on Zoology and Botany. 385 



formation will be observed. A.amhulacrumh defined as "globose, 

 with a canal around an acute spire, umbilicus plain within." 



PI. 373 contains two new Naticce. N.jJatula : " Hemisphae- 

 roidal, smooth; spire small, depressed; umbilicus open, con- 

 tainmg a spiral ridge;" found in the Suffolk crag. N. striata: 

 Subhemisphaerical, smooth: spire small, depressed; umbilicus 

 open, base concentrically striated. Mr. Sowerby's observa- 

 tion on the diiference between these two shells evinces much 

 judgement. We wish he had not followed the example of 

 Dr. Leach, in substituting the little-known and unmeaning name 

 of Acteon for that of Tornatella, as applied to the generic ap- 

 pellation of Valuta tornatilis. De Montford's system has 

 sunk into that oblivion it so justly merits, almost as soon as 

 it was built, and it may serve as a warning to those young 

 conchologists who fancy their reputation will be advanced by 

 opposing established authorities, and building up systems of 

 their own. TornatellaNoce, Tab. 374', as Mr. S. conjectures, ap- 

 pears a very uncertain species. The next Plate contains 3 shells. 

 Buccinum junceum {Murex jimceus of Brander). B. sulcatum : 

 Turrited, acute, transversely furrowed ; whorls ventricose ; 

 aperture ovate; lip toothed within. B. Mitrula: Tmrited, 

 acute, costated ; aperture elongated, obtuse above ; lip sharp- 

 edged with a small rounded sinus in the upper part. The 

 first and last of these shells, B. junceum and Mitrula, evidently 

 belong to the genus Pleurotoma of Lamarck. The descrip- 

 tions of the remainmg plates are postponed. 



So-iOe7-b7/s Genera of Shells. Nos. 7 and 8. 



We shall notice the genera contained in these Num- 

 bers in the order in which they follow in the letter-press. 

 Chama : the species represented on this plate are C/i. Da- 

 macornis, Arcinella, Lazarus and squamosa. Solenimya: 

 (a name judiciously adopted from Mr. Bowdich, in pre- 

 ference to Lamarck's Solemya,) consisting of two species, 

 to which Mr. S. has added a third with some doubt and 

 without any description. Isocardia: with figures of/. Cw, 

 Moltkiana and Basochianu. Iridina; a fresh-water genus of 

 great rarity, well described, and accompanied by a beautiful 

 plate of /. clongata. The author, however, is not aware of 

 a second S]iecies being figured by Bruguiere ; and a third has 

 recently fallen under our own inspection. Limnea: 'Mr. 

 Sowerby, as we before observed, has united the genera Lim- 

 nea and Phifsa of Lamarck and Draparnaud, together with 

 tiiose of Aplexa and Mijxas, all under this genus. We do 

 not at present concur in this alteration, being more inclined 

 to keep Limnea and PJnjsa distinct, attaching to the first the 

 sub-genus Aplexa, and to tlic latter that of Myxas : thus 



placing 



