COXTRIBUTION TO THE KX( )\VT.EDrrK OF THE 

 NUDIBRANCHlIATE MOI.LrsK. ^IKIJBE 

 LEONINA (aoriJ))* 



PKOFESSOR H. P. YON" W. KJERSCHOW AGERSBORGi 



IXTRODUCTIOX 



The writer's attoiitloii \v;is dinwii to this rather 

 unusual type of molhjskaii lil'r {Mi 'ihr leouina) in ob- 

 serving the living animals . 11 tlir I'uuvt Sound Biological 

 Station, located at P'i-I(!a> llarlioi'. W'asliiiioton, during 

 the summer of 19U, and Inasinncli as little was known 

 concerning the species, an ctlori was tiiadc to assemble 

 such data as might l)e ot" iiitci-cst rclativr to its habits 

 and development. The results ot* this study are pre- 

 sented in tlie following pages. 



It was originally intended to publish these in connec- 

 tion with work on the m()ri)liologv of the specie's, now 

 under preparation, but owiiii;' to the extent of i he moi'plio- 

 logical data and the crowded condition of the morpho- 

 logical journals it seems he.st to lia\-e thi- other mattei- 

 appear separately. 



Taxonomy 



ThQ^diiu^Mellhe (Rang), togcthei- with 'I r tints ( Linne), 

 constitutes the family TethipHrl Ih/fia , which loi ins one of 

 the numerous groups of faniil\- rank included in the 

 sub-order Xndihranrliiata of the opi-t linl.ranehial e J/m/- 

 iN^^a. The t\p(' of the genus Mrlih, di^-oxuvd at 



the (';ipe ot" dood Hope aud described b\' llanu' in 1"^ "_'!>. 

 Nince that time ele\-en species have been added \arions 



