DUKING JULY AND AUGUST, 1907. 239 



ACANTHODORIS SUBQUADRATA, A. .fe H. 



Voyage XCIII. Station 77. Off Holy Island. 32 fathoms. 1 specimen. 



The single example obtained agreed exactly with the description 

 and plate of Alder and Hancock, 



LAMELLIDORIS BILAMELLATA (Linn.). 



Voyage XCIV. Station 47. Lat. 53° 28f N. Long. V 



1 specimen. 

 Voyage XCIV. Station 52. Lat. 53° 30' N. Long. 1° 



. 3 specimens. 

 Voyage XCV. Station 24. S. edge of the Coal Pit. 



common. 

 Voyage XCVL Station 24. Lat. 54° 16' K Long. 1 

 Fairly common. 



All the specimens but one were living among colonies of Balanus, 

 upon stones of various sizes. 



In colour they were perfectly normal, and agreed so well with their 

 environment as to be extremely difficult to detect, and repeated search- 

 ing of the colonies of Balanus was necessary to obtain all the specimens 

 present. 



The only marked variation was in the case of a specimen living 

 upon a colony of Alcyonium digitatum, growing on a stone covered 

 with Balanus, on which normally coloured specimens of L. hilaindlata 

 were living, ' This one specimen was of a very clear white, the only 

 dark marks being two obscure and shadowy patches on the mantle, 

 and a slight dusky shade on the brancliiie. 



The largest specimens were not more than 16 mm. in length. It 

 was observable that the branchite increased in number with age. 



GONIODORIS CASTANEA, A. & H. 



Voyage XCIV. Station 54. The Sole Pit. Lat. 53° 40' N. Long. 1° 28' E. 

 47 fathoms. 1 specimen. 



Colour pinkish white, shaded with yellow. Ehinophores with 

 yellowish laminae and yellow tips. 



Cloak more or less warted all over, the central and transverse ridges 

 strongly warted, a double row on the central one. 



Jaws showed through the tissues of the head as a broad purple 

 patch. Branchiae 7, pinkish brown, with a few white spots, especially 

 near the bases. 



The upper part of the foot paler than the mantle and with smaller 

 tubercles. 



