Conrad of Salisbury's Descritio utriusque Britanniæ

A good many years since I had a communication from the Baron de Penhouet, a Breton Antiquary, respecting a work which I have never yet been able to discover. I may ascertain, through the medium of your very useful publication, whether there exists a work under the title of a "Descriptio utriusque Britanniæ," by Conrad of Salisbury, from a MS. of the time of Henry I. I should feel much obliged to any one who would favour me with this information.