280 APPENDIX. 



The colour is white, speckled with sulphur yellow ; it lives 

 amono' algae in the lower levels of the littoral zone. 



Vol. iii. p. 289. Odostomia insculpta. 



The animal is opaque frosted white, with a rather large patch 

 of dull claret red on the neck. The " rostrum " is short, closer 

 to the eyes ; with the segments arcuating as in 0. ohliqua. The 

 tentacula coalesce at their bases, and are very broad and short ; 

 they terminate in very small white slightly inflated tips ; the 

 eyes are close together at their internal bases. The foot is 

 bluntly auricled in front. The operculum is horn-coloured, nar- 

 row, and subelongated. This description is extracted from Mr. 

 Clark's account of specimens taken on a shelly bottom in fourteen 

 fathoms water, six miles from shore at Exmouth. 



Vol. iii. p. 291. OnosTOMiA obliqua. 



Taken alive in twelve fathoms, off Exmouth, by Mr. Clark, 

 " The rostrum is short and cloven in the centre almost to the 

 eyes. The tentacula are strong, rather long, subrotund and taper, 

 terminating with minute circular snow-white spots or inflations 

 on the tips ; the eyes are close together at the internal basal 

 angles ; the great peculiarity attached to the tentacula is, that 

 instead of a moderate divergence on each side of the rostrum, 

 they form large arcuations, and are carried at right angles with 

 the shell. The foot is rather concave in front, auricled long and 

 broad. The operculum is elongated and narrow." 



Vol. iii. p. 292. Odostomia Waurenii. 



Mr. Clark has taken this species alive in fourteen fathoms 

 water off" Exmouth. " The rostrum is short cloven as far as the 

 eyes, having the segments curved to the right and left ; the ten- 

 tacula are short, triangular, bevelled, not broad, attenuating to 

 a fine point, and armed with small white inflated tips; the 

 eyes are close together at the internal united bases. The foot is 

 short, concave in front, slightly auricled, posteally terminating 



