130 THE NAUTILUS. 



Enseta Adams with the species barnesii Gray, cumingi Brod., 

 pedersenii Verrill, cylleniformis Sowb., archeri Angas, reevei Dall, 

 guildingii Sowb. 



Plejona Bolten containing species " conchologically related to the 

 F. spinosa Lamarck." 



Caricellinae : Adelomelon Dall, with the species ancilla Sol., sub- 



nodosa Leach, benthalis Dall, martensi Strebel, magellanica Lamarck, 



ornata Lahille, beckii Brod., tuberculata Swainson, brasiliana Sol., 



ferussacii Donovan, paradoxa Lahille, stearnsii Dall, philippiana 



Dall. 



Zidona H. and A. Adams with the species angulata Swainson. 



Tractolira Dall with the species sparta Dall. 



Aurinia H. and A. Adams with the species dubia Brod., robusta 

 Dall, gouldiana Dall. 



Maculopeplum Dall with the species junonia Hwass, dohrni Sowb. 



Volutomitrina, : Volutomitra Gray with the species gronlandica 

 Beck and alaskana Dall. 



Owing to the scarcity of specimens, we do not realize that on the 

 coasts of North and South America there are 33 recorded species. 

 There are considered to be two centers of distribution for the Amer- 

 ican species, the southern end of South America is taken as one 

 center and the Antilles as the other. The paucity of species along 

 the Pacific coast north of south latitude 40 is remarked upon. 



Under the genus Aurinia, typified by A. dubia, Dr. Dall says : 

 " This genus is the degenerate descendant in one line, as Maculopep- 

 lum is a normal descendant in another, from the Eocene Caricella. 

 Its most prominent feature is the enfeebled plaits of the pillar, 

 usually of diminished number as well as size, its thin shell and prom- 

 inent Caricella-nucleus. The absence of the radula it shares with 

 Maculopeplum, though Holla, evidently a close relative, and even 

 more degenerate as regards the shell, has retained the radula." The 

 type of the genus Maculopeplum is the well-known Valuta junonia 

 Hwass. 



In his note on the Volutida which appeared in THE NAUTILUS 

 for April, 1906, Dr. Dall calls attention to the fact that the type of 

 Swainson's genus Volutillthes is not Voluta spinosa but Voluta mur- 

 icina Lam. This point was ably confirmed by Mr. R. Bullen New- 

 ton 1 in June, 1906. 



1<( Note on Swainson's Genus Volutilithes," Proc. Malac. Soc., Loud., June, 

 1906, p. 100. 



