MOLLUSCA. 39 



ones of the spire. A remarkable sharp tubercle is situated on the back of the 

 last whorl. 



163. Columbella pavonina, (Plate X, fig. 19, 20.) Testa obeso-ovata, polita, solida, pallida, 

 maculis vel strigis saturate rufis longitrorsum ornata. ; anfractibus subplanulatis, leeviter sulcatis, 

 ultimo magno, superne obtuse angulato ; spira exserta, acuminata ; apertura elongata; labio interno 

 producto. 



Inhab. ? 



The last whorl is proportionately large, solid, and shouldered, whence a com- 

 paratively small taper spire has its origin. The ground colour is white, but this 

 is handsomely varied by irregular blotches of a decided red, these maintaining a 

 longitudinal direction. The paper referring to its habitat has been accidentally 

 mislaid, but it is most probably from America. 



164. Columbella carinata, (Plate X, fig. 15, 16.) Testa, ovata, acuminata, laevigata, sub- 

 tenui, fusca, spira. nigricante ; anfractibus subrotundatis, ultimo superne carina obtusa. albida. cincto, 

 subtiis coarctato; labro inflexo, vix incrassato ; apertura nigra. 



Inhab. Bodegas and San Diego, California. In seven fathoms and under 

 that depth. 



165. Columbella lentiginosa, (Plate X, fig. 21, 22.) Testa, parva, ovata, nigricante, albo 

 conspersa ; anfractibus longitrorsum plico-costatis, infra, suturam fascia alba, cinctis, ultimo trans- 

 versim sulcato ; apertura nigricante. 



Inhab. Gulf of Nicoya. Associated in considerable numbers with. Columbella 

 pygmcea under the stones of the beach. 



Beneath a magnifying power, the speckled appearance of this little shell 

 becomes resolved into numerous regularly disposed articulated transverse bands, 

 separated by furrows. These are most conspicuous on the last whorl, as on the 

 spire they are interrupted by the rib-like folds. 



Trichotropis. Broderip et Soiverby. 



166. Trichotbopis cancellata, Hinds, Proceed. Zool. Soc. 1843, p. 17, (Plate XI, fig. 11, 12.) 

 Testa oblonga; anfractibus senis, rotundatis, costatis, valde cancellatis ; costis setosis; anfractu 

 ultimo infra subplanulato ; sutura profunda ; apertura rotundata, ad basin truncata; umbilico parvo 

 lineari, labio interno fere occulto. 



Inhab. Sitka, North-west America. Dredged in the harbour from a sandy 

 bottom, in from five to seven fathoms, together with T. inermis. 



Shell oblong, the spire more produced than in T. bicarinata ; the whorls 



