Doms. 223 



is turned over ; then we find a long disc, constituting the 

 foot, with the mantle spread far bejond it on both sides, 

 and in front round the head, which is not very distinct, but 

 is furnished with two pointed tentacula. With the rest of 

 his genus and family the Boris planata lives among sea- 

 weeds, but is carnivorous in his diet. 



The other species do not differ much from the above. 

 In L. Johnsfoni, which is of a pale yellowish tint and much 

 scalloped at the sides of the mantle, the bunch of gills is 

 expanded into a beautiful flower; D. coccinea and B.flam- 

 mea are both of a splendid red, tinted with lighter orange; 

 B. rejmnda and B. diaphana are delicately white, with slight 

 tints; B. pusilla is brownish-grey, covered with conical, 

 dark tubercles, and has a very beautifully laminated, rather 

 long pair of dorsal tentacles ; B. sparsa is of a light yellow- 

 ish tint, sprinkled with spots of bright reddish-brown. The 

 remaining species are — B. tubercidata, B. nlideana, B. as- 

 pera, B. bilamellata, B. ohlonga, B. depressa, B. inconspicua, 

 B.ptilosa, B. subquadrata. Some of the species lay their 

 conglomerate masses of spawn in the form of a coiled ri- 

 band, and others in that of a thread. 



Letting these pass by, we next observe two lengthened 

 slugs, presenting a very different aspect from the preceding. 



