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Eucalanus crassus is easily identified by its tumid body and very swollen, rounded, 
genital segment. The body is well covered with short stiff hairs. 
2. Eucalanus monachus Giesbrecht. 
Eucalanus monachus Giesbrecht, 1888, p. 333. 
Eucalanus monachus Giesbrecht, 1893, p. 132, pl. 11 & 35. 
Eucalanus monachus Giesbrecht & Schmeil, 1898, p. 21. 
Eucalanus monachus Wheeler, 1900, p. 167, fig. 4. 
Eucalanus monachus Cleve, 1901, p. 6. 
Eucalanus monachus Thompson & Scott, 1903, p. 242. 
Eucalanus 
Eucalanus 
Eucalanus 
Eucalanus 
monachus Cleve, 1903, p. 362. 
monachus Cleve, 1904, p. 189. 
monachus Sars, 1905(a), p. 2. 
monachus \Wolfenden, 1905 (a), p. 996. 
Eucalanus monachus does not appear to be so widely distributed throughout the oceans 
as the previous species. It was apparently rather limited in its occurrence in the region traversed 
by the ‘Siboga’ as shewn by the following records. 
Stat. 19. — Stat. 35. — Stat. 36. — Stat. 37. — Stat. 47°. — Stat. 66. — Stat. 75. — 
Stat. 93. — Stat. 98. — Stat. 99. — Stat. 101. — Stat. 110. — Stat. 117°. — Stat. 136. — 
Stat. 138. — Stat. 141. — Stat. 165. — Stat. 168. — Stat. 169. — Stat. 205. — Stat. 
2h —— Stat-w 3h. 
This Zzucalanus is distinguished from the other species by the broadly rounded and 
somewhat truncate outline of the head when viewed from the side. 
3. Eucalanus mucronatus Giesbrecht. 
Eucalanus 
Eucalanus 
Eucalanus 
Eucalanus 
Eucalanus 
Eucalanus 
Eucalanus 
mucronatus 
mucronatus 
mucronatus 
mucronatus 
mucronatus 
mucronatus 
mucronatus 
Giesbrecht, 1888, p. 333. 
CHET CSSIME, UIO)R, fo URA jOlS, Wir Se BE- 
Giesbrecht & Schmeil, 1898, p. 21. 
CHEWS, UGOIWN, De % 
Cleve, WOO2, js SOX 
Cleves 190045 =p: iso: 
Wolfenden, 1905 (a), p. 996. 
This species was moderately common in the ‘Siboga’ collections, and appeared to be widely 
distributed in the area investigated. It was found at the following stations. 
Stat. 36. — Stat. 37. — Stat. 47°. — Stat. 66. — Stat. 75. — Stat. 89. — Stat. 93. — 
Stat. 96 (night). — Stat. 98. — Stat. 99. — Stat. ror. — Stat. 106. — Stat. 110. — 
Stat. 1177. — Stat. 118. — Stat. 121. — Stat. 124. — Stat. 125 (day). — Stat. 128. — 
Stat. 129. — Stat. 133. — Stat. 136. — Stat. 138. — Stat. 141. — Stat. 142. — Stat. 
143. — Stat. 144. — Stat. 146. — Stat. 148. — Stat. 157. — Stat. 165. — Stat. 168. — 
Stat. 169. — Stat. 172.-— Stat. 177%. —.Stat. 184. — Stat. 185. — Stat. 186. — Stat. 
189°. — Stat. 194—7. — Stat. 203 (surface). — Stat. 203 (1500 metres). — Stat. 204. — 
Stat. 210%. — Stat. 213. — Stat. 215°. — Stat. 216. — Stat. 217 (horizontal cylinder). — 
Stat. 220 (vertical net). — Stat. 220. — Stat. 223. — Stat. 224. — Stat. 225. — Stat. 
230. — Stat: 243. — Stat. 245. —= Stat. 252, — Stat. 2714 —) Stale 270. Stat. 262-5 
Stat. 304. — Stat. 315. 
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