156 DR. P, CHALMERS MITCHELL ON THE © | May 16, 
quill than to the most distal secondar -quill in most Limicole, 
but the position varies, and that shown in the diagram is more 
primitive. As evidence of their association with the secondary 
series, there is to be taken into account first the fact that the 
covert crosses the remex as in the secondary rows, not lying distal 
to it as in the primaries, and, secondly, that a plica (pl.), to 
which I have called attention in other groups (4 and 5), unites the 
carpal remex with the most distal secondary remex. 
Text-fig. 23. 
A 
S 
Wing-structure of Chionis alba. 
V/-c. R 
C.C. 
Diagram of the distal secondary quills and coverts, 
showing the diastataxic arrangement. 
S. First secondary. P. First primary. «. Diastataxic gap. C.R. Carpal remex. 
C.C. Carpal covert. PI. Plica, binding carpal covert to first secondary. 
The condition of the wing in the Limicole is similar to that 
found in the greater number of the Columbe, but whereas in some 
Columbee (4) the eutaxic condition is found—or, as I have tried 
to show, has been attained,—it has not been attained by any of 
the Limicole, In the Gruiformes: a somewhat incoherent group 
certainly closely related to the Charadriiformes, both conditions 
of the wing are present (7). 
GUT-PATTERNS IN THE LIMICcOLa. 
T have already shown (6) that the pattern of the gut in Limicole 
is of considerable interest. It displays a configuration which 
differs from the pattern which is archecentrice for all birds in a 
fashion similar to the divergence shown by the Gruiform birds, 
