59 



anfractibus depressis fascid mediand brunned, ultimo antke rosea 

 fascid brunned ax'm cingente ; peristomate rotundato, rosea. 

 Axis 1 1^ dinin. 20 lin. 

 Hub. in Ceylon. 



This is one of the most beautiful of the genus. It approaches to 

 Nan. Javanensis, but is thicker and larger. 



Nanina striata. Nan. testd solidiusculd, subpellucidd, albidd ; 

 periostracd tenui, olivaced; spird cotivexiusculd, confertim trans- 

 verse striatd ; anfractu ultimo antice sublavi. 



Axis 9, diatn. 15 lin. 



Mr. Gray also exhibited an extensive series of Shells of the 



Genus Terebra, 



forming part of his own ^ collection, and illustrating an account of 

 many new species of that group which he presented. 



He stated that the animal has a small foot, and a very long pro- 

 boscis, at the base of which are seated two very small tentacula ; the 

 operculum is ovate, thin, horny, rounded behind, and rather taper- 

 ing in front. The shell is covered by a very thin, pellucid, horn- 

 coloured periostraca : it is usually white, variously streaked with 

 brown, the streaks being often interrupted or broken into spots 

 by the two spiral bands of the shell ; one of these bands is placed 

 near the spiral groove and the other on the middle of the whorl. The 

 apex of the cavity is frequently filled up by a calcareous deposition ; 

 but this deposition has never been observed in Ter. duplicata. 



The species may be divided into the following sections : 



I. Anfractibus sulco spirali cingulum posterius efformante ; labia in- 

 teriore tenui, concavo. 



Obs. Cingulum in junioribus magis conspicuum; labium internum 

 in adultis rarissim^ incrassatum. 



Huic sectioni referendae sunt 



Ter. mnculata. Lam. 



Ter. tigrina. — Buccinum felinum, Dillw. 



Ter. strigata, Sow. — Buccinum elongatum. Wood, Suppl,,/. 22. 



Ter. dimidiata, Lam. 



Ter. striatula, Lam. 



Ter.flammea, Lam. 



Ter. muscaria. Lam. 



Ter. subulate. Lam. 



Ter. oculata, Lam. 



Ter. crenulata, Lam- 



Ter. corrugata. Lam. 



Ter. duplicata, Lam. 



Tcr.pertusa, Sow. Born, Mus., t. 10. f. 13. 



Ter. nubeculata. Sow. 



Ter. myuros, Lam. 



Terebra Knorrii. Ter. testd turritd, subulatd, acuminatd, solidd, 



wu 



