GENERA AND SPECIES. 117 



Dendronotus. (DENDRONOTIDJE.) Plate xxxii. 



599. arbonscens, i in. brown, spotted with white ; head-veil with 



four or more branched processes. 



There are two varieties of this lactea, which is white, and pulchella, which is pink. 



Dentalium. (DENTALIIDJE.) Plate xv. 



187. entalis, ij in. ivory white, no longitudinal striae towards 



narrower end, where there is often a slit. 



188. tarentinum, ij. in. creamy white, often pinkish at the point, 



longitudinal striae along lower half, plug 

 at posterior end, where there is never a slit. 



189. abyssorum, if in. white, banded with pale blue, longitudinal 



streaks at lower half, plug at posterior end. 



Of 187 there is a variety annulata which has white rings of growth ; and there is also 

 infuudibulum, which is shorter and more conical. 



Diplodonta. (LUCLNIDJE.) Plate vii. 



65. rotundata, lin.x^ 



Donax. (DONACID&.} 



104. vittatus, 



105. trunculits, 



1 06. folttus, 



white, periostracum yellowish, usually 

 remaining only in front. 



Plate viii. 



posterior margin obliquely truncate, longitu- 

 dinal striae crossed by transverse striae. 



posterior margin abruptly truncate.no trans- 

 verse or concentric striae. 



smooth, inner edge not toothed. 



Doris. (DORWID&.) Plate xxxiii. 



Gills united at base, and retractile within a cavity 



repanda, i in. gills 5. 



millegrana, ij in. gills 6, dorsal tentacles conical. 



zetlandica, f in. gills 6, dorsal tentacles linear. 



testudinaria, 2 in. gills 8. 



flammea, i in. gills 9, body scarlet. 



tuberculata, 3 in. gills 9, body orange or yellow. 



603. coccinea, % in. gills 10. 



johnstoni, if in. gills 15. 



Gills simply pinnate, non-retractile ; no oral tentacles 

 oblonga, J in. gills 7. 



pusilla, J in. gills 9, dorsal tentacles white. 



sparsa, J in. gills 9, dorsal tentacles white, blotched with 



brown, and with tubercles at base. 

 inconspicua, % in. gills 10. 



