555 



(luctis in lobos triangulares depresses^ oculis ad eorura basin 

 externam. Pallium parte exteriore incrassata, tuberculis tribus 

 instructu, parte interna tenui, subuiatii, in sutura spirae disposita. 

 Pes brevis, linearis, antice truncatus. 



Testa cylindrica vel fnsiformi ; spira manifesta, apice papillate ; 

 sutura caualiculata ; columella callosa, uniplicata. 



Head subtrigonal, broad, anteriorly rounded, the sides pro- 

 duced into depressed triangular lobes, with the eyes at their outer 

 base. Mantle with the outer part thickened and furnished with 

 three tubercles ; inner part thin, subulate, concealed in the channel 

 of the spire. Foot short, Hnear, anteriorly truncated. 



Shell cyHndrical or fusiform, spire conspicuous, apex papillated, 

 suture channelled, columella callous, with a single plait. 



Bullina, Blainv. BuUina, sp., Macgill. Tornatella, sp., Kiener. 

 Bnllina, sp.. Say. Tab. I. Eig. 6, animal; fig. 7, shell. 



Genus 5. Utriculus, Brown. (Shells, sp. 27-31. pi. cxx. 

 f. 19-23.) 



Animal testa reconditum, crassum, latum. Caput latum, breve, 

 transversum; vibracula brevia, cornea, remota, lateralia; oculi 

 postici, minuti, immersi, remoti; labia tumida buccam formant 

 inflatam, verticalem, antice impressam, medio os prsebentem minu- 

 tum. Solea testa brevior, subquadrata, antice dilatata, truncata, 

 postice fissura media in lobos duos divisa. Margo pallii leviter 

 incrassatus, aperturam lambens. 



Testa buUacea, tenuis, ovata ; apex truncatus ; spira depressa. 



Animal contained within the shell, tliick, wide. Head wide, 

 short, transverse; tentacles short, conical, wide apart, lateral; 

 eyes posterior, minute, immersed, wide apart ; Hps tumid, forming 

 an inflated mouth, impressed anteriorly. Poot shorter than the 

 shell, subquadi-ate, anteriorly dilated, truncated, divided pos- 

 teriorly by a median fissure into two lobes. Margin of the mantle 

 slightly thickened, adhering to the aperture. 



Shell small, oblong-ovate ; outer lip nearly the whole length of 

 the last whorl, and entire ; spire very short, volutions prominent. 



Amphispki/ra, Loven. Diaphana, Brown. 



Genus 6. Akera, Muller. (Animal, pi. cxix. f. 4. Shells, 

 Bxdla, sp. 32-37. pi. cxxi. f. 40-46.) 



Animal. — Caput elongatum, antice latum, bilobatum, postice an- 

 gustatum. Oculi nulli. Suturam spirse depressse canaliculatum 

 explet pallium, connatum, cirrum emittens longum, tenuem, fili- 



4 c 



