Oil a Moll u scan Genus. 199 



riblets ; posteriorly the edge is bordered witliiu by a heavy 

 callus, which gradually thins out about the middle of each 

 side ; the perforation is also surrounded by a callus. Length 24, 

 breath 12, height 5 mm. 



Another and larger specimen from Aldinga Bay is 27 mm. 

 long, and 13 broad. 



Of the spirit specimens from Port Philip represented by 

 figures 3 and 4 I observe that the coronal processes number 20, 

 the exposed portion of the tail nearly equals the shell in length, 

 is closely covered with simple and compound tubercles, and 

 deeply, transversely wrinkled ; epipodial groove indistinct, but 

 marked by a line of large conical papillae. From the original 

 of fig. 4, I extracted a radula, fig. 7, composed of a small 

 triangular rachidian, two sloping chisel-shaped laterals, a large 

 outer lateral, whose cusp is shaped like a scythe blade, and 

 armed with an inner tubercle, and two rows of pin sliaped uncini. 



Habitat. — Flinders (Gatlift^) and Port Philip (AVilson), Victoria. 

 Aldinga Bay, St. Vincent's Gulf, South Australia (Pritchard). 



Zy/^.— The original of Fig. 3, in tlie Biological Laboratory of 

 the Melbourne University. 



I have much pleasure in associating this interesting animal 

 with the name of my friend, Mr. G. B. Pritchard. 



ScYLL^A PELAGiCA, Linne. 



A specimen collected by Mr. J. B. Wilson, in Port Philip, and 

 forwarded from the Biological Laboratory of the Melbourne 

 University, by Mr. Pritchard, accords with the figures and 

 description of this species given by Dr. Collingwood in the Trans. 

 Linn. Soc, Zool., Second Series, ii., pp. 137-8, pi. x., fl'. 29-33. 

 Much uncertainty envelopes the species assigned to ScyHcea. 

 Bergh writes: "Several species have been described, or at least 

 nained, some of which will no doubt eventually prove to belong 

 to one circvnnjtquatorial species." Alder and Hancock say : "The 

 species of this genus have been so imperfectly described that it is 

 not easy to decide on their specific differences." To the former 

 authority we owe the latest list of the species, Zoologischen 

 Jahrbuchern, v., pp. 59-62. 



Though apparently unknown to Australian naturalists, and 

 omitted from all papers on Australian Mollusca, especially from 



