462 W. BLAXLAND BENHAM. 
on the left side indicate the true segments. The worm is represented as if 
the hinder part were slightly twisted round its long axis, so as to bring the 
side into view. B. The protruded clasper; the pores of the four pairs of 
male organs are shown (see also Fig. 2). m. Mouth. zp. Nephridiopore 
i. ch. Inner couple of cheete. 0. ch. Outer couple of chet. 
Fic. 2.—A portion of Fig. 1 enlarged (x 4), showing annuli and tertiary 
ringing of the segments. Annuli and true segments are indicated as before. 
B. The clasper. Z, 2,3. The curved ridge on its ventral face. 6. The 
pore on the left of the figure through which this organ is protruded. p', p?, p’. 
The three pores of the prostates or spermiducal glands and penial cheetophores. 
i. ch. Tuner couple of chete. 
Fie. 3.—The clasper of the same specimen seen from the outer surface, 
rather dorsally; the annuli are marked. 0. ch. Outer chete. 
Fic. 4.—View of the clasper of another specimen in a partially protruded 
condition ; the animal is seen partly from the side. 7, 2, indicate those parts 
of the ridge similarly numbered in Fig. 2. &. The pore through which the 
clasper is protruding. zp. Nephridiopore. %.ch., 0.ch., as before. The 
annuli are here numbered. 
Fic. 5.—The same partially protruded clasper seen antero-laterally ; a view 
nearly corresponding to Fig. 3. 
Fic. 6.—Diagrammatic representation of the relations of annuli, segments, 
and septa. The annuli are marked by Arabic numerals on the left; the seg- 
ments by Roman numerals on the right; the septa by thick lines; and the 
interannular furrows by fainter lines. The eight strong septa are indicated 
by small letters, a—A. The three anterior nephridiopores are represented 
as dots (zp.) on the right side. The characteristic copulatory organs are 
represented in their true position on both sides. 
Fic. 7.—The characteristic copulatory organs of the right side considerably 
enlarged. The annuli are indicated on the right, the segments on the left 
side. Pr, Pr?, Pr’, The three spermiducal glands, each a convoluted tube 
enveloped in a muscular sheath. p’. ch’. Penial chetophore connected with 
the first prostate. S. The “bursa propulsoria,” or sac containing the clasper. 
pr’. Its gland. m. Retractor muscle. sp¢h. Spermathecs. er. Position of 
the nerve-cord. 
Fic. 8.—The fully developed penial cheta (xX 35). Camera drawing. 
Fic. 9.—The free end of the penial cheta (x 180). Camera drawing. 
c. The denser cortical portion. m. The medulla. 7. The ring-like markings 
on the inner surface of the cortex. N.B.—The outline has suffered in reduc- 
tion of the drawing. 
Fic. 10.—An ordinary cheta (x 35). 
Fic. 11.—The tip of an ordinary cheta greatly magnified. The markings 
are represented too strongly. 
