. Animals, p. 309. — Brit. Marine Conch, p. 

 183, fig. 90 (badly). 

 ,, p«/c/ira, Johnston, Edinb. Philosoph. Journ. vol. xix. ; copied in Biit. 

 Marine Conch, p. 261. 

 l{issoatrlstnala,THOMV?,o^, Annals Nat. Hist. vol. v. p. .08, jjI. 2, f. JO. 



