NAVICELLA. 



Species 31. (Fig. a, h, Mus. Cuming.) 



Navicell.\ lineata. Nav. testa elongato-ovatd, ad 1a- 

 tera compressd, temii, diaphand, apice rostrnto, pel- 

 lucido-liiiescente, pnnctis nigris mijittiferh axperm, 

 ared columellari latiwsctild. 



The lineated Navicella. Shell elongately ovate, 

 compressed at tlie sides, thin, diaphanous, apex 

 bealjed, transparent yellow, sprinkled with black 

 arrow-headed dots, columellar area rather broad. 



Lamakck, Encyclopddie Mcthodique, pi. 450. f. 2 a,h. 

 Septaria naviculu, De Ferussac. 



Hab. Philippine Islands. 



The most elongated and transparent of the genus, 



marked with rays of arrow-headed black dots upon a 



transparent ycUowish gi-ound. 



33. (Fig. a, Ij, Mus. Cuming.) 

 Navicella Entrecastauxii. Nav. testa subeloiigato- 

 ovntd, ad latera compressd, apice rostrato, temd, suh- 

 diaphand, livido-rosed vet pellucido-olivaced, liiieis 

 nuieculatis reticnlantibus radiatd, ared columellari 

 pari'iusculd, arcuatd. 

 Entrecastaux's Navicella. Shell subelongately ovate, 



compressed at the sides, apex beaked, thin, subdia- 

 phanous, livid rose or transparent olive, rayed with 

 clouded reticulating lines, columellar area rather 

 small, arched. 



Recluz, Revue Zoo!. Soo. Cuvierienne, 1811, p. 380. 



Ilab. Point Entrccastaux, King George's Harbour, .Vus- 

 tralia. 



Of a similar transparent substance to the preceding 

 species, less elongated in form, of a delicate rose-yellow 

 tinge, retioulately rayed with black lines. 



Species 33. (Fig. a, h, Mus. Cuming.) 

 Navicella oeientalis. Nav. testa ovatd, ad latera 

 subcompressd, tenui, suhdiapJiand, liitescetite-grised, 

 puiirtis nigricautibus reticulatim aspersd, ared colii- 

 ueUari siibaiigustd, arcuatd. 

 The East Indian Navicella. Shell ovate, slightly 

 compressed at the sides, thin, subdiaphanous, yel- 

 lowish-grey, reticulately sprinkled with blackish dots, 

 columellar area rather narrow, arched. 

 Hab. Calcutta (in the Botanic Garden). 



A somewhat rudely compressed semitransparent shell, 

 faintly reticulately sprinkled with black dots. 



LATIA. 



Genus LATIA, Gray. 

 Testa tennis, subcornea, ovata, depresse pileiformis, vertice 

 oblique intorto, ■subrosfrato ; intus septo arcuato, mar- 

 giiie subreflexo, ad extremitatem imam acute producto. 

 Shell thin, rather horny, ovate, depressly cap-shaped, ver- 

 tex obliquely twisted in and slightly beaked ; interior 

 marked with an arched shelf, a little turned up at the 

 edge, which is sharply produced at one end. 

 The two little shells here figured with the Navicdlre 

 present a distinct typical character, partaking almost 

 equally in the general features of convolution and texture 

 with Ancylus. Dr. Gray, while distinguishing them in 

 our national collection by the generic title of Lafia, places 

 them near the latter genus ; but in the absence of any 

 knowledge of the animal, their position in the system 

 can only be a matter of conjecture. They are of thin, 

 olive or greenish, horny substance, with the spire obliquely 

 twisted in, having an opake white septum in the interior, 

 similar in a measure to that of Navicella or Cahjptrea, but 

 presenting a peculiar modification, the edge being slightly 

 bent upwards and prolonged at one end into a sort of 

 spine. 



Both species are from New Zealand. 



Species 1. (Fig. 34 a, b, Mus. Cuming.) 

 Latia Neeitoides. Lat. testa ovatd, Icevigatd, vertice 



tmnidiusculo, producto ; oUvaceo-cortieu. 

 The Neeite-like Latia. Shell ovate, smooth, vertex 



rather swollen, produced ; olive-horny. 

 Gray, MS. Mus. Brit. 

 Ihb. New Zealand ; Earl. 



This species, the smaller of the two which at present 

 constitute this genus, has the vertex the more swollen and 

 produced in proportion to the size of the shell. 



Species 2. (Fig. 35 a, b, Mus. Cuming.) 

 Latia lateealis. Lat. testd subquadrato-ovaid, subde- 



pressd, obscure later aliter sulcata ; virescente-corned. 

 The lateeal Latia. Shell somewhat squarely ovate, 



rather depressed, obscurely grooved at the side ; 



greenish-horny. 

 Gould, MS. Mus. Cuming. 

 Hab. New Zealand ; Hart, R.N. 



Rather larger than the jireceding species, and more 

 squarely depressed in general contour. The vertex is less 

 prominent, and the side of the shell is faintly grooved. 



