U T R I C U L U S. 



Genus Utricui.is. Broini. 



Testa BullcBformis, tenuis, mbcyliiidracea, spird con- 

 spicud, hrevissiind, anfractibus proviinentibus, 

 aperiiird elongatd, lahio externa suprd, medium 

 producto, columelld tenui, mblortud. 



Shell Bulla-shaped, thin, subcylindrical, spire con- 

 spicuous, short, whorls prominent, aperture 

 elongated, outer lip produced above the centre, 

 columella subtortuous. 



The difference between this genus and Tornatina is 

 to be sought, not in the shell but in the animal, or rather 

 in the relation of one to the other. In the former 

 case the animal is enclosed within the shell. Of the 

 six species, three are British, one Mexican, one 

 Bornean, and the last of the United States. 



Species 1. (Mus. Brit.) 



Utricuh-s I'ELLUCiDus. Utr. testd oblique ovato-siib- 

 globosd, minutd, pellucidd, ventricosd, lavi, post 

 columellam s^lb^cmbilicatd, lateribus suprd medium 

 recliusculis, spird subquadrata, brevissinid, anfrac- 

 tibus, apice vmrnmillato : aperturd ampld, postice 

 coarctatd, antice dilatata. 



The pellucid Utriculus. Shell obliquely ovate- 

 subglobose, minute, pellucid, ventricose, smooth, 

 subumbilicated behind the columella, sides rather 

 straight above the middle ; spire subquadrate, 

 very short, with three whorls; apex mammil- 

 lated, aperture large, narrowed at the back, ex- 

 panded in front. 



Brown. 



Amphispira hyalina, Liiven, 



Bulla canda, Macgillivray. 



Hob. British Islands. 



Species 2. (Fig. a, b, Mus. Jeffreys.) 



Utriculus globosus. Utr. testd parvd, candidd, Icevi- 



gatd, pellucidd, oblique ovatd, ventricosd, versils 



spiram subattenuatd, post columellam s^ibum- 



bilicaid; spird umbilicald, anfractibus ccelatis ; 



October 



aperturd pyriformi, lahio externa suprd spiram 

 elevato. 



The globose Utriculus. Shell small, white, smooth, 

 pellucid, obUquely ovate, ventricose, slightly at- 

 tenuated towards the spire, subumbilicated 

 behind the columella ; .spire umbilicated, whorls 

 concealed ; apertui'e pyriform ; outer lip raised 

 above the spire. 



LiiVEN. Ind. Moll. Scandinavia;, p. 11. 



Uah. North Britain. Scandinavia. 



The only species of the genus which does not show 

 the whorls of the spire. 



Species 3. (Mus. Cuming in Brit.) 



Utriculus CECiLi.ff:. Utr. testd cylindricd, lavi, tenui, 

 epidermide olivaced indutd, lonffituditialiter sub- 

 striatd, spird distinctd, parhm elevatd ; anfrac- 

 tibus quinque, suturd corrugatd ; aperturd angustd, 

 antice dilatatd ; columella arcuatd. 



Cecilia's Utriculus. Shell cylindrical, smooth, thin, 

 covered with an olive epidermis, longitudinally 

 slightly striated, spire distinct, a little elevated ; 

 whorls five, suture corrugated ; apertr.re narrow, 

 dilated in front, columella arched. 



Philippi. Enum. Moll. Sicilios. 



Hah. Mediterranean. Mexico. 



The most narrowly cylindrical of all the species. 



Species 4. (Mus. Cuming in Brit.) 



Utriculus pertenuis. Utr. minutd cylindraced, al- 

 bidd, temiissimd, hyalind, spird discoided, anfrac- 

 tibus quatuor rotundatis, suturd distinctd ; labro 

 ad terminum spiralem recto, infra rotundato ; 

 aperturd postice angustato ; columelld rectius- 

 culd. 



The very thin Utriculus. Shell miuute, cylin- 

 draceous, whitish, very thin, hyaline ; spire dis- 

 coidal with four rounded whorls; suture dis- 

 tinct ; outer lip quadrate at the spiral end, 



1870. 



