X LIST OF ILLUSTEATIONS 



Facing page 



3. Nest and eggs of finch lark. Catching a spitting cobra. Termite 



workings where a tree frog was found 70 



4. Zanzibar galago, the first animal obtained by Expedition. White- 



bearded gnu after six months in Washington. Soft-shelled tortoise 



from Dodoma ^ 70 



two new species of commensal copepods from the woods 

 Hole region 



By H. R. Seiwell 



1 . A mphiascus commensalis, new species 6 



2. Tisbe wilsoni, new species 6 



The Florida tree snails of the genus Liguus 



By Charles Torrey Simpson 



1-4. Florida tree snails of the genus Liguus 44 



Concerning the origin of the metal in meteorites 



By George P. Merrill 



1-3. Origin of metal in meteorites 8 



Tertiary fossil plants from the Argentine Republic 



By Edward W. Berry 



1-5. Argentine Tertiary plants 28 



TEXT FIGURES 



Two COMMON SPECIES OF PARASITIC CRUSTACEA (SaCCU- 



linidae) of the West Indies 



By H. Boschma 



1. Two specimens of Drepanorchis occidentalis. a, From Mithrax forceps 



(A. Milne-Edwards), the surface lying against the thorax of the 

 host, X 3/4. b, The same specimen, the surface lying against the 

 abdomen of the host, X 3%. c, From Macrocoeloma camptocerum 

 (Stimpson), the surface lying against the thorax of the host, X 3. 

 d, The same specimen, the surface lying against the abdomen of the 

 host, X 3. In these figures the mantle opening is found in the 

 upper part, the stalk in the lower part 



2. Drepanorchis occidentalis from Mithrax forceps (A. Milne-Edwards), 



longitudinal section, X 30 



3. Drepanorchis occidentalis. a, Part of the external cuticle of a specimen 



from Pitho anisodon (von Martens) , X 440. b, Part of the external 

 cuticle of a specimen from Mithrax forceps (A. Milne-Edwards), 

 X 440. c, Retinaculum of a specimen from Macrocoeloma campto- 

 cerum (Stimpson), X 440. d, Internal cuticle with retinacula of 

 a specimen from Microphrys bicornutus (Latreille), X 110. e, 

 Retinaculum of a specimen from Mithrax sculptus Lamarck, X 440. 

 /, Retinaculum of a specimen from Pitho anisodon (von Martens), 

 X 440. g and h, Retinacula of a specimen from Microphrys bicornu- 

 tus (Latreille), X 440 



Page 



