454 FISSURELLID^. 



Genus SCUTUS, Montfort. 



Mantle-margin simple, permanently more or less pro- 

 duced and covering the sides of the shell ; foot moderate, 

 smooth, with a series of short, lateral cirrhi. 



Shell depressed, oblong, shield-shaped, surface smooth 

 or striated ; apex at the hinder thii'd ; aperture with the 

 front edge truncate, arched, and slightly emarginate, with 

 an internal groove leading to the sinus; margin smooth, 

 rounded behind. 



St/)K Dascinus, Rq/ln. Parmophorus, Blainv. Par- 

 mophora, Desk. Scutifera, Blainv. Scutum, Sotc. jun. 



Ex. S. unguis, Linnceus, pi. 51, fig. 10. Shell, S. 

 unguis, fig. 10, a. 



The animal of Sciitus does not differ much from that 

 of Emarginula, but the shell is not fissured anteriorly, 

 and is, moreover, smooth, depressed, and sub-quadran- 

 gular, with the margin permanently covered by the re- 

 flexed border of the mantle. Tlie shells are all white 

 or devoid of colour, although the animal is black ; 

 the species are found in shallow water, and are not very 

 numerous; they are chiefly inhabitants of the Philippines, 

 Australia, and New Zealand. 



Species of Scutus. 



angustatus, A. Adams. granulatus, Blainv. 



australis, Blainv. imbricatus, Quoij and Ga'im. 



corrugatus, Reeve. tumidus, Qnoy and Gaim. 



clongatus, Lam. unguis, Linn. 



