360 PROCEEDINGS OF THE ACADEMY OF [1897. 



NEW AUSTRALIAN MOLLUSKS. 

 BY HENRY A. PILSBRY. 



The forms described below occurred in a recent sending received 

 from Dr. J. C. Cox, consisting mainly of marine mollusks he had 

 collected at Eden, on the coast of New South Wales, a catalogue of 

 which will probably be published by him elsewhere. In the pres- 

 ent scattered condition of the literature of Australian mollusks, 

 only omniscience can always escape the danger of overlooking some 

 description ; but reasonable care is believed to have been taken in 

 dealing with the following. 



Genus TATEA Tenison-Wpods. 



The relationships of Tatea seem to require examination. In the 

 Manuals of Fischer and Tryon it is placed under Jeffreysia as a 

 subgenus ; but it differs radically from this group in dentition and 

 operculum, and is also unlike it in shell characters. The Rissoina 

 group is that to which Tatea seems allied by its operculum ; and 

 Eatoniella Dall, with species in Kerguelen Island, South Georgia 

 and New Zealand, would apparently be the most nearly allied 

 genus, if judged by conchologic features only. 



Eatoniella 1 has an ovate, one- or few-whorled operculum with the 

 nucleus near the columellar margin, a process arising therefrom 

 directed toward that margin. The shell has 4J-6 convex whorls, 

 is thin, the peristome somewhat reflexed at the columellar margin, 

 and neither contracted nor indistinctly varixed as it is in Tatea. 

 The species are all quite small, the largest known being but 3 mm. 

 long. The dentition as described and figured by Schako in the 

 paper of Martens and Pfeffer cited above, has some peculiar feat- 

 ures. The rachidian tooth is practically as in Rissoa, apparently 

 with a basal denticle on each side situated low as in Rissoa, although 

 Schako does not make this clear. The lateral is as usual in the 

 group. The inner uncinus has as few or feiver denticles than the lat- 

 eral, and they are quite large. According to Schako's figures and 



x See E. A. Smith, Philos. Trans., Vol. 168, p. 174, and Martens and 

 Pfeffer, Jahrb. Ilarab. Wiss. Anstalten, 111, p. 9-4, 1886. 



