474 Transactions. 



investigation I find that Dall had overlooked the introduction by Perry in 

 his "ConchoJogy" (1811) of the genus Haustrum. This genus included 

 several species, of which one was Haustrum zealandicum Perry. By tau- 

 tonymy this becomes the type species of the genus, as it is the species 

 named Buccinum haustrum by Martyn in 1784. This name will therefore 

 displace Lepsia Hutton, 1883. The acceptance of generic, names to indi- 

 cate the groups seems the most satisfactory method to advocate, as the 

 shells have been so variously grouped. A study of the wanderings of 

 B. haustrum Martyn should convince any one of the propriety of this step. 

 In the family Thaididae I would therefore read, — 



Genus Haustrum Perry, 1811. Haustrum Perry, " Conch ology-." pi. xliv, 

 1811. Type: Buccinum haustrum Martyn. Synonym: Lepsia 

 Hutton, Trans. N.Z. Inst., vol. xvi, p. 222, 1883 : same type. 

 Haustrum haustrum (Martyn, 1784). Synonyms: B. haustorium Gmelin, 

 1791 : Haustrum zealandicum Perry, 1811. 



Genus Neothais Iredale, 1912 (em.). Neothias (error type) Iredale, Proc. 



Mai. Soc. (Lond.), vol. x, p. 223, 1912. Type : Purpura smithi 



Brazier. 

 Neothais succincta (Martyn, 1784). Synonyms : B. orbita Gmelin, 1791 ; 



P. textiliosa Lamarck, 1816. 

 Neothais smithi (Brazier, 1889). Svnonvan: P. striata bollonsi Suter, 



1906. 

 Neothais lacunosa (Bruguiere, 1789). Synonyms: B. striatum Martyn, 



1784, not Pennant, 1777: P. rugosa Lamarck, 1820: P. rupestris 



Valenciennes, 1833. 



Genus Agnewia Tenison- Woods. 1878. Agnewia Tenison- Woods, Proc. 

 Roy. Soc. Tasm., 1877. p. 29 (1878). Type: Purpura tritoniformis 

 Blainville. Synonym : Adamsia Dunker, Proc. Zool. Soc. (Lond.), 

 1856, p. 357 : same type : not Adamsia Forbes, 1840. 

 Agnewia tritoniformis (Blainville. 1833). Svnonvm : Adamsia typica 

 Dunker, 1856. 



Genus Lepsiella Iredale, 1912. Lepsiella Iredale, P/oc. Mai. Soc. (Lond.), 

 vol. x, p. 223, 1912. Type : Purpura scobina Quoy and Gaimard. 

 Lepsiella scobina (Quoy and Gaimard, 1833). 



- var. albomarginata (Deshayes, 1839). Synonyms : tristis 

 (Dunker, 1866); biconica (Hutton, 1878) 

 ■ var. rutila (Suter, 1899). 



Neothais succincta (Martyn, 1784). [P. 423.] 



This species does not occur at the Cape of Good Hope, as given by Suter. 

 but is restricted to the east coast of Australia, as far north as the Peronian 

 region extends, and along the south and west in the limits of the Adelaidean 

 region. It does not extend to New Caledonia, as far as I have traced, but 

 is abundant at Norfolk Island, and very rare at the Kermadecs. 



The Cape of Good Hope shell which has been confused with it is Trochia 

 cingulata (Linne). The adults bear a superficial resemblance, but the im- 

 mature and juvenile shells differ entirely, and prove that no close relation- 

 ship between the two shells, which I place in different genera, exists. The 

 variety " textiliosa " puzzles me greatly, as it occurs under the same environ- 

 mental conditions, and is continually a stouter shell. May the difference 

 be sexual ? 



