Mr. J. Miers on the genus Anthotroche. 435 



good faith of Dr. Gray's observations, I am irresistibly led to the 

 conclusion that the opercula assigned by him to Diplommatina 

 were adventitious, and that if not assignable to the young of 

 Alyccms strangulatus which is found abundantly in company with 

 Diplommatina, they must belong to some other shell, and have 

 become accidentally mixed with specimens to which they did not 

 originally belong. 



Since the publication of the observations contained in p. 286 

 of the ' Annals ' for April, I have inspected specimens of Di- 

 plommatina minor, Gr., and am fully satisfied that it has no real 

 connexion with Diplommatina. The aspect of the aperture is 

 quite Cyclostomatous ; that of Diplommatina is far from being so. 

 Pfeifi"er calls it a dubious species ; I have no hesitation in reject- 

 ing it from the genus, and consider that if it should be, as is 

 most probable, provided with an operculum, that circumstance 

 will in nowise affect the question as regards the true species. I 

 add a note on the characters. The aperture is circular, and at 

 once indicates a Cyclostoma ; the peristome is interrupted above 

 and is double ; the inner lamina, which is subporrect and ex- 

 panded, being divided from the outer reflected lip by a sulcus. 

 The two upper whorls alone are closely and obtusely costulate, 

 the rest are smooth ; there is no trace of an internal plica. The 

 doubling of the peristome is effected in a different manner from 

 that of the Diplommatince, in which the retro-relict second lip is 

 only visible laterally, and not in front as in Cyclostoma minus. 



In Mr. Gaskoin's two specimens of the Australian Diplomma- 

 tina, the internal columellar plica is to be detected. 



London, May 1853. 



XLI. — On the Genera of the Tribe Duboisiese. 

 By John Miers, Esq., F.R.S., F.L.S. 



[Continued from p. 381.] 



Anthotroche. 



This genus was first made known by Endhcher in his ' Genera 

 Plantarum,^ p. 1404, his short description of the only species 

 being pubUshed in his ' Nov. Stirp. Mus. Vindob.' p. 7. It 

 was placed by him among the Salpiglossidece, but referred by 

 Mr. Bentham to Solanacece, no doubt because of the more iso- 

 merous structure of its flowers. I first called attention in 1849 

 to the singular fact of the extrorse position of the stamens, and 

 confirmed the general analogy of its characters to Anthocercis. 

 Lately it has been noticed by M. A. DeCandoUe, 'Prodr.' xiii. 676, 



