SOME ABNORMAL ANNELIDS. 437 
first somite and the second abnormal ring of the trunk, which 
we have marked 75. The dorsal pore between the two ab- 
normal rings 74 and 75 is removed to the right, so that it 
lies rather in a curved series from the trunk into the right 
terminal than in the straight series of the trunk and main 
terminal. When, however, the dorsal body-wall is removed and 
viewed from the ventral aspect, having been made translucent 
by glycerine, we see, as in fig. 4, that the dorsal pores of the 
right terminal B are not really in the series of the trunk H; 
while the latter are in the same series as those of the main 
terminal T. The slender muscles or groups of longitudinal 
muscle-fibres that pass from one dorsal pore to the next are 
seen to bend, from the pore 74—75 over towards the animal’s 
right to end at the pore 75—76, crossing the darkly pigmented 
band of 75 and half the light bands 74—75 and 75—76. The 
muscle that runs up from the lateral terminal becomes lost in 
the general dorsal muscle and is not connected with any other 
pore than the one 1—2 whence it starts. 
The ventral view, fig. 3, together with fig. 2, shows the true 
shape of the abnormal rings 74 and 75. While 74 appears but 
slightly notched on its left side, it is subdivided ventrally by a 
groove coming down from the right side; it is a ring much 
wider on the left than ontheright. So the ring 75 is, inversely, 
much wider on the right than upon the left; it is marked ven- 
trally by grooves that but imperfectly separate it from the 
somite | of the right terminal. The two abnormal rings 74 and 
75 together make a cylindrical mass of less diameter than the 
trunk or the main terminal. It is from the expanded right 
side of this second ring, 75, that the right terminal arises, while 
the main terminal is continued from its distal face. 
As is seen in the ventral view, the parallel lines that mark 
those thin areas of the body-wall muscle along which the 
ventral setz are inserted, continue from both trunk and main 
terminal out into the lateral terminal, or in other words, the 
right line of ventral sete is continued as the right or anterior 
line of ventral setz of the lateral terminal, and the left or pos- 
terior line of ventral sete of the lateral terminal is continuous 
