BY C. HEDLEY. 699 



present drawing is of a specimen 23 mm. long, collected by Mr. 

 W. L. May, at Fredrick Henry Bay, Tasmania, and submitted 

 to the Geneva Museum. 



In places on the Tasmanian coast, M. jynlex encrusts the rocks 

 so thickly that the stones appear as if painted black. Though 

 not yet recorded, it will probably be found to reach the southern 

 coast of New South Wales. On farther consideration, I would 

 unite M. ater* as well as M. crassus to the synonymy of M. pulex. 



CoDAKiA PisiDiUM Dunker. 

 (Plate Ixxix., figs.25, 26, 27, 28.) 

 Lucina pisidium Dunker, Malak. Blatt., vi., 1860, p. 227; Id., 

 Moll. Jap., 1861, p.28, PI. 3, f.9. 



This species was recorded from Sydney by Angasf as Lucina 

 parvuhi Gould. Though not uncommon, the species is not well 

 known, for the only figure published is poor, and not easily 

 accessible. Figures of a Sydney specimen, 5 mm. long and the 

 same high, are, therefore, here presented. 



JOANNISIELLA SUBQUADRATA, Sp.nOV. 



(Plate Ixxx., figs.33, 34, 35, 36.) 

 Shell subquadrate, rather thin, much inflated, slightly excavate 

 on the posterior side, which is bounded by an obscure angle, 

 posterior margin truncate, anterior rounded, ventral straight, 

 dorsal curved. Colour olive-buff. Sculpture fine, close, con- 

 centric threads. Umbo prominent, incurved. Two cardinal 

 teeth in each valve. Length, 25; height, 23; depth of single 

 valve, 9 mm. 



Hah. — A few separate valves from the beach at Karuraba, 

 Gulf of Carpentaria (self, 1903). This is a deeper, squarer shell 

 than J. ohlonga Hanley, and is somewhat of the same proportions 

 as J. sphcericula Desh., than which it is larger and more solid. 



Cyamiomactra balaustina Gould. 

 (Plate Ixxvii., figs. 2, 3.) 

 In the preceding volume (p.268), it was noted that my C. 

 tiitida was synonymous with Gould's species. Figures of the 



* Dunker & Zelebor, Verhandl. Zool. Bot. Gesell. Wien, xvi., 1866, p. 914. 

 t Angaa, Proc. Zool. Soc, 1867, p. 926. 



