269 



One valve dredged off Troubridge by Mr. E. H. Matthews ; 

 several living specimens and detached valves dredged at 14 to 

 17 fathoms in Yankalilla Bay by Dr. Verco. The largest 

 example measures 30 mm. long by 12 mm. broad. 



The habitat of the species was unknown to Lamarck, but he 

 gives Atlantic Ocean with a doubt, Deshayes in 1836 simply 

 repeats him. Reeve refers the species to the West Indies. 



This beautiful mussel is, however, recorded by Tenison- Woods, 

 Proc. Roy. Soc, Tasmania, as very rare in Long Bay, Tasmania, 

 and of about 45 mm. long. The South Australian examples are 

 much smaller, but otherwise are comparable with Reeve's figure. 

 Mr. John Brazier writes me, " I dredged Modiola arbor escens 

 outside Sydney Heads, some 17 years ago, in 45 fathoms, also 

 inside Port Jackson in 18 fathoms." 



Terebratula Wyvillei, Davidson. 



Be/. — Challenger Brach., t. 2, fig. 7-8 ; id. Trans. Lin. Soc, 

 1886, t. 2, f. 8-14. 



Ofi" South Australia, lat. 42° 42', long. 134° 10', depth 2,600 

 fathoms. 



Also Chili, Patagonia, and Falkland Islands. 



EXPLANATION TO PLATE XL 



Fi<?. 

 1-la, Crassatella carnea. Slightly enlarged. 



2. Lucinopis pellucida. 2 x. 



3. Latirofusus nigrofuscus. 2 x. 



4. Leda Verconis. 3 x. 



5. Leiopyrga octona. 3 x, 



6. Siphonalia oligostira. Nat. size. 



7-7a. Semele monilis. Nat. size, and magnified portion. 



8. Pectunculus sordidus. 2 x. 



9. Diala magna. 3 x. 



10. Tellina Vincentiana. 2 x. 



