542 STUDIES ON AUSTRALIAN MOLLUSCA, IX., 



ture : dense, fine, regular concentric threads. On the inner 

 ventral margin are a dozen small tubercles answering to the 

 opaque rays. Length 2-1, height 1*5, depth of single valve 

 0-25 mm. 



ffah. — Manly Beach, near Sydney, type (Miss L. Parkes); 

 Wreck Bay, N.S.W, (self); Port Fairy, Victoria (the late Rev. 

 T. Whan). 



Type. — Miss Parkes has generously promised to present the 

 type to the Australian Museum. 



MONTACUTA SEMIRADIATA Tate. 



(Plate xxxi., figs.l, 2.) 

 Tate, Trans. Roy. Soc. S. Aust. 1888, p.63. pi. xL, f.2. 

 This species is externally so like what I have just described 

 as Cyamiomactra conwiunis that Prof. Tate distributed C. com- 

 munis to his friends under the label of M. semiradiata. To 

 better elucidate the difference, I have by the kindness of Dr. J. C. 

 Verco been enabled to figure one of the type-lot of M. semiradiata. 

 M. semiradiata does not appear to me to be happily placed, 

 but I am not now prepared to decide on a better generic location. 

 Perhaps it is related to Poromya. 



Neolepton rostellatum Tate. 

 (Plate xxxi , figs. 3, 4.) 



Kellia rostellata Tate, Trans. Roy. Soc. S. Aust. xi. 1888 (1889), 

 p.63, pi. xi., f.l4. 



Dr. Verco has kindly lent me the type specimens of this species. 

 From the hinge, now for the first time figured, it seems that the 

 species was not properly classed in Kellia, and I propose to 

 transfer it to Neolepton. The latter genus has not hitherto 

 embraced an Australian example, but two species from New 

 Zealand were assigned to it by Bernard. 



The type series of Prof. Tate exhibits considerable variation in 

 colour and contour. A more oblong shell than that originally 

 fisfured is selected for illustration. 



