ATLANTIC AND CARIBBEAN PYCNOGONIDA—HEDGPETH 169 
apparent relationship to A. insignis from Brazil was a point in favor 
of the theory of drifting continents, as he supposed the two species 
had become differentiated since the formation of the Atlantic Ocean.? 
millimetres 
Ficure 8.—The fauna of a sargassum bladder, including Tanystylum orbiculare Wilson. 
As Marcus (1940b, p. 60) has remarked, the evidence that pycnogonids 
are in some instances subject to passive distribution makes such bold 
speculations unwarranted. Now that A. polignaci has been found on 
both sides of the Atlantic (together with several other species) 
Bouvier’s theorizing is untenable. Furthermore, A. polignaci is 
apparently not so closely related to A. insignis as Bouvier supposed; 
while A. insignis is a very variable species, none of its variations 
indicate a close connection between the two species. 
’ For arguments against Wegener’s theory of recent continental drift, see James Johnstone, ‘‘A Study of 
the Oceuns,”’ pp. 212-213, 1930, and R. W. Chaney, ‘‘Bearing of Forests on the Theory of Continental Drift,’’ 
Sci. Monthly, Dec. 1940, pp. 489-499, 
