706 STUDIES ON AUSTRALIAN MOLLUSCA, 



DiTROPis MACLEAYi, Brazier. 



Cycloinhorus (Ditrojns) heddomei, Brazier, Proc. Linn. Soc. 

 N.S.W., i., 1876, p. 113, non Blanford, 1869; C. (D.) macleayi, 

 Brazier, o;j. cit. ii., 1877, p. 122, nom. mut. 



^ (Plate xxxiv., figs. 15, 16, 17.) 



One of the types from Cape York (1-9 maj. diam., 1*4 minor 

 diam., 1-2 mm. height) is here shown. The operculum contained 

 in another specimen is not that of Ditropopsis. The description 

 is inaccurate regarding the number and position of the keels. 



Theora FRAGiLis, A. Adams. 



A. Adams, P.Z.S., 1855, p. 226. 



(Plate xxxiv., figs. 4, 5, 6.) 



The shell here figured came from Lane Cove near Sydney; it is 

 13-5 mm. long and 7 mm. high. Apparently it is the species 

 identified by Angas* as Theora nitida, Gould, f a Japanese species. 

 Gould himself doubted whether his species was not a small and 

 slender form of T. fragilis, the type of which is from More ton 

 Bay, Queensland. In a suite of Theora I gathered at Cardwell, 

 Queensland, small specimens exactly like the Sydney shells pass 

 gradually into a shell 18 mm. long, with a sinuate ventral margin. 

 I have not the material to decide whether the Japanese species is 

 identical with the Australian, but under the circumstances it 

 seems best to replace Gould's name by Adams' for the local species. 



We are informed by Smith | that Adams blundered grossly in 

 describing the dentition of this shell. 



MoDiOLARiA SPLENDIDA, Dunker. 



(Plate xxxiv., fig. 1.) 



Under the name of Vollsela splendida, this species was described 

 by Dunker^ as from California, probably an erroneous locality, 



* Angas, P.Z.S., 1867, p. 914. 



t Gould, Proc. Boston Soc. Nat. Hist., viii., p. 24, March, 1861. 



+ Smith, Chall. Rep., xiii., 1885, p. 90. 



§ Dunker, Proc. Zool. Soc, 1856, p. 365. 



