DORIS. 89 



very large, rather distant, clavate tubercles, interspersed with 

 smaller ones : dorsal tentacles robust, yellowish : head-veil 

 large, undulating : gills 11, set in a small incomplete circle or 

 ellipse. L. 0-5. 



HABITAT : Among stones between tide-marks, Bantry Bay, 

 where a single specimen was found by Mr. Norman in 1858. 

 It occurs on the coasts of Norway and Sweden. 



13. D. ULIDIA'NA, Thompson. 



D. Ulidiana, Thomps. in Ann. N. H. 1st ser. xv. p. 312 ; A. & H. Brit 



Nud. Moll. p. 42, and App. p. ii. 



BODY oblong, pale yellow : mantle with rather large, unequal, 

 depressed tubercles : dorsal tentacles long, slender, whitish : 

 head-veil large, semicircular: gills 11, beautifully white, set 

 in a semicircle : liver appearing of a dark colour through the 

 skin. L. 0-5. 



HABITAT: Three individuals of this species were obtained 

 by the late Mr. W. Thompson, of Belfast, on oysters brought 

 to Belfast Market from the coast of Down or Antrim. It does 

 not appear to have been since met with. 



14. D. DIA'PHANA, Alder and Hancock. 



D. diaphana, A. & H. in Ann. N. H. 1st ser. xvi. p. 313 ; and Brit. Nud. 

 Moll. fam. 1, pi. 10. 



BODY elliptical, very transparent, white : mantle with equal, 

 rather distant, clavate tubercles : dorsal tentacles linear, stout, 

 yellowish: head-veil undulating: gills 11, stout, yellowish, 

 set in an open incomplete circle : liver extending much for- 

 ward and appearing very large and black through the foot. 

 L. 0-5. 



HABITAT : Meadfoot sands, Torbay, where two specimens 

 were obtained in 1845 (Alder). [Falmouth (Cocks).] 



The last six species approach each other very closely, and 

 can only be distinguished by critical examination. 



