Mr. A. Adams on a new Species of Damaster from Japan. 59 



downwards, is made to adhere to it. The grinding-dowu of the 

 remaining surface is now accomplished, the superincumbent film 

 of mica yielding to the hone or grinding disk with the greatest 

 readiness. After washing, as before, a thin glass cover is applied, 

 and the operation is complete. 



In order to ensure the non-displacement of the ground sur- 

 faces, and also the perfect parallelism of the minute ground 

 objects to the surface upon which they rest (a matter of the 

 highest importance wherever clear definition is demanded), 

 great care is necessary in heating the balsam only to such a 

 degree as to produce suflBcient hardness, and permanently to 

 secure the objects. 



With due caution, the finest organic or inorganic particles of 

 matter may in this manner be ground into sections, and their 

 surfaces reduced so as entirely to obviate the diffraction of the 

 rays of light attendant on the interposition of surfaces which 

 are not parallel to one another. 



I remain. Gentlemen, 



Your most obedient Servant, 



G. C. Wallich. 



VII. — Notice of a new Species of Damaster from Japan. 

 By Arthur Adams, F.L.S. &c. 



Damaster Fortunei, A. Adams. 



D. capite et thorace violascentibus nitidis, transversim niguloso-puuc- 

 tatis ; thoracis lateribus dilatatis ; elytris triliratis, liris tubercu- 

 losis, interstitiis verrucis depressiusculis et punctis elevatis scabri- 

 usculis, apice angustato sed vix producto et non aculeate. 



Hab. Awa-Sima, Japan. 



In this species, which is of the same size as D. hlaptoides, but 

 of stouter build, the head and thorax are of a fine violet tint, 

 the head is wider between the eyes than in the known species, 

 the sides of the thorax are dilated, the body is considerably 

 wider and more ovate, and the elytra, instead of being simply 

 sulcate, are furnished with three slightly prominent tubercular 

 ridges, with wart-like tubercles and elevated points filling up 

 the interstices. 



I have much pleasure in naming it after Mr. Fortune, who 

 has just returned from Japan, and in conjunction with whom I 

 compared it, at Shanghai, with a careful figure of D. blaptoides 

 supplied to him by Mr. Adam White. 



