206 ARICIAD^. 



low-water mark, burrowing in the fine soft mud which Unes the 

 fissures. Its motions are slow. When placed in a saucer, it keeps 

 itself rolled up in an imperfectly circular manner, lying upon its side, 

 and the painful efforts made to change its position, and with little 

 or no success, show too plainly that it is not organized to creep 

 about like the Annelides errantes, but, on the contrary, that its 

 proper habitat must be a farrow similar to those of the Tubicolous 

 worms, to which, in structure, it evidently approximates in several 

 particulars. 



Plate XVIII. Fig. 1. Leucodore ciliatus of the natural size. 2. The same 

 magnified. 3. An antenna more highly magnified. 4. The bristles 

 of the fifth segment. 5. A branchial process separated to show the 

 cilia. G. A few of the oviform bodies which lie between the intestine 

 and skin. 



** No tentacula-hke antennae. 



26. EPHESIA. 



Ephesia, Rathke in Nov. Act. Acad. Nat. Curios, xx. 176 (1843). 

 Ray Soc. Rep. Zool. 1847, 507- Grube, Fam. Annel. 6^ . 



Char. Lumbriciform ; the head indistinct, conoid, without an- 

 tennee : tentacular cirri none : segments all similarly furnished with 

 a single series of setigerous papillary feet, and with a parallel series 

 above of globular mammillated warts : bristles simple, few, rather 

 stout : anus terminal, without styles or papillae. 



1. E. gracilis. Length 2"; breadth V". 



Ephesia gracilis, Rathke in Nov. Act. Acad. Nat, Curios, xx. 176. 

 tab. 7- f. 6-8. Grube, Fam. Annel. G7- 



Hub. The coralline region. 



Desc. Worm lumbriciform, cylindrical, distinctly aimular, beaded 

 along the sides with a series of globular tubercles, of a uniform 

 wood-brown colour, 2 inches long, and not a line in breadth. Ante- 

 rior extremity narrowed, cylindrical, with an obtusely pointed apex, 

 where there is an aperture, but no soft apjiendage or visible organ. 

 Rings numerous, all alike, about equal in length and diameter, not 

 contracted at the dissepiments, each furnished with a prominent 

 white pearl-like mammilla, forming a series along each side, and 

 beneath it a parallel series of less obvious obtuse setigerous papillae 

 or feet. The mammillaj are of a dense structure, exactly globular, 

 but some of them have a very minute papilla on the top ; they 

 appear to be seated on a thickened portion of skin which connects 

 them, as it were, together ; and they seem to be immoveable, nor 

 have any appearance of a branchial organ. The feet are simj)le, 

 slightly prominent, obtuse, furnished each with four or five simple, 

 rather stout bristles in a fascicle. Posterior extremity suddenly 



