LuciNOPSis. 437 



By that gentleman we have been furnished with the ac- 

 companying description and sketch. — Animal lentiform, 

 subcompressed, mantle open, margin plain, produced pos- 

 teriorly into two short siphonal tubes, separate from their 

 bases and divergent. The branchial one is conical, pale 

 yellow, with sulphur-coloured, flaky, irregular, subrotund 

 blotches, marked with short dark lines around the orifice, 

 giving it the appearance of a minute fringe ; from this 

 circle spring about fourteen rather long white cirrhi. The 

 anal tube is also conical, shorter than the branchial, bluish 

 hyaline, and quite plain at the orifice ; these tubes are 

 never protruded more than one-sixth of an inch, at least in 

 the specimens examined, and are very delicate to external 

 view, but on opening the animal they appear long, strong, 

 cylindrical, corrugated, of the same length, lying parallel to 

 each other at nearly the middle of the shell in the large 

 vertical sinus in the mantle. The body is very small, pale 

 brown, with a moderately long hyaline lanceolate foot at- 

 tached to it. On each side the body is a pair of suboval 

 almost hyaline branchia;, the upper the smallest, most de- 

 licately pectinated ; also small triangular palps more 

 strongly striated, but of the same hyaline character. 



Lucinopsis undata inhabits sandy ground, from a very 

 few fathoms to as deep as eighty fathoms, rarely plentiful 

 any where, though very generally distributed around the 

 coast. Among localities may be mentioned Exmouth 

 (Clark); Southampton (Jeffreys) ; Weymouth in seven 

 fathoms, and Dartmouth in twenty-seven fathoms (M'An- 

 drew and E. F.) ; British Channel (Jeftreys) ; Isle of Man 

 in twelve to twenty fathoms (E. F.); Scarborough (Bean); 

 Northumbrian coast, in deepish water (Alder) ; on the 

 edge of the Dogger bank, sixty miles east off Sunderland in 

 fifty fathoms water (King) ; Sana Island in forty fathoms 



