132 WORMS. MOLLUSCA. 14-18.- 



14. ASCIDIA. 



60. A. rustica* Oblong 1 , brownish with flesh-colour aper- 

 tures, rough at the extremities, smooth in the middle. 



The ocean. Br. Zool, iv. t. 23. /. 3.5. Barbut t. 5. /. 4. 



Body nearly cylindrical, flat underneath, turned up at one end , 

 about 2 inches long* 



61. A. mamillariit. Somewhat parallelipiped, whitish: 

 apertures terminal, of the same colour as the body. 



Cornish coast. Pall. Spirit* Zocl. 10. p. 24. /. i./ 15. 



Body very irritable, variously shaped, wrinkled and gibbous, here 

 and there fprinkled with foft bristles, dirty white,coriaceous; nipplf 

 of thJ apertures hemifphserical) rich fcarlet within, 



15. DERRIS. 



62. D. sanguinea. 



Pembrokeshire coast. Linn. Trans. 3. /. ig./L i. 2i 



Body cylindrical, mostly tapering to a point behind, jointed and 

 capable of great flexibility, covered with a membranaceons tranf- 

 parent coat through which the internal parts are visible : head ex- 

 tended beyond the outer skin, lefs than the anterior part of the 

 body, to which it is connected by a membranaceous covering form- 

 ing a neck -.feelers white, feated on the top of the head, capable of 

 being raifed or deprefsed at pleafure : mouth with 2 lips, the upper- 

 one hooked andjnoveable, the lower straight and fixed. 



16. HOLOTHURIA. 



$3. H. Pentactes. Body with 5 longitudinal rows of tu- 

 bercles, and 10 ramified tentacula. 



The ocean. Br. Zool. iv. f. 26. /. 41. Barbut t. 6,/. 6. 



Body about 6 inches long, cylindrical, a little incurved, greenish 

 brown : tubercles hollow, in pairs, with a fmall retractile filament 

 from each : tentacula elegantly ramified, yellow and filver, reddish 

 at their tips. 



17. TEREBELLA. 



6i. T. conchilega. whitish, with numerous filiform cirri 

 round the mouth j the upper-ones very long : bran- 

 chiaa rich red. 



Pall. MiscelL Zool. t. g.f. 17. Br. Zool. iv. ft. 24. 

 Within the fabella conchilega, about 5 inches long* 

 Body flat, tapering towards the tail, pellucid, above reddish : heal 



armed with 4 fcales beneath : tube or case taper, straight, compofed 



of minute particles of agglutinated fand, about the si2e of a goofe- 



quill, and nearly half a foot long. 



18. LTMAX. Snail, Slug. 



65. L. ater. Body black, furrowed and wrinkled. 



Woods, Gardens, &c. Barbut t. 3./. 1. 



Body about 3 inches long, narrower at each end> cofivex on the 

 back, paler and flat beneath : shield rough with numerous dots. 



66. L. rufus. Above dull reddish, beneath whitish. 



Damp shades. Barbut. tab. 3 ./, 2. 



Body hardly 2 inches long, slightly furrowed, withot fpots or 

 belt : large r feelers black above 



67. It.Jlavus. Amber-colour, with whitish spots. 



In herbage Barbut. tab. Q.f. 4. 



Bodyzn inch and a half long, prominent oh th* back hollowed 

 underneath, slightly wrinkled. 



