270 Mr. E. A. Smith on neiv Species of TerebridsB. 



infra, ornata ; anfr. 11, convexiusculi, costis validis, arcuatis, vix 

 obliquis, superne subtuberculatis (in anfr. ultimo 18-20 sensim 

 ad basim obsoletis) instructi, et transversim inter costas exilissime 

 striati, infra suturam leviter contracti ; apertura parva, zonis* 

 duabus fuscis intus ornata ; columella paululum obliqua, fusca, 

 labio callo tenui juncta. 

 Long. 10 mill., diam. 2|. 



Hah. ? 



A very small species, chiefly distinguished by the narrow 

 brown band beneath the suture and the two which encircle the 

 body-whorl. There is a slight depression at the upper part 

 of the whorls, but scarcely forming an infrasutural belt ; and 

 the upper ends of the ribs terminate somewhat nodulously. 



Myurella tantilla. 



M. testa minuta, elongata, alba, zona angusta dilute brunnea suturam 

 infra (in anfr. ultimo duabus, altera suturam infra, altera periphe- 

 riam infra) cincta ; anfr. 8, convexiusculi, superne paululum 

 constricti, costis loiigitudinaHbus, arcuatis, validis, superne tuber- 

 culatis (in anfr. ultimo 15 fere basi continuis), instructi, trans- 

 versim inter costas concinne striati ; apertui'a parva ; columella 

 curta, subrecta ; canalis brevissimus. 



Long. 6| miU., diam. 2^. 



Hah, Japan [A. Adams). 



This is one of the smallest, if not the most minute, species 

 in the genus. There is a slight contraction or spiral depression 

 a little below the suture, which, traversing the ribs near their 

 upper extremities, produces the appearance of a series of 

 nodules ; this feature, together with the small size and the 

 style of marking, will easily define this form. 



Subgen. Abretia. 

 Ahretia aiitarctica. 

 A. testa parva, breviter subulata, fusca, inter costas epidermide tenui 

 cretaceo induta ; anfr. 10, convexiusculi, nee dimidiati nee trans- 

 versim striati, costis lougitudinalibus, fiiscis, arcuatis, obliquis, 

 subremotis (in anfr. ultimo 13 versus medium obsoletis) instructi, 

 incrementique lineis striati ; apertura parva, fusca ; columella 

 brevis, subrecta. 

 Long. 14 mill., diam. 4^. 



Hah, Antarctic region. 



This species, of which there are six examples in the 

 Museum, was obtained during one of the Antarctic expeditions. 

 The precise locality is not attached to them ; but they have 

 that peculiarity (a dull ashy or chalky aspect) which is so 

 usual in shells from those freezing latitudes. 



