76 Miscellaneous. 



was that it was shot between Bridlington and Bridlington Quay, 

 one Sunday morning, by a man who sold it to him for eighteen 

 pence. Mr. Hudson purchased it for half a sovereign. 

 Museum, York, June 24, 1868. 



Lithodomous Annelids. 

 To the Editors of the Annals and Magazine of Natural History. 



Gentlemen, — As I am anxious to put on record all the cases 

 which I can ascertain of the occurrence of Lithodomous Annelids or 

 worms, allow me to mention that I find that Dr. Ed. Grube, in his 

 " Beschreibungen neuer oder wenig bekannter Anneliden,," published 

 in the^ Archiv fiir Naturgesch.' vol. xxi. 1855, has described, under 

 the name of Heterocirrus saxicolu, an Annelid which perforates 

 limestone, and belongs to the same family (though differing in im- 

 portant generic features) as Leucodore, Johnston (Polydora, Bosc). 

 The Annelid was found at Villa Franca. 



I also find that that most accurate and talented investigator, M. 

 Lacaze-Duthiers, in his researches on the Gephyrean Bonellia, ob- 

 served that this animal inhabited cracks in rocks, and by preference 

 calcareous rocks ; further, he noted, in the case of calcareous rocks, 

 that the rock was to a certain extent excavated, thus fitting to the 

 body of the worm. It is almost impossible to assign any but a 

 chemical means of excavation to Bonellia. 



I am, Gentlemen, 



Truly yours, 



E. Ray Lankestek. 



Oxford, June 4th. 



On some Species of Oliva. 

 To the Editors of the Annals and Magazine of Natural History. 



Gentlemen, — I have but just now seen Mr. Marrat's reply to my 

 observations on this subject. In considering the value of the species 

 in question, I weighed the matter as far as it was possible to do it 

 without seeing the specimens. Whether my conclusions are wrong 

 or not, it is not for me to say. 



As regards the apparent inaccuracies in my paper pointed out by 

 Mr. Marrat, he will, I think, find, on referring to it again, that they 

 are explained by the context. 



With respect to my observation as to the fallibility of colour as a 

 guide for distinguishing species, I cannot help thinking that Mr. 

 Marrat's reply tends rather to prove its truth than otherwise. 



As far as I am concerned, the question as to the specific value of 

 Mr. Marrat's species will rest here. 



I am. Gentlemen, yours, &c. 



Thomas Geaham Ponton. 

 Clifton, Bristol, June 26, 1868. 



