MARSHATJ. : ADDITIONS TO "BRITISH CONCHOLOGY." 2O5 



N. rostrata Spengl — Off the Shetlands iiif , a perfect specimen 

 and two valves (Simpson) I The animal has been shortly described 

 by Gwyn Jeffreys.^ 



JV. obesa Lov. and N. striata Jeff, have been dredged off the 

 Butt of Lewis in 53of by the ' Knight Errant.' 



Three specimens of N. lamellosa M. Sars have been dredged by 

 the Scottish Fishery Board off the Butt of Lewis in S45f., " with the 

 ribbing nearly obliterated ;" several others midway between the 

 Shetlands and Norway in igyf., various other examples between the 

 Orkneys and Faroes in ig4f. and off the Faroes in 7 if. (Simpson)! 

 while Mr. Tomlin's collection contains two examples of this pretty 

 species from the reputed depth of 160 fathoms off East Shetlands. 



Mr. Edgar Smith described in the Annals for 1889 a new species 

 of Necera as N. {^Cuspidaria^ greenly a specimen of which was dredged 

 by the Rev. ^V. S. Green in the Atlantic off Ireland in 1,000 fathoms, 

 and he identified another valve which was dredged by the ' Triton ' 

 Expedition in the Shetland-Faroe Channel in 57of 



Corbula gibba Olivi. — It has been observed that certain 

 specimens of C. gibba in the young stage " have spines on the right 

 valve at the anterior side of the beak,"'-^ these spines varying from 

 three to five in number. 



Mya truncata L. — St. Aubin's Bay, Jersey, a valve, and there is 

 another in the Jersey Museum. Mr. Marquand's record for Alderney 

 is not this, but a large valve of Thracia papyracea var. villoshiscula. 



var. abbreviata Jeff. — Great Fisher Bank, off Aberdeenshire 

 (Simpson) ! Gwyn Jeffreys alludes to this form as " the variety 

 ziddevallensis or abbreviata,^'''^ though in his work he cites var. 

 nddevallensis as a separate variety.'* They are scarcely the same 

 thing, however. Var. abbreviata Jeff differs from the type only in 

 the posterior end being abruptly shortened ; in the var. iiddevallensis 

 Forb. it is still shorter, and cut obliquely inwards just clear of the 

 beaks, giving it the curious appearance of only half a valve ; it is also 

 smaller, more depressed, and very much more solid. 



Panopea plicata Mont. — Garelochhead i6-25f , large and 

 perfect but dead; and Lamlash 22f (Knight) ! 



Saxicava norvegica Spengl. — From trawl-boats arriving at 

 Grimsby, Scarborough, Aberdeen, etc., rarely containing the animal. 

 East Shetlands loof., a dead but fresh and perfect specimen. I have 

 also a specimen trawled 40 miles N.E. of Kinnaird's Head which is 



1 Moll. ' Lightning' .-ind ' Porcupine,' Proc. Zool. Soc, 1881, p. 939. 



2 Massy : " Note on an early spinous stage of Corbula gibba Olivi," Journ. 0/ Conch., 191 1, 

 vol. 13, p. 191. 



3 Arctic Fossils, Ann. Mag. N. Hist., 1S77, p. 235. 



4 Brit. Conch., vol. iii. , p. 70. 



