64 NERITULA. 



W. Africa), X. ELONGATA =r X. ORIENS (China Seas), X. LUCIDA 

 (Keeling^ Id. i, N. .ETHIOPICA ( Kabenda, W. Africa), X. CIN- 



GENDA. 



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

 "Varieties of Xnssa," and I presume that they have not been 

 described. 



N. NIVIFER, N. INTERSTINCTA, N. OORRUGATA. N. HKCKDIVA (Cape 



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. LINEOLATA, Phil.; X. PUSiOLA, Bunker (Viti Isles); X. SPRELA, 

 Watson (Amboino .; X. AGAPETA, Watson \ Lavuku); X. A\<;r- 

 LATA, Thorpe (China); X. BRYCHFA, Watson (Gomera, f>2() 

 fathoms); N. SPILUS, Watson (Rain Isl, Torres Sis.); X. BABY- 

 LONICA, Watson; N. BIBALTEATA, Pease (balteata, Pse?); N., 

 EMERSA, Carp, (immvrsa, Carp.?); N. GALTLEA, Clark: X. CON- 

 FERTA, Martens. 



(M.-nus NERITULA, IManciis. 



In Neritula the last whorl is depressed and extends over the 

 penultimate whorl, nearly covering and concealing the spire, which 

 consequently appears very obtuse. The animal has a bifid tail. 

 and operculum similar to Nassa. Risso's name Cyclope has 

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

 genus Teinostoma was originally placed next to Neritula, in their 

 "Genera;" Subsequently they removed it to the Kotellimi' or 

 Umboniina'. 



X. NKIUTKA. Linn. P^. 18, figs. 353-35G, 359. 



Shell smooth and polished; fulvous minutely speckled with 

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

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

 Hattened columclhi, yellowish stained with brown, is spread out 

 in circular form covering the inferior surface to the periphery. 



Diam.. 'f> inch. 



Mediterranean $ca. . 



The shell has very much the appearance of a Rot'.'lla. being 

 transversely flattened into a disk-like form. A r . Itnlicn. Issel, is 

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

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



