Mr. W. L. Distant on new Cicadidfe. 323 



sideration. There are those in which the typical styliform 

 columella is present ; others in which the septa stop short and 

 expose a broad tabulate area in the centre ; in others the septa 

 extend inwards along the superior face of the tabulae, a portion 

 of the septa coalesce and assume a more or less fasciculate 

 aspect, and the central septum of ^ach fascicle extends to the 

 centre and unites with similarly arranged septa from the 

 opposite side of the corallum to form a pseudo-columella, 

 similar to the septal arrangement of Lithostrotion junceum^ 

 Ure. If the section exposed is on the plane of the tabulge, 

 the columella is not observable, demonstrating that the septa 

 and columella are developed between the tabulee in this 

 variety. In some of the corallites on the same slab the 

 columella is tubular, somewhat similar to the tubular colu- 

 mella which characterizes some of the species of the genus 

 Cyathaxonia. Thus we have three distinct characteristics 

 exemplified in the structural details of the central area in 

 this group of corallites, each of which, if sectioned singly, 

 would demonstrate structural characters which have been 

 regarded as having specific distinction. In the type of the 

 genus the compound corallum, the styliform columella, the 

 tabulse forming the floor in the central area, and the sparse 

 vesicular tissue in the outer area are the distinguishing cha- 

 racteristics by which the genus can at all times be recog- 

 nized. 



In some of the corallites development is by fission, whilst 

 in others it is by calicular gemmation, demonstrating that it 

 is not only difficult to define specific distinction, but that we 

 are not in a position to dogmatize as to specific identity, 

 unless all the varieties can be examined and compared. 



XL. — Descriptions of new Species of Oriental Cicadidse. 

 By W. L. Distant. 



All the species here described will be figured in my mono- 

 graph of Oriental Cicadidaj. 



Tosena depicia^ n. sp. 



Head and thorax above black; head with a spot at apex 

 of front and a spot at each anterior angle of vertex, two cen- 

 tral spots on anterior margin of pronotum, the posterior margin 



