63 



Legrand has re-examined for me, and gives it as his opinion 

 that it is a decided species of Liotia. 



Cyclostrema, Marryat. *Messrs. Adams restrict the 

 genus to non-nacreous shells, with an acute entire aperture, 

 otherwise like Liotia. The type species is cancellate, though 

 many are smooth. 



Adeorbis, Searlcs Wood, 1842 (Mag. Nat. Hist., vol. IX., 

 p. 530). The principal difference between this genus and 

 the last, according to Messrs. Adams, is in the non-discoid 

 trochiform shape, and the non-continuous labrum. 



Sub-family, Umhonihice. — Operculum horny, thin, of many 

 whorls, gradually enlarging, outer edge finely ciliated ; shell 

 orbicular, depressed porcellanous, the umbilical region often 

 callous. 



Umbonium, Link, 1807 (Beschr. Eost. Samml. 3, p. 

 136.) Thus Hermanssen, who regards this genus as 

 synonymous with Schumacher's (not Sowerby's) Globulus^ 

 which has a host of other names, dating back as far as Klein. 

 The shell I described as Ethalia tasmanica, should certainly be 

 an JJmhonium. 



Sub-family — TrocJiince. Operculum horny, of numerous 

 narrow whorls, nucleus central shell. Conoidal or pyramidal, 

 last whorl more or less angular at periphery, usually fiat 

 beneath, aperture transverse, wider than long. 



The genus TrocJius, as restricted by Messrs. Adams, would 

 not include any Tasmanian form. I formerly placed two 

 species in this division, which I shall now for reasons to be 

 stated further on, arrange with Trocliocochlea. 



Clanculus. — A genus of Montfort (Conch, system, vol. II., 

 p. 190.) synonymous with Fragella, Swainson, Clangulus, 

 Blainville, and Otavia Risso. It is a very good genus, and as 

 restricted by Messrs. Adams, is perfectly recognizable. The 

 shell is solid, turbinate, granular, last whorl rounded, aperture 

 thick and both lips have conspicuous teeth, often many. It is 

 well represented in Tasmania. 



EucHELUs. — Philippi. Zeitschr. f. Malak. Feb., 1847, 

 p. 20 (from G-r. eu well xvH a pier, whatever that may 



^Messrs. Adams spell the name Marryatt, and give no reference. On 

 referring to Dr. Hermannsen's Indicis Genera Malacoz, I find the following 

 reference : — "Marryat teste Montague, 1817, Trans. Linn. Soc, XL, p. 194." 

 He adds that he had not verified the reference, but took it from Fleming. 

 He also adds : — " 1818, Trans. Linn. Soc, XII sec, Agass." I don't 

 understand the meaning of this last, but the true reference is : — " F. 

 Marryat, descript. of two new shells, 3Iitm zonata and Cyclostrema cancel- 

 lata, Trans. Linn. Soc, vol. XII., p. 338." I presume that Hermannsen took 

 his second reference from Agassiz's, ISTomenclator. 



