Reviews — Dr. von Lasaith — ^tna. 37 



Ctenodus (as ■well as of Dlpteriis) by the narrowness of the palatal dental plate and 

 the small number and slight divergence of the radiating denticulated ridges. 



Another species of Ctenodus represented in my collection by a broken palatal tooth- 

 plate of considerably larger size occurs also at Borough Lee. So far as the specimen 

 goes, it shows some resemblance to C. obliquus, Hancock and Atthey, but it is too im- 

 perfect for accui-ate identification. Eibs, apparently of Ctenodus, are also not 

 uncommon. 



Ganoidei. — Coelacanthus striatus, n.sp. 



Scales about \ inch in diameter, rounded, thin, interiorly smooth, and showing 

 externally a posterior free sculptured area, of about \ the extent of the whole siu'face. 

 The ornament of this area consists of fine closely set rounded ridges sometimes bifiu:- 

 cating and intercalated, sub -parallel and slightly wavy, proceeding longitudinally 

 to the posterior margin without convergence, indeed on the other hand sometimes 

 diverging in their progress. 



No remains of this species have occurred but the scales, which are, however, very 

 distinct in their markings, the striae of the free surface showing no tendency either 

 to concentric arrangement or to convergence towards and round the middle line. 



Ganopristodiis splendens, n.g. and sp. 



Fragments of flat dentigerous bones, varying in size from a few lines up to 1| inch 

 in length and J inch in depth. On one margin is a row of peculiar teeth, low, 

 laterally flattened, anteriorly and posteriorly trenchant, confluent at the base with 

 each other, and with the substance of the bone which carries them, and covered with 

 a brilliant layer of ganoine, which extends along their bases, and is then thrown into 

 delicate wavy folds — longitudinal in direction or sometimes forming little waves round 

 the base of each tooth. Each tooth, moreover, besides its median bluntly conical 

 point, has its anterior and posterior trenchant edges in most cases each serrated with a 

 couple of secondary deuticulations. In some instances the portion of bone which 

 seems to have looked towards the cavity of the mouth, shows some small rounded 

 tubercles or granulations. 



These singular jaw-fragments form a complete puzzle, and though we may safely 

 believe them to be piscine in their nature, I must confess that I have not the slightest 

 idea of the fish to which they belonged. Uufortimately the number of specimens, 

 which I have obtained, is as yet so few, that I have not been able to subject any of 

 them to microscopic examination, but their external characters are so striking as to 

 justify their receiving a name, and being placed provisionally among the Ganoidei. 



I^:E"vz:E]•vv^s. 



-Der ^tna. Nach den Manusobipten des verstorbenen Dr. 

 W. Sartorius von Waltershauskn, v. Dr. Arnold von Lasaulx. 

 F- Band. Leipzig, 1880. 



iR. A. VON LASAULX has undertaken tlae laborious, but grate- 

 ful, task of publishing the observations left in manuscript 

 of the Baron von Waltershausen, who died in 187G, and left beliind a 

 large mass of inaterials regarding the past history and present 

 structure of ^tna, collected during no less than ten different visits 

 made to Sicily between the years 1884 — 69. This labour of love 

 could not have fallen into better hands ; and in the volume before us, 

 which is to be followed by another, we have an example of the 

 highest act of friendshijj which a surviving friend and fellow-worker 

 can perform for one who has passed away ere his own work has 

 been completed. 



In the volume before us, we have an account of Sartorius von 

 "NValtersliausen's journeys to Sicily, the observations he was enabled 

 to make on the volcanic region during many daj's devoted to his 

 task, and these observations are accompanied by an exquisitely 

 executed map on a scale of 2-oirocrotli' reduced from the larger chart 



