NORTHUMBERLAND AND DURHAM. 2G5 



therefore I feel no liesitation in adopting it, altlioiigli it is placed 

 among the synonyms in the " Perm. Monograph." It occurs 

 rather sj)aringly in the upper beds of limestone, and more rarely 

 in the shell, and compact-limestone. 



The Nucula Tateiana, King, is mentioned here that it may not 

 be lost sight of. It is impossible to adopt it as an authenticated 

 species, for, according to Mr. King's own words, the description 

 is drawn up from " the dorsal half" of a specimen only. Baron 

 Schauroth has favoured me with some specimens of a true Per- 

 mian Nucula (N. Beifriclui) from the zechstein of Germany ; and 

 this renders it very likely that on some future occasion specimens 

 of a true Nucula may occur in our limestone. 



20. SOLEMYA, Lamarclt. 

 1. S. NOEMALis, Howse. PI. XL fig. 7.* 



" Slieli transversely oval, narrow, sli</htl// arcuated ; heaJtS in- 

 distinct near the posterior end ; anterior (much) elongated; mus- 

 cular impressions large, slight; a few raised lines diverging from the 

 beaks to the free margins on the cast; external surface smooth. '" 



I obtained a single left-valve of this very rare shell on a block 

 of Humbleton Hill shell-limestone, on Good Friday, 1815. 

 I afterwards described it, in the above words, in the " Tyneside 

 Catalogue." It was there pointed out, that though it bears a 

 slight resemblance to S. hiarmica, yet the beak is nearer the 

 posterior end, and the shell is much narrower than in the Eussian 

 species. The anterior is also more elongated, and the surface is 

 quite smooth. It is also very much smaller. All these differ- 

 ences are borne out by two other left -valves lately found by ]\Ir. 

 Kirkby at Tunstall. 



Mr. King had the loan of the above specimen for several 

 months ; and I find he has not only recorded his discovery of the 

 specimen in my cabinet ! ! (^London Geol. Journ., vol. i., p. 10,) but 

 has also, in the " Perm. Monog.," attempted to describe and to 

 figure a species which he identifies with this. But he has succeeded 

 very badly, both in the description and in the figure, which does 



* TJic ligure in the accompany iiig plate does not represent (he lonndcd appearance ol 

 the anterior extremity as correctly as could be desired. 



