DOTONID.E. 59 



merous, large, inflated, smooth, transparent, showing a narrow 

 brown central gland, which is bifurcated above ; the tips are 

 of an opaque bluish white, with a brilliant metallic lustre ; 

 the papillae are thickly set on the sides and round the head in 

 front without apparent order, meeting behind near the tuber- 

 cular vent, beyond which an opaque-white line extends to the 

 tail : foot rather broad, deeply grooved in front, and extending 

 to a pointed tail behind. L. 1*5. 



Habitat : On most parts of our coast, especially towards the 

 south and west ; not common. 



2. A. hya'lina, Alder and Hancock. 



A. hyalina, A. & H. Brit. Nud. Moll. fam. 3, pi. 44. f. 8-12. 



Body elliptical, pellucid yellowish-white, with reddish-brown 

 markings : dorsal tentacles rather short, stout, and obtuse, fawn- 

 coloured, spotted with brown and white ; they are obliquely 

 laminated, and united at the base by a semicircular crest of the 

 same colour : oral tentacles short, proceeding from a semicircular 

 veil : branchial processes numerous, elliptic- oblong, tapering 

 to a blunt point, and strongly mucronated on the upper por- 

 tion ; they are pellucid, sprinkled with brown and opaque- 

 white, and showing a stout, central, fawncoloured gland, which 

 extends about two-thirds up ; they are densely and irregularly 

 arranged on a ridge round the back and head : foot strongly 

 grooved in front, with the lateral angles rounded. L. 0*4. 



Habitat : Hilbro' Island, mouth of the Dee, Cheshire (By- 

 erley [and Collingwood]). 



This species comes very near to Proctonotus mucroniferus, 

 from which it principally differs in the characters of the dorsal 

 tentacles and crest, peculiar to the genus Antiopa. 



Family V. DOTO'NID.E [*]. 



Mantle wanting : tentacles 2, dorsal, with sheaths : branchial 

 processes ovate, muricated, set in a single series on each side : 

 mouth without jaws. 



[ * A purist would say, " Doto'idce,"] 



