424 ON THE OCCURRENCE OF PLECOTREMA, ETC., IN PORT JACKSOI^. 



bifid tooth and the anterior angle of the aperture, of a compressed 

 deeply entering keel, bifid externally, situated half-way down the 

 aperture, and lastly, of a compressed deeply entering keel upon 

 the columella, whose course can be traced from without by a wide 

 furrow descending to the extremity of the umbilicus. Length 

 5J, breadth 3J mm. 



SCUTELLINA CINNAMOMEA, Gould. 



This species was described by Gould in the Proc. Best. Soc. 

 Nat. Hist. Vol. ii. p. 151, in 1846, as a Patella (Exped. Shells, 

 p. 9) ; it was again described by the same author in the U.S. 

 Exploring Expedition, p. 345, and figured in the same work, fig. 

 449a, b. 



Although the species has long been known to those who 

 take an interest in Conchology in New South Wales and South 

 Australia, it has always been considered a rare shell ; but this year 

 I have found it in considerable numbers rather below low-water 

 mark, adhering to stones lifted from pools of undisturbed water 

 all along the north side of the harbour, from Bradley's Head to 

 Ball's Head, in the month of September. 



In 1867 Mr. G. F. Angas published in the Proc. Zool. Soc. 

 p. 185, a very valuable List of the Marine Mollusca found in Port 

 Jackson and the adjacent Coasts ; in fact, the issue of this paper 

 was the starting point of Conchological study in New South 

 Wales : for the time a masterly production. He listed in it 

 three species of Emarginula : rugosa of Q. et G., stellata of A. 

 Adams, and dilecta of A. Adams. No. 210 on Angas's list, E. 

 (Glypidina) stellata, was the species which workers in conchology 

 here were led to believe, till 1871, was the species under considera- 

 tion and many specimens were distributed as such. But in 1871 

 Angas published a List of Additional Species of Marine Mollusca 

 found in Port Jackson and the adjacent Coasts, in which Scutellina 

 cinnamomea was included (p. 97), and it gave A. Adams' Scutellina 

 ferruginea as a synonym. 



This species is also recorded in Whitelegge's List of the Marine 

 and Fresh-Water Invertebrate Fauna of Port Jackson and Neigh- 



