ON THE COURTSHIP OF THE REDSHANK. 647 



baclj it is fed from the left ovarian artery, it is necessary to divide tlie 

 Pat-body between the two gonads. Thus it comes that the anterior part 

 of the Fat-body is represented on the right side of the animal and the 

 posterior part on the left. As the Anterior Abdominal Vein runs in the 

 Fat-body it is also divided and is so represented in the diagram, in which 

 its two ends are joined by a dotted line. 



Plate LXXI. 

 Diagrams of the Blood-vessels in the head of Tropidonotus natrix. 



Fig. 3. Diagram of the Cranial Arteries seen on the ventral surface of the brain. 



The brain is represented as removed from the skull leaving behind, 



however, the Pituitary Bodj'. 

 Fig. 4. Diagram of the arteries of the head seen from the dorsal side. The brain is 



removed, but some of the cranial arteries are left behind. The positions of 



the glands of the head are indicated by shaded areas. 



PiATE LXXII. 



F'ig. 5. Diagram of the vessels on the ventral side of the lower jaw after the removal 

 of the superficial muscles. 



Fig. 6. Diagram of the Veins and Sinuses in the head seen from the dorsal side. 

 The deeper vessels are represented in lighter shading and with a dotted 

 outline. The position of the brain is indicated in simple outline, while the 

 positions of the glands are indicated by shaded areas. For the purposes of 

 diagram the Superior Palpebral Vein is omitted. It runs from the nppev 

 anterior part ot the Orbital Sinus above the Maxillarj' Vein and joins the 

 Inferior Palpebral Vein as the latter enters the Orljital Sinus. In dis- 

 secting out the vessels of the orbit it is almost alvvaj's removed with the 

 upper eyelid. 



34. A First Account o£ the Courtship of the Eedshank 

 ( Totamis calidris L.). By Julian S. Huxley, Lecturer 

 of Balliol College, Oxford. 



[Received February 2, 1912 : Read April 23, 1912.] 



Index. 



Pag3 



1. Introduction 647 



2. Locality 648 



3. The Courtship proper 649 



4. Other habits of the Pairing-Season : 



(a) The Love-flight 651 



(6) The Combats of the Males 653 



(c) Calling from a conspicuous perch 652 



5. Discussion 653 



1. Introduction. 



While staying last spring in a lonely corner of North Wales 

 it was my good fortune to come across a number of rare and 

 interesting birds. But great as was the pleasure of seeing, for 

 the first time, such comparatively uncommon species as the Grey 

 Plover and Black-tailed Godwit, it was far surpassed by that of 

 being able to study, under the most favourable conditions, the 

 natural behavioiu- and home life of some of the commoner shore- 

 birds. Of these I was particularly fortunate with the Redshank, 



