132 BULLETIN OF THE HUREAU OF FISHERIES. 



F.imily C. PHYLLIDIADJ-:. 



Body subcoriaceous, oval or (■lniii,Mt(-n\.il, siilHlcprcssed. Head indistinct, oral aperture pciv.- 

 like, tentacles short, connate at the Ikim', lonniim a vciv sliort veil above the oral aperture, sulc:ili'. 

 <ligitiform or depressed, free, rarrly i l'lniin.li,.i,:<,.< i allixcd; rhinophores retractile into sheaths, th- 

 clavns perfoliate. Ends of body almost equally rounded. Notseum dilated in its whole circunil'ii- 

 ence, the pallial margin everywhere extending beyond the foot. Back almost always uneven, tubci- 

 culate; the tubercules forming mid-dorsal longitudinal series or arranged in quincunx; the halu <ii 

 the anterior tubercules of the lateral scric"-- juTfurated by the rhinophores or contiguous to them; thr 

 halo of the posterior median series -.nus /"./;. ,:,! excepted) perforated by the anus or contiguoiis t^. 

 it. * * * External portion of tlir uiplii ,vi, I,, of mantle margin smooth, the inner portion bearint; 

 thin transverse brnnfhial lamellte, interrupted in front by the depression for the head, on the riulit 

 side by tin- 21 nilal ].apilla. Anal aperture postero-median upon the dorsum or, rarely (Fryer'ni). 

 between maiii !.■ aii.l h«i{, the cylindrical rectal tube projecting from its cavity, a groove on its ri!.'l)t 

 side leading \>vViv. to the renal pore. Sides of body low, the foot w-ell developed, narrower, ami 

 shorter than the mantle. 



Oral tube large, suctorial, pyriform, symmetrical (usually), or asymmetrical on account of a 

 regular or irregular glandular nias.s covering it; behind continued into the long, cylindrical pharyntiial 

 bulb, destitute of mandibles and radula. Posterior end of liver not cleft. Penis armed with a serii- 

 of hooks. 



Family D. POLYCERID.^. 



Branchiie of jiiunate iilumes arranged in an arc or circle, united or se|>aralc at their lia-^es, ncvn 

 retractile into a cavity. C'hivtis of rhinophores usually jicrtoliate. Pharyngeal JiuUi sometimes with 

 a sucking crop. 



Subfamily XL POLYOERIINai, 



Body more or less elongate and limaciform; dorsum scarcely set off from the .sides, or witli a 

 [jrominent lateral margin; frontal limb more or less prominent, simple or ornamented with simple or 

 composite appendages; pn each side of the dorsum often either a single dorsal appendage (branchial) 

 or several simple or composite ones in a series along the margin. Rhinophores with or without 

 sheaths, the clavus usually perfoliate. Branchiai of few plumes, the plumes often composite. Ten- 

 tacles small, loVielike, foldlike, or auriculate. Foot not wide, usually rounded in front. Pharyngeal 

 liulli simjile. P.nccal cavity usually armed with mandibular lamina? (often made up of minute rods 1. 

 Hliachis of radulu usually naked; the larger lateral teeth uncinate, the external ones simple, usually 

 without hooks, (ilans penis armed witli a series of hooks. 



Genus 10. XGIRES Lov^n. 



Mjires Lovcn. Ofvers. Votensk.-Akademiens Forh., 1, 181.5, p. 49. Ind. moll., 1.S16, p. 6. 



MgiTus LoviSn, Alder and Haneock, Monogr. part IV, 1.S48, fam. 1, pi. 21; part VI, fam. 1, pi. 17. fi.ss. 13-15; part VII, 



185.5, p. 44, XIX, pi. 46 sup., fig. 17.— G. 0. Sars, Moll. reg. arct. Norv., 1S78, tab. XIV, lig. lOab. 

 .^ires, Bergh, Beitr. z. Kenntniss dor Polyceraden, II, 1880, Verh. d. k. k. zool.-bot. Ge.s. Wien, XXX, p. 649. System der 



Nudibr. Gasteropoden, 1892, p. 140. 



Body somewhat limaciform, robust, rigid, with numerous tubercules above, mostly in rows; frontal 

 margin narrow, tuberculate; pallial margin inconspicuous, tuberculate; clavus of rhinophores simple, 

 their sheaths oblique; tentacles small, lobiform; branchije of few- tripinnate leaves, each one protected 

 by a peculiar individual lobe. 



Labial disc with a band of minute rods close to the buccal aperture below; a large mandible 

 present above. Radula moderately wide; the rhachis naked; pleurae with many uniformly hooked 

 teeth. Glans penis armed. 



