560 GASTROPODA. [Opisthobranchia. 



cuticular blades, is as usual in the genus. It is composed of little 

 columns split into 3 or 4 denticles at the top, and presents a very rough 

 surface, almost like a radula. The formula of the radula is about 

 24x6+1 + 0+1 + 6. The first laterals are large, with rather 

 blunt tips, and bear 4-5 denticles. The second to fourth laterals are 

 erect, and retain the hamate form. The fifth and sixth are plates. 



Type in the British Museum. 



Hob. Auckland Islands (type) ; Sumner, near Lyttelton (H. S.). 



Remarks. Bergh thinks that his A. pilosa novce-zealandice is 

 probably identical with A. molicella, Abrah., and this view is shared 

 by Eliot. The latter, however, doubts if it is really the same species 

 as A. pilosa, though undoubtedly nearly allied. The dorsal papillae 

 are longer, and there are .differences in the rhinophore-sheaths, labial 

 armature, and radula. The internal organs are described by Bergh. 



Fam. DORIDIDJ3, Gray. 



Body of variable form, generally depressed. Mantle oval, covering 

 the head and the greater part of the body. Buccal tentacles ill- 

 developed. Branchiae generally retractile, on the posterior or medio- 

 posterior part of the back, usually forming a circle round the anus. 

 Skin strengthened with spicules, more or less definitely arranged. 

 Radula multiserial. 



Genus 1. DORIS, Linne, 1758. 



Doris, Linne, Syst. Nat., ed. x, 653. Type: D. verrucosa, L. Arc/ us, 

 Bohadsch, 1761. 



Body elliptical, depressed, rarely convex, covered]]by an ample 

 mantle, the surface of which is in most species tuberculated, and 

 the margins extend over the head and the sides of the foot ; variously 

 coloured. Head hidden by the mantle, furnished with an oral veil, 

 which is sometimes produced into 2 labial tentacles. Rhinophores 

 subclavate, laminate, retractile within a cavity. Branchiae tri- or 

 quadri-pennatifid, surrounding the vent, which is placed medially 

 on the posterior portion of the back. Genital orifice at the right side. 



The species of this genus inhabit for the most part the littoral 

 and laminarian zones, and appear to be carnivorous. They are found 

 in all parts of the world, and are often of large size and exquisite 

 beauty. 



Subgen. 1. ARCHIDORIS, Bergh, 1892. 



Archidoris, Bergh, Syst. d. Nudibr. Gasterop., in Semper's Reise Philipp., v 

 1092. Type : A. tuberculata, Cuvier. 



Animal of soft consistency, plump, and slightly depressed ; back 

 more or less granular or tuberculate, the openings for the rhinophores 

 simple. Tentacles short, thick folds at the sides of the small head, 

 with an external furrow. The retractile gill composed of a few tri- 

 or quadri-pinnate leaves. Foot broad, with a furrow at the anterior 



