and its Affinity loith Cjclophorus and Pupina. 79 



eight species oi Diphmmatinay and arranged them in my note- 

 book as follows : — 



I. Aperture in the plane of the axis of the shell, 



1. Peristome perfectly circular. Two species. 



2. Parietal lip meeting the palatal and columellar lips at an angle. 



Three species. 



II. Aperture lateral. 



1. Peristome impinging on the penultimate whorl, edentate. One 



species. 



2. Peristome impinging on the terminal whorl ; a tooth on the colu- 



mellar lip. 

 a. Shell fuU, large, sinistral. One species. 

 h. Shell narrow, minute, dextral. One species. 



At Norfolk Island I found a minute Diplommatina (PI. IV. 

 figs. 3 & 4) that would fall into the second division of the 

 foregoing table, the aperture being lateral. The peristome is 

 double, perfectly circular, and everted, the last two characters 

 as well as its minute size being characteristic. The operculum 

 (fig. 5) is quite circular, like the aperture, and regularly spiral, 

 with a curved ridge for muscular attachment towards its an- 

 terior border. 



In all the Dlplommatlnce, examined by me the eyes were 

 uniformly situated at the outer side of the base of the tenta- 

 cula, and even a little encroaching upon the head. I have 

 always recognized, also, that their labial and lingual dental 

 organs, like those of their near allies the Pupince^ were strictly 

 conformable to the Cyclophoroid and not to the Cyclostoma- 

 tous type, which two natural families are still further dis- 

 tinguished by the invariahle presence of otoconia in the ear- 

 sacs of the former ^ and single spherical otolithes in those of the 

 latter. 



I am borne out in my statement as to the position of the 

 eyes of Diplommatina by the remarks of Mr. W. T. Blanford 

 accompanying an outline sketch of the animal of an Himalayan 

 species by Capt. Godwin-Austen, published in the Ann. & 

 Mag. of Nat. Hist. 1867, vol. xix. p. 306. He says, " I have 

 more than once, within the last few years, called attention to 

 the circumstance that, in the two supplements to Dr. Pfeiffer's 

 admirable monograph of the living operculated land-shells, 

 the position assigned to the genus Diplommatina^ close to 

 Acicula^ and in a suborder distinguished by the position of the 

 eyes above the base of the tentacles, is not in accordance with 

 the structure of the animal ;" and, rcfen-ing to the figure, he 

 further adds, " The eyes, as will be seen, are distinctly lateral, 

 as in Cyclophorusr My own drawing (fig. 1), which was 

 carefully taken from nature, confirms this view ; and lest some 



7* 



