158 DR. P. CHALMERS MITCHELL ON THE | May 16, 
almost atrophied in the more specialised types of gut-pattern— 
as, for instance, in Hydrophasianus (text-fig, 25, C.). 
With regard to these two features of their structure, the con- 
ditions of which in Birds generally are pretty well known, the 
position of the Limicole is easy to define. In wing-structure they 
are diastataxic, like all but the most specialised Columbe, and like 
many of the Gruiformes. In the gut-pattern they are not much 
modified from the archecentric condition, but the modification is 
definite, characteristic, and progressive, and, in its simpler form, 
Text-fig. 25. 
o 
a: 
Diagram of intestinal pattern of Hydrophasianus chirurgus. 
Lettering as in text-fig. 24. 
similar to that shown by the Gruiformes. In the more specialised 
types the elongation and spiral twisting of a portion of Meckel’s 
diverticulum brings about a superficial resemblance with the 
arrangement in the long-gutted Columb and Passeres, but the 
morphological condition is different, as a different portion of 
the intestinal tract is affected. I shall now endeavour to set 
out the chief modifications in muscular anatomy that I have found 
to be of interest in these birds. 
MuscuLar ANATOMY. 
Latissimus dorsi anterior et posterior.—The anterior division in all 
these birds is a broad flat muscular strap, without any peculiarities. 
