APPENDIX. 257 



(badly).— Gmel. Syst. Nat. p. 3359.— Dill w. Recent Shells, 

 vol. i. p. 320.— Wood, Index Test. pi. 12, f. 41 (copied from 

 Chemn.) 

 Modiola arctica, Leach, Appx. Ross Voyage, probably. 

 „ faba, Hanl. Recent Shells, p. 242. 



Shell of an oblique rounded ovate figure, moderately ventricose, 

 with a glossy reddish olive-coloured epidermis, marked throughout 

 with numerous radiating depressed costellfe, that are separated by 

 rather narrower shallow sulci, and are indistinctly crossed towards 

 the ventral margin and broader extremity by concentric wrinkles. 

 Both ends rounded ; the posterior one broadly and rather bluntly 

 so : the anterior side extremely short, and much narrowed by the 

 upward slope of the arcuated ventral margin. Nacre darkly iri- 

 descent. Hinge line a little curved ; the cardinal plate, as well 

 as the hinge nodules (of which there are six in the specimen 

 described from), widening quickly anteriorwards. Inner edge 

 strongly crenated. Size, two lines long, nearly three broad. 



Vol. ii. p. 241. Arca raridentata. 

 Taken by Mr. Barlee, thirty miles east of Zetland. 



ACEPHALA PALLIOBRANCHIATA. 



Vol. ii. p. 357. Terebratula cranium. 



Four examples of this very rare shell have been procured by 

 Mr. Barlee, thirty miles to the east of Zetland. 



Vol. ii. p. 361. Megathtris cistelltjla. 



Taken by Mr. Barlee, forty miles to the east of Zetland ; also 

 in the coralline zone at Exmouth. The generic name, Argiope, 

 given by Des Lonchamps, has precedence of Megathyris, as shown 

 by Mr. Davidson, whose excellent papers on recent and fossil 

 Brachiopods are especially deserving of study by British malaco- 

 logists. 



VOL. IV. L L 



