BY c. hedlp:y. 429 



ROCHEFORTIA VIASTELLATA n.Sp. 



(Plate xxxvi., figs. 11-12.) 



Shell thin, long and narrow, a little inequilateral, dorsal and 

 ventral margins straight and parallel, ends rounded. Colour 

 white. Sculpture : regular concentric threads cut into grains by 

 curved obliquely diverging stride. In the middle of the disk the 

 diverging lines become obsolete. In general appearance the 

 three intersecting curves resemble the pattern called " engine- 

 turned." Length 4*05; height 1-9; depth of single valve 0-G mm. 



The subcylindrical form and intricate sculpture well distinguish 

 this form. There is but a single valve, from 5-10 fathoms. 



Galeomma denticulata Deshayes. 

 Galeomma denticulata Deshayes, Moll.de Reunion, 1863, p. 19, 

 PI. XXX., f.1-3. 



A single valve, smaller and proportionately higher than the 

 figure, is assigned to this species, which has not before appeared 

 in Australia. 



Cardium lobulatum Deshayes. 



Cardium lohulatum, Deshayes, Proc. Zool. Soc. 1854(1855), 

 p.332; id., Smith, Fauna Maldive, Lace. Arch. ii. 1906, p.625. 



(Plate xxxvii., figs.19-21.) 



Mr. C. J. Gabriel identified this, by comparison with the type 

 in the British Museum. A number of separate valves occurred 

 to us in the Cairns lagoon. That now figured is 32 mm. high, 

 26 mm. long, and 18 mm. deep. Externally cream mottled with 

 brown, internally flesh-pink. 



As neither figures nor measurements were given to assist in 

 the identification, the species has remained practically unknown. 

 Tryon"^' and Hidalgof have complained of the insuthciency of 

 published data. The worst work, probably the only bad work, 

 Deshayes ever did was that published in London. The deliber- 

 ate omission of measurements was probably due to the unhappy 

 influence of A. Adams. 



* Amer. Jouin. Couch, vii. 1872, p. 273. 

 + Mem. R. Acad. Cien. Madrid, xxi. 1903, p.342. 



