some new and peculiar Mollusca. 491 



Tliis is probably the unnamed bivalve No. 8 in Moller's 

 Index, p. 24. 



My description and figure were taken from dead specimens 

 which the late Mr. Hobert Dawson of Cruden dredged in the 

 Moray Firth ; but these may be semifossil or relics of the gla- 

 cial epoch, like Pecten islandicus^ Astarte dejjressa i^A. cribre- 

 cosfata^ Forbes, =-4. Rtchardsoni^ Reeve), Tellina calcaria^ 

 and several other arctic shells which have been dredged on 

 the coasts of Scotland. In St. -Magnus Bay, Shetland, I 

 dredged Leda ipemida^ L. abyssicola^ and L.frigida (= Yoldia 

 nana^ Sars) in a fresh state ; and I also dredged L. arctica 

 { = NucuIa tnmcata, Brown, =iV. 2JortIa7id{ca, Hitchcock, = 

 N. sih'qua and N. suldfera.j Reeve) among the Hebrides. It 

 is very difficult to say whether some of the above do not at 

 present inhabit our northern seas. 



Kellia symmetros^ ^ Jeflfr. 



Shell triangularly oval, equilateral, compressed but not 

 flat, transparent, and glossy : sculjyture^ none except micro- 

 scopic and slight lines of growth : colour glassy or clear 

 white : margins sloping equally from the beaks, rounded on 

 each side, gently curved in front : heaks circular or calyci- 

 form, prominent, incurved but straight : cartilage small, tri- 

 angular, placed between the hinge-line and lateral tooth on 

 the posterior side : hinge-line obtuse-angled : liinge-jjlate nar- 

 row but strong : teetli^ in the right valve two short laminar 

 laterals ; in the left valve a strong oblique and projecting car- 

 dinal and two laterals ; one of the laterals in each valve is 

 slight: m6•^'c?e pit-marked : sca?'^ indistinct. L. 0'04. B. 0'05. 



Station 9, 1750 fms. ; a single living specimen. 



The very young of K. suhorbicularis of the same size as this 

 is more globular j its beaks are not prominent j and the teeth 

 are different. 



Axinus cycladius, S. V. Wood. 



Kellia cydadia, Mon. Crag Moll. p. 122, tab. xi. f. 4 a, b. 



Poromya suhtrigona, Jeffr. Ann. & Mag. Nat. Hist. 3rd ser. Jan. 1868, 



p. 42, pi. ii. f. 1. 

 Kellia? cydadia, British Concliology, vol. i. p. 228; vol. v. p. 179, 



pi. xxxii. f. 3. 



Station 9, 1750 fms. ; one living specimen. Shetland, GO- 

 GO fms. (J. G. J.). 'Porcupine' Expedition, 1869, off the 

 north-western coast of Ireland, 1366 fms. ; 1870, Bay of 

 Biscay, 386 fms. Mediterranean, 30-120 fms. (Spratt, Acton, 

 Nares, Carpenter, and Monterosato) ! 



* Symmetrical. 



33* 



