OP CONCHOLOGY. 19 



apex, and the somewhat prominent carina formed by the internal 

 groove, which causes an emargination of the anterior edge, readily 

 distinguish this from the other species of the genus. The lines 

 of growth are impressed and moderately strong. 



It is noticable that the apex is dextral, while in Gr. excentriea 

 it appears from the figure to be sinistral. The latter is reported 

 to inhabit corals in deep water, and it is possible that the animal 

 may prove to diiFer from the true Gadinice, as living in such 

 situations it can hardly be an air-breather. 



Gadinia excentrica, Tiberi. 



G-adinia excentrica, Tiberi, Journ. de Conchyl. 1857, p. 37, 

 pi. ii, fig. 6, 6a. 



Testa ovalis, oblique conoidea, glaberrima, nitens, striis exi- 

 lissimis longitudinaliter et transversim decussata ; vertex excen- 

 tricus, posticus, oblique recurvus, infra apicem lateraliter situs, 

 apertura ovalis ; margo simplex, acutus. (Tiberi.) 



Hah. Mediterranean, on the coasts of Sardinia. 



This species presents marked points of difierence from all 

 other described species of the genus, in its smooth exterior and 

 twisted apex. It is said to be found in the masses of coral 

 brought up by divers in the Mediterranean. The animal is un- 

 known, and needs examination. 



This completes the list of species of this genus as far as I have 

 been able to ascertain. They are widely distributed over the 

 world, but appear to be almost entirely confined to the eastern 

 coasts of the two great oceans. 



Woodward speaks of the Red Sea as affording a species, but I 

 have not been able to find any description of a Gadinia from 

 that locality. 



Genus DESLONGCHAMPSIA, McCoy. 



DeslongchaTnpsia, McCoy, MS. in Morris and Lycett, Mon. Gt. 



Ool. Moll. p. 94, pi. xii, f. 13, 1850. 

 Hemitonia, Woodw. (non Swains.), Man. Rec. and Foss. Shells 



(in errata), p. 151, 1851-56. 

 Deslongchampsia, Chenu, Man. de Conchyl., p. 376, f. 2819- 



20. (^ ot ^= Metoptoma, Phil., 1836, as Chenu avers.) 



D. testa orbiculata, conica ; apice subcentrali, versus marginem 

 anticum inflexo ; costulis radiantibus, antico sulco lato longitu- 

 dinali in laminam appendiculatam producto. 



Shell suborbicular, conical ; apex acute, subcentral, curving 



