1292 nipr.onoN 



The name rugatns was applied previously to a European 

 IJjiio by Rossmassler ; hence T liave chan.^ed Hutton's name 

 to rugnlosiis. This seems to be a small form of menmeci, 

 which sometimes merges into hochstcttcvi. 



\'ar. Jiochsictteri (Dunker). 



v^maller generally than the type, shorter, more blunt behind, 

 but higher than rugnlosiis. 



Length 51, height 33, diam. 10 mm. 



Length 49, height 34, diam. 11 mm. 

 Unio Iwchstetten Dunker, Mai. Bl, \'in, 1862, p. 153. — Sow- 



ERBY, Conch. Icon., X\T, 1868, pi. lxxxvi, fig. 463. 

 Diplodon menziezi var. hocksteUeri Simpson, Syn., 1900, p. 



889. 



Nearly all the specimens I have seen of this and rugnlosiis 

 are diseased and more or less distorted. 



Suter believes this to be only a pathologic form of menzicai. 

 lie says in a letter to the author that he has seen the same kind 

 of disease among small ntgiilosiis. 



\'ar. depanpcratiis (Ilutton). 



Shell very thin, oblong, compressed ; anterior end very short, 

 rounded ; posterior end slightly winged, very obliquely trun- 

 cated ; dorsal margin gently ascending, slightly arched ; ventral 

 margin sinuated in the middle ; pseudocardinals minute, com- 

 pressed, smooth, only one in the left valve; laterals low and 

 thin. 



Length 60, height 30. diam. 15 mm. 



I^ake Lakapuna Auckland ; New Zealand. 

 Unio dcpaitperatns Hutton, Tr. N. Z. Inst., XVI, 1884, p. 



216. 

 Diplodon menziezi var. dcpaitperatns Simpson, Syn., i()00, p. 



890. 



This may be a valid species, but as it has never been figured, 

 so far as I am aware, and, as there do not seem to be any 

 decided distinguishing characters to it, I place it here. I have 

 never seen anything I could satisfactorily refer to it. Its 

 slighth' sinused base seems to be its best character. 



