120 
THÉEL, NORTHERN AND ARCTIC INVERTEBRATES. I. SIPUNCULIDS. 
Plate X. 
Figs. 146—150. NSipunculus priapuloides KOREN and DANIELSSEN. Same locality as before. 
Fig. 
146. Inner view of the body-wall, showing part of an interspace between two longitudinal 
muscular bundles just where a communication between the »canal» and the body-cavity 
takes place. 589. 
df. diagonal (muscle?) fibrils. — Im. longitudinal muscle bundles. — 0. one of the transverse 
openings, caused by the peritoneal membrane having turned inside in order to line the »canal». — 
om. oblique musele bundles. — sp. side prolongations of the longitudinal »canal». — tm. trans- 
verse muscles. 
147. Transverse section through the above-mentioned interspace between two openings. 29 
1. lumen of the canal. — Im. longitudinal musclebundles. — om. oblique muscle bundles. — 
tm. transverse muscles. 
148. Sample of skin from the middle of the body, to show the small groups of rounded 
corpuscles. Stamed in hematoxylin. The muscles have been removed. 56. 
149. Piece of skin from the posterior end of the trunk. Undyed. 36. 
150. Body opened along the dorsal surface, to show the internal organisation. 4. 
a. anus. — d. divertiele. -- de. coils of the intestine running downwards. — dr. dorsal retractors. 
gl. glandular bodies investing the anal muscles. — m., fixing muscles. — ne. nerve-cord with 
its ramifications. — oe. oesophagus with its vessel. — s. segmental organs. — 80. Sensory 
pit. — uc. coils of the intestine running upwards. — vr. ventral retractors. 
Figs. 151—152. Onchnesoma Steenstrupii KOREN and DANIELSSEN. Skagerrack. 
g. 151. ÅA piece of the skin from the posterior extremity of an almost smooth-skinned animal. 130. 
p. papille in connection with glands. — sc. inerusted irregular elevations of the skin, forming 
series of longitudinal rows posteriorly on the body. 
152. The same of an animal, with the surface of the skin rather rough. Lettering as before. 139. 
