Genus Latirus. 393: 



columellar plaits. Through P. flavida (Ad.) (fig. 5) and 

 Mariei (Crosse) we approach P. incarnata (Desh.), a well- 

 marked species of gaudy coloration, also infracincta 

 (Kobelt), so allied to it that I cannot but place it here, 

 though for both it and annulata (Bolten) (fig. i) some 

 conchologists might, and perhaps with good reason, find a 

 place in Latirus^ near Syracusanus L, P. Brazieri (Angas) 

 like infracincta in form, is conspicuous for absence of 

 columellar plaits. 



Now begin the range of mostly small species allied to 

 ustulata (Reeve), the majority of which have an indigo or 

 brown stain at the base ; there is more variety here, and 

 more difficulty, than in other sections of the genus. 



Lastly come P. chlorostoma^ striata, and allies ; a very 

 beautiful little assemblage of shells, and extremely variable. 

 One form, Selince (fig 7), I have given a separate description 

 to in this paper, a very beautiful form, allied closely to 

 stigmataria (Ad.), which seems near P.Australiensis (Reeve), 

 in its disposition of markings. P. Iniuensis and Wagneri, 

 which come last, both have crenulated outer lips ; I there- 

 fore admit them as true Peristernice with a little diffidence, 

 there being many points, it is true, in common, but also 

 certain Engina relations which we wait for the knowledge 

 of the lingual ribbon to verify. 



I am sure, however, that PauluccicE (Kobelt), pulchra 

 (Reevej, Carolines {}L\Qr\) ziz Ricinula bella (Reeve), and 

 others formerly included in this genus are Engines^ and so 

 exclude them here. 



One instance will suffice. P. CarolincB (Kiener). 

 It will be noticed that by the Ricinula-like or colum- 

 belloid mouth, and the distinctly different line of painting 

 and ribbing, that there is much more affinity between 

 them and say Engina histrio, than with any Peristernia. 

 The dentition of Engina is widely distinct, and it is to be 

 wished that some student would make a special study of 



