• 



:o8 WORMS. MOLLUSCA. 40. Derris. 41. Holothum. 



'Body hyaline, 2 \ inches long, with an opake yellowifh nucleuj 

 covered with whire pellucid gluten: tail enfiform, more than 

 twice the length of the trunk, and furnifhed with a double 

 fcmicordate fin. 



40. DERRIS. Body cylindrical, compofcd; 



of articulations: mouth terminal: feelers 2) 



Spnguinea Derris. 



•7 anjaft, Linv. Soc. iii- p. 6?. ta\>. I 3 fig, I, 2. 



Inhabits the Coaft of Pi'mbrokejiiire. 



fio*ey cylindrical, gradually tapering to a point behind, compofecj 

 of joint? and capable of great flexibility ; covered with a mem- 

 branaceous tranfparent coat, thrqugh which the internal part$ 

 arc vi(i: > e; head extended beyond the outer SKin, lefs than 

 the anterior part of the body, to which it is cojinecled by a 

 membranaceous covering forming a neck : feelers white, fau- 

 lted at the top of the head, ard capable of being raifed or 

 deprefled at pleafure : mouth confiding of t lip?, the upper- 

 one hooked and moveable, the lower-one ilraight and fixed. 

 Jt moves by an undulatary motion of the whole body. 



•H. HOLOTHURIA. Body detached, cy- 

 lindrical, thick, naked, and open at the 

 extremity: mouth furrounded by flefhy 

 branched tentacula, or feelers 



Thefe are all inhabitants of the fca, and expand or contract them- 



felves at pleafure: the anterior aperture ferves them both as 



a mouth and a vent, and from thc^hinder one they rcje<fl 



waters which had been previoufly fucked in : the tentacula are 



retractile. 



Elegaus, With 10 branched tentacula. : body papjllous., above reddifhj, 



beneath white. 

 Mull. Zed. Dan- Y.p. I.jfff* \*fig> I — 3. 

 Qy,nner Jc~, Sccckb. 1767. tab. \» fig. 3* 

 • Inhabits the Northern Seas, and fqui'rts out water like a fiphen 



from the lower orifice; S<— t 1 inches long. 

 Body varied with' red' and white: popillee pointed difhnr, thotc 



of the' back 'difpofed in 6 rows: tjutaruia fleihy white, the 



tip furniflicd with ?. tuft of fibres which are tuberculate 



wit|iin.* ' 



