doridopsid.e — polycerid^. 375 



Family DORIDOPSIDJE. 



Z>oris-like Mollusca, without well-developed spicula in the in- 

 tegument, with mouth suctorial, opening on the front margin of 

 the foot, with a retractile proboscis, but destitute of odontophore, 

 jaws, or spinous collar. 



The absence of an odontophore, so generally possessed by the 

 cephalophorous Mollusca, justified Messrs. Alder and Hancock 

 in raising this group to the rank of a famil}^ 



DoRiDOPSis, Aid. andHanc, 1864. 



Syn. — Doriopsis, Pease, 1860. Rhacodoris, Morch, 1863 (part). 

 Haustellodoris, Pease, 1871. 



Distr. — 72 sp. Universal. Z). yiHcZts, Pease (xc, 100). 



Body more or less depressed, ovate or elliptical. Mantle 

 ample, covering the head and foot, smooth or with soft tubercles 

 and without marginal appendages. Rhinophores laminated and 

 retractile within cavities. Head indistinct, generally with two 

 small lateral lobes, but without proper oral tentacles. Branchiae 

 generally ramose, retractile with the anus into a common 

 cavity. 



DORIOPSELLA, Bcrgh. Distinct from Doridopsis by its some- 

 what rigid and granulated mantle. D. areolata, Bergh. 



Family POLYCERID^. 



Mantle small or obsolete, generally with marginal appendages, 

 integument usually spiculose. Rhinophores various, often lami- 

 nated. Messrs. Alder and Hancock divide the Polyceridse into 

 two sections, according as the rhinophores are retractile or non- 

 retractile. This gives a convenient arrangement. 



§ A. Rhinophores retractile within sheaths ; the odontophore 

 broad. {Euryglossse.) 



MiAMiRA, Bergh, 1874. 



Distr. — M. nobilis, Bergh, Australasia. 



Mantle (nothseum) anteriorly produced into a frontal veil, and 

 furnished with lateral flattened lobes, lamellate below, behind 

 continued into a caudal veil, above keeled and with transverse 

 ribs. Oral aperture armed with a spinous buccal collar. Odon- 

 tophore broad, with numerous series of teeth, many of them 

 multidentate ; the rachis armed. — Bergh. 



Casella, H. and A. Ad. 



Distr. — 2 sp. Australasia. C. Gouldii, H. and A. Ad, 

 (xc, 2). 



Body compressed, elongated. Mantle-margin small, forming- 

 undulated lobate or erect crests along the sides of the back. 



