Carinella Irilinedla, SipMmculus Dentdlii. 233 



flattened, gradually narrowed, posteriorly distinctly annulose, 

 about a foot in length, and one eighth of an inch in breadth, 

 when at rest; but capable of being drawn out to three times this 

 length, when, of course, it becomes proportionally attenuated. 

 It has neither tentacula, nor bristles, nor feet of any sort ; nei- 

 ther could I perceive pores in the margins or ventral surface. 

 The head is formed of two segments which are shorter than 

 the others; and the anterior is marked with a white band, 

 and rounded at the tip, where a small slit marks the situation 

 of its toothless mouth. There are no eyes. The third and 

 fourth segments are elongated, but the rest are nearly equal, 

 being, when at rest, about one eighth of an inch in length, and 

 in breadth ; the proportions, however, varying much according 

 to the degree in which the body, or particular portions of it, 

 are extended. When magnified, the margins appear finely 

 crenulate. The anus is simple and terminal. 



Carindlla trilineata was found within a coarse tube attached 

 to an old valve of the Venus islandica * of British authors. 

 The tube was about 4 inches long, formed of a membrane, 

 smooth, and iridescent internally, but coated on the outside 

 with gravel and pieces of broken shells, and open at both 

 ends. I have found a very different worm in a similar tube ; 

 so that a doubt may, perhaps, be entertained, whether the 

 Carinella fabricates it of himself, or is merely a tenant at will. 

 From the body being distinctly annular, the worm is brought 

 in contact with the Annelides ; but its softness, the want of feet 

 or bristles, the apparent simplicity of its structure, and its re- 

 semblance to the tapeworms, and more especially to the Lineus 

 longissimus of Sowerby, favour its claim to be placed among 

 the Vermes. Indeed, at the end of the first order of intestinal 

 worms in the liegne Animal of Cuvier, I find two genera 

 indicated ; the Tubulaires of Renieri, and the Ophiocephales 

 of Quoy and Gaimard, to which our worm is evidently 

 nearly allied, and to the latter of which I might have referred 

 itj had any notice been taken of the annulations of the body. 



11. Siphu'nculus Denta^lii Gray. (Jig*25.) 

 (Spicilegia Zoologica, part i. p. 8.) 



After his description of the Dentalium entalis, the Rev. 

 Dr. Fleming adds : — " The shell, inhabited by a Siphun- 

 culus, the characters of which have not been determined, is 

 frequently found entangled in the skate lines in the estuary 

 of the Forth." (Edinburgh Philosophical Journal, vol. xii. 

 p. 239. 1825.) The worm here so cursorily alluded to has 



* Cyprirca islandica Fleming, Cypr'ma vulgaris Sowerby. 



