Scientific Notices. 267 



specimen of Procellaria Leachii, in the Manchester Museum, did not 

 appear to be known there as such : as he is informed by Mr. Barrow, 

 that " the individual was found dead in a ploughed field, about four years 

 " ago, near Wilmslow, thirteen miles from Manchester, the morning 

 *' after a severe gale of wind from N.W., and being brought to the Mu- 

 " seum, was recognized as Leach's Petrel^ from Temminck's description." 

 This account confirms Mr. Fox's conjecture of the specimen having been 

 killed in Great Britain. 



^ Ligament of Productus. 



M. Honinghaus has recently circulated among his friends figures of 

 casts of several species of this curious genus of fossil shells, for the 

 purpose of exhibiting clearly the internal structure of the valves. The 

 species figured are the Producti punctatus? and antiquatus, Sowerby, 

 and the Anomites thecarius, Schloth. In the former the ligament of the 

 convex valve is composed of two triangular portions, each of which is 

 applied on its longer side to the margin of a line passing at a right angle 

 with the hinge about two-thirds across the shell, and is completely, though 

 somewhat irregularly, pinnate : that of the concave valve is formed by 

 two oblong irregularly pinnate portions, which diverge as they approach 

 the hinge. The ligament of the convex valve of the Prod, antiquatus 

 resembles that of the Prod, punctatus, but the triangular portions are 

 nearly equilateral and the pinnce are much less deeply cut; the oblong 

 portions of that of the concave side being parallel, and merely dentate 

 on their edges. It should be added that in another figure, given by M. 

 Honinghaus as that of a cast of the convex valve of Prod, antiquatus^ 

 the two portions of the ligament appear to be united so as to form but 

 a single one, nearly straight towards the hinge, with which it lies almost 

 parallel, and assuming in its remainder a somewhat serai-circular 

 form, lying obliquely, dentated on its edge, and marked by a few- 

 deep sulci. Can this shell really be of the same species as the pre- 

 ceding? The spreading out of the valve is much more considerable, 

 and in an opposite direction to that of the other figure. In the convex 



