64 NERITULA. 



ir. Africa)^ N. elongata =- iS. oriens ( China Sea.H), N. lucida 

 {KeeHng'x /s/.\ N. ^thiopica ( Kabenda, W. Africa), N, cm- 



GENDA. 



The following species are mentioned by name only in Marrat's 

 "Varieties of Xnssa." and I presume that they linAe not been 

 described. 



N. NIVIFER, N. INTERSTINC'TA, N. PORRUGATA, N. BK('EJ)IVA (Gape 



de Verds). 



In the " Varieties " I find the following specific names attributed 

 to other authors, but which do not appear to have been described : 

 X. LixEOLATA, Phil.; N. PUsiOLA, Dunker ( Viti Isles); N. sprela, 

 Watson (Amboina ; X. agapeta, Watson (Lavuka)-, N. angu- 

 LATA, Thorpe l China); X. brychia, Watson {Gomera, 620 

 fathoms); X. spills, Watson {Rain Isl., Torres Sts.); N. Baby- 

 LONiCA, Watson; X. bibalteata. Pease {balteata, Pse?); N. 

 EMERSA, Carp, (immersa. Cai'p. ?); X. Galtlea. Clark; X. oon- 

 FKRTA. ^Sfartens. 



(ionus NERITULA. I'liinrns. 



In Neritvln the last whorl is depressed and extends over the 

 penultimate whorl, neai'lv covering and concealing the spire, which 

 consequently appears A'ery obtuse. The animal has a bifid tail, 

 and operculum similar to Nassa. Risso's name Gi/clope has 

 been almost equally used for this group. H. and A. Adams' 

 genus Teinostonia was originally placed next to Nerifula^iti their 

 "Genera;" subsequently they removed it to the Rotellinae or 

 rmboniina'. 



X. NERiTKA, Linn. PI. 18, figs. 8.53-;].5«. Sf)!). 



Shell smooth and polished; fulvous minutely speckled with 

 chestnut-brown, with usualh- darker and larger markings, form- 

 ing a sutural band and another upon the periphery; the callous, 

 flattened columella, yellowish stained with brown, is spread out 

 in circular form covering the inferior surface to the periphery. 



Diam.. -5 inch. 



Mediterranean Sea. 



The shell has very much the appearance of a RoUdla, being 

 transversely flattened into a disk-like form. N. Italica, Issel, is 

 a synonym; I figure two examples of it to show the young and 

 half-grown states of the species (figs. 355, 356). 



