UTRICULUS. 1 1 



Genus UTRICULTJS, Brown. 



Head-disk very short ; tentacular lobes lateral, rounded ; 

 eyes none. 



Shell rather thin, sub-cylindrical, imperforate, covered 

 with an epidermis ; spire distinct, apex obtuse, not 

 mamillated, sutures simple, not canaliculated ; aperture 

 narrow behind, dilated and entire in front, nearly as 

 long as the body -whorl ; columella simple, not plicate ; 

 outer lip, straight, acute. 



St/fi. Retusa, Broicn. 



Ex. U. obtusus, Turton, pi. 56, fig. 7. 



These animals appear to delight in slimy mud-banks 

 near the mouths of rivers, where they may be observed, 

 on the retiring of the tide, crawling slowly over the yet 

 moist surface. The animal of the Bornean species, 

 observed by one of the authors, appeared to be devoid of 

 eyes, and to resemble the animal of Cylichna rather than 

 that of Diaphana, the shells of which those of this genus 

 very much resemble, but are more opaque, cylindrical, 

 and covered with an epidermis ; the genus is distinguished 

 from Tornatina in the suture of the spire not being 

 channelled, and in the simple inner lip. 



Species of Utriculus. 



Borneensis, A. Adams. obtusus, Turt. 



Cecillii, Phil. pertenuis, Miyh. 



