80 polyceridjE. 



base : gills 10, short, equal in length, forming a circle : foot 

 broad. L. 0*5. 



Habitat : In deepish water, Cullercoats (Alder) ; Bray, 

 Ireland (Ball) ; Birterbuy Bay, not uncommon (Barlee). [W. 

 Sweden (Loven).] 



4. I. in.equa'lis, Forbes. 



/. inaqualis, F. & H. iii. p. 579, pi. YY. f . 4 ; A. & H. Brit. Nud. Moll. 

 p. 46, and App. p. v. 



Body grey, speckled with yellow and brown : mantle incon- 

 spicuous, with four unequal filaments in front, the exterior 

 ones longest ; lateral filaments short, four or five on each side 

 near the gills : dorsal tentacles linear, stout : gills 9 (the ante- 

 rior one bifid), slender, diminishing posteriorly. L. 0*6. 



Habitat : Dredged by Forbes and others on the eastern and 

 western coasts of Shetland, in 35-80 f. It comes very near 

 to the last. 



5. I. ptjlchella, Alder and Hancock. 



I. pulchella, A. & H. Brit. Nud. Moll. p. 19, and App. p. v. 



Body ovate, freckled with pale lilac : mantle small, produced 

 in front, with four filaments set on an expanded pallial or velar 

 ridge ; lateral filaments five or six on each side, the last large 

 and bifid : dorsal tentacles clavate, laminated for three-fourths 

 their length : gills 11 (the anterior one bifid), rather small, 

 diminishing posteriorly. L. 0*4. 



Habitat : A single specimen was dredged by Mr. Barlee at 

 St. Ives, Cornwall, in 1853. [W. Sweden (Loven).] 



6. I. quadricornis, Montagn. 



Doris quadricornis, Mont, in Linn. Trans, xi. p. 17, pi. 4. f. 4. I. qua- 

 dricornis, A. & H. Brit. Nud. Moll. p. 46, and App. p. v. 



Body ovate, depressed, mottled with brown and white : 

 mantle indistinct, with two long filaments in front (one at the 

 base of each tentacle) ; lateral filaments small, tubercular : 

 dorsal tentacles very long, linear : gills 8 or 9, small. L. 0*4. 



