002 MR J. T. CUNNINGHAM AND MR G. A. RAMAGE ON THE 



number of long simple filamentous tentacles. The prostomium has two 

 prominent margins, one anterior and the other posterior, and on the surface 

 between these the tentacles arise. On each side the prostomium runs out 

 into a lappet or lobe, which increases the tentaculiferous surface. Next 

 follows the buccal somite, which is well developed, but not otherwise remark- 

 able. Then follow three somites, each bearing a pair of branchiae. The 

 branchiae consists of a number of branches arising from a short, rather thick 

 stem, which is directed forwards, and bears the branches on its posterior 

 surface, and each branch immediately divides into two or more filaments, which 

 are somewhat long, and are spirally curled, especially when contracted ; the 

 whole forms a large bushy plume or brush. The first notopodial fascicle of 

 chaetae is borne on the 3rd branchiferous somite. There are 24 pairs of noto- 

 podial fascicles ; behind the 20th post-buccal somite they are absent : in one 

 specimen, however, a single fascicle was present on one side on the 27th post- 

 buccal somite. The chaetae have a peculiar point or blade : there is a well- 

 developed pair of lateral wings which extend to a short distance from the end, 

 the rest of the blade being slightly curved and minutely denticulated on the 

 concave side. The series of tori uncinigeri begins at the 4th post-buccal 

 somite, and extends throughout the body, the posterior ones becoming shorter 

 and much more prominent. The uncinus is short, and provided with tendons : 

 it has 3 or 4 minute teeth on the outer edge of a single large one. On the 

 ventral surface of each of the first 14 post-buccal somites, there is a single 

 median " scutum ventrale," of which the last is small and rudimentary: the 

 others occupy the whole ventral region of the somite between the ventral ends 

 of the neuropodial tori (PL XLIII. fig. 23, 23 a, 23 b). 



Habits. — Common between tide marks among Laminarian roots and under 

 stones: it lives in mud, and does not form a very perfect tube; the mud 

 in its immediate vicinity is merely glued together by the secretion of the 

 worm's body to form a case. The worm reaches a considerable size, some of 

 our specimens being over 15 cm. long and 12 mm. broad in the anterior part. 

 Malmgren also gives these as the maximum dimensions. Specially fine 

 specimens are abundant on the shore at Joppa. 



Anatomy. — There are 15 to 17 pairs of nephridia in the first 15 to 17 post- 

 buccal somites. As in Trophonia, there are median vertical vessels passing 

 from the ventral vessel to the intestine. In the anterior portion of the body 

 the dorsal vessel is represented only by a perienteric sinus, which is most 

 developed on the ventral side of the intestine, but at the extreme anterior end 

 this sinus opens into a free dorsal contractile vessel forming a heart. This 

 heart contains a cellular cardiac body, as in Trophonia {vide PL XLIII. fig. 

 23 c). 



