2ÓI 



Copilia mirabilis appears to be widely distributed in die warm rcgions of all the 



great oceans. 



2. Copilia quadrata Dana. 



Copilia quadrata Dana, 1849, pp. 8 — 61. 



Copilia quadrata Dana, [852, p. 1232, pi. 86. 



Copilia quadrata Giesbrecht, 1893, p. 647, pis. 2 & 50. 



Copilia quadrata T. Scott, 1893, p. 113. 



Copilia quadrata I. C. Thompson, 1900, p. 289. 



This species although widely distributed in the Malay Archipelago, proved to be much 

 scarcer than Copilia mirabilis. It was present in the plankton collected at the following stations. 



Stat. 16. — Stat. 37. — Stat. 66. - - Stat. 89. — Stat. 93. -- Stat. 98. -- Stat. \\y\ - 

 Stat. 128 (HENSEN vertical net, 700 metres to surface). — Stat. 129. — ■ Stat. 136. -- Stat. 

 144. — Stat. 146. — • Stat. 157. — Stat. 165. — Stat. 169. — Stat. 172. — Stat. 184. - 

 Stat. 185 (HENSEN vertical net, 1536 metres to surface). — Stat. 203 (HENSEN vertical 

 net, 1500 metres to surface). — Stat. 220 (HENSEN vertical net, 200 metres to surface). — 

 Stat. 220 (surface). — Stat. 230. — Stat. 252. — Stat. 276 (HENSEN vertical net, 750 

 metres to surface). — Stat. 282. — Stat. 315. 



The cephalic segment of the female is very wide. It is nearly quadrangular in outline. 

 The furcal joints are four times longer than the anal segment. 



Copilia quadrata has been recorded from the Atlantic, Indian and Pacific Oceans, and 

 from the Mediterranean. 



3. Copilia vitrea (Haeckel). 



Hyalophyllum vitreum Haeckel, 1864, p. 63, pi. 1. 

 Copilia vitrea Giesbrecht, 1893, p. 647, pis. 2 & 50. 



One female apparently identical with the above species was found in the plankton 

 collected with the Hensen vertical net at Station 220, from a depth of 200 metres to the surface. 



The cephalic segment is rather irregular in shape. It is moderately narrow in front 

 and is somewhat expanded behind. The furcal joints are five times longer than the anal segment. 



This Copilia has been recorded from the Atlantic and Pacific Oceans, and from the 

 Mediterranean. 



44. Family Lichomolgidae. 

 Genus Pachysoma Claus, 1863. 



The members of this genus can be recognised by the broad pyriform body with its 

 distinctly pointed forehead, by the pointed fourth thoracic segment, and by the short abdomen. 

 The antennules are seven to eight-jointed. The exopodites and endopodites of the four pairs 

 of swimming feet are three-jointed. 



One species was represented in the plankton collected by the 'Siboga'. 



261 



