19 



tooth in l 'ndinala darwini^ is one-third from the base, and two-thirds from the distal end of 

 the spine. 



So far as the records shew, this Calanoid appears to be limited to the Pacific and Indian 

 Oceans. ( )nly the males have yet been discovered. 



2. Family Eucai axidak. 



Genus Eucalanus Dana, 1852. 



The members of this genus are easily distinguished from those belonging to the other 

 genera of this family, by the entire absence of a fifth pair of feet in the female. The frontal 

 part of the head is not produced into a beak-like prominence. The last abdominal segments 

 and furcal joints are not separated. Seven species of Eucalanus were found in the material 

 collected by the 'Siboga', one of which appears to be undescribed. 



1. Eucalanus crassus Giesbrecht. 



Eucalanus crassus Giesbrecht, 1888, p. 333. 



Eucalanus crassus Giesbrecht, 1S93, p. 132, pis. 4, 11, 35. 



Eucalanus crassus T. Scott, 1897 (a), p. 312. 



Eucalanus crassus Giesbrecht & Schmeil, 1898, p. 22. 



Eucalanus crassus T. Scott, 1900, p. 3S2. 



Eucalanus crassus T. Scott, 1901, p. 236. 



Eucalanus crassus Cleve, 1901, p. 6. 



Eucalanus crassus Wolfenden, 1902, p. 361. 



Eucalanus crassus A. Scott, 1902, p. 401. 



Eucalanus crassus T. Scott, 1903, p. 110. 



Eucalanus crassus Thompson & Scott, 1903, p. 242. 



Eucalanus crassus Cleve, 1903, p. 362. 



Eucalanus crassus Cleve, 1904, p. 189. 



Eucalanus crassus Wolfenden, 1904, pp. 111, 112. 



Eucalanus crassus Wolfenden, 1905(0), p. 996. 



Eucalanus crassus Sars, 1905 [o], p. 2. 



Eucalanus crassus Esterly, 1905, p. 134, fig. 8. 



Eucalanus crassus Farran, 1905, p. 30. 



Eucalanus crassus Pearson, 1906, p. 7. 



Eucalanus crassus Farran, 1908, p. 22. 



Eucalanus crassus van Breemen, 1908, p. 16, fig. 13. 



This Eucalanus, which is apparently widely distributed throughout the oceans as shewn 

 by the above references, occurred at the following stations in the area investigated by the 'Siboga'. 



Stat. 16. — Stat. 37. — Stat. 66. — Stat. 75. — Stat. 89. — Stat. 93. — Stat. 98. — 

 Stat. 99. — Stat. 106. - - Stat. 109. — Stat. 118. — Stat. 124. -- Stat. 125 (day). — 

 Stat. 125 (night). - - Stat. 138. -- Stat. 141. — Stat. 142. -- Stat. 143. — Stat. 144. - 

 Stat. 146. — Stat. 148. -- Stat. 165. -- Stat. 169. -- Stat. 172. -- Stat. 184. — Stat. 189'. — 

 Stats. 194—7- — Stat. 204. — Stat. 216. — Stat. 220 (vertical net). — Stat. 252. — 

 Stat. 282. — Stat. 315. 



l 9 



