PLATE XXXVIIa. 
The Lettering is the 
6. Cuticle. 
c. Hypoderm. 
d. Circular muscular coat. 
e. Dorsal longitudinal muscles. 
/. Ventral longitudinal muscles. 
g. Oblique muscles. 
j. Alimentary canal. 
same in all the Figures. 
]c. Tufts of spines and bristles. 
n. Nerve cords, 
r. Reproductive organs. 
V. Ventral channel. 
vs. Ventral blood-vessel. 
X. Base of foot. 
Fig. 1. Transverse section of tlie body- wall of Trophonia ivyvillei in the 
ventral median line. Two of the long papillge are covered with 
Diatom ooze, ....... 
Fig. 2. Nerve-area of Nicomache capensis in transverse section, with the 
united insertions of the oblique in the middle line superiorly. 
V, section of loops of ventral vessels, .... 
Fig. 3. Transverse section of the body-wall of Praxilla hdlliheri. 
Fig. 4. Transverse section of the anterior third of Praxilla assimilis, 
Fig. 5. Nerve-area of Praxilla abyssorum, ..... 
Fig. 6. Transverse section of the anterior third of the body- wall of Phyllo- 
comus croceus, Grube, ...... 
Fig. 7. Transverse section of the posterior region of Loimia savignyii, 
Fig. 8. Section of the ventral margin in the anterior third of Praxilla 
hdllikeri, in which the parts have been stretched so as to 
demonstrate the neural canal, ..... 
X 90. 
X 90. 
X 55. 
X 55. 
X 138. 
X 20. 
X 40. 
X 55. 
