1880.] NATURAL SCIENCES OF PHILADELPHIA. 119 



Adalaria virescens, Bergh. 



4. a, esophagus, with its dilatation ; b, salivary gland ; e, its 



duct. 



5. Ganglion penis,"^ ^j-. 



Adalai'ia Loveni (A. and H.). 



6. Median part of the radula from above, with (aa) large lateral 



plates ; 66, innermost part of two rows of external plates, 

 with 1-5 plates,* ^^. 

 1. Large lateral plate, from the side,* ^^^. 



8. Piece of the left part of the radula;* ^f^ a, two median 



pseudo-plates or bosses ; 6, large lateral plates ; c, two in- 

 complete rows, with 6-7 plates. 



Adalaria albopapillosa (Dall). 



9. a, (2) median pseudo-plates ; 66, (2-3) large lateral plates of 



both sides,* ^K 



10. a, (3) median pseudo-plates; 66, (2-4) large lateral plates of 



both sides ; c, innermost part of three (right) rows of ex- 

 ternal plates, with 3-4 plates ; (Z, (left) row of 7 external 

 plates,* ^K 



11. Four outermost plates of a row ; a, outermost,* ^-f-. 



Acanthodoris pilosa (0. Fr. Mtiller). 



12. End of the everted penis ; a, opening,* ^f^. 



13. Epithelium of the vagina,* -f^. , 



Acanthodoris pilosa^ var. albescens (Pacijica). 



14. a, anterior margin of the foot ; 6, edge of the tentacle. 



15. Ganglion genitale from the penis,* if^. 



Plate III (XI). 



Acanthodoris pilosa (Miiller). 



1. Three external plates; a, outermost,* ^f^. 



Acanthodoris pilosa, var. albescens. 



2. The genital opening with its everted margin ; a, the two fore- 



most apertures. 



