232 MR. W. P. PYCRAFT ON THE 



carpal rem ex. The overlap is distal. On the forearm the coverts 1-5 are very consider- 

 ably the longest in the row, gradually increasing in length from without inwards. The 

 series terminates at the elbow and is not continued inwards on to the arm. The overlap 

 is proximal. 



On the ventral surface of the manus this row terminates at the base of the 6th remex. 

 The feathers of the cubital series are fairly long and uniform in length, but concealed by 

 the 1st row of the t. minores, which are slightly longer and closely approximated at their 

 bases. 



T. minores. — On the dorsal surface these coverts are wanting on the manus. There 

 are about 3 cubital rows, all with a proximal overlap. With the 1st row, as with the 

 median series, coverts 1-5 are considerably the longest in the row. The same is true of 

 the two succeeding rows, preaxially, but in the case of each row the differences of length 

 decrease rapidly. 



On the ventral surface of the manus they are moderately long, replacing the t. medice 

 after the 6th metacarpal remex. Those of the cubital remiges are slightly longer, and 

 therefore conceal the t. medice. The 2ad row is made up of much smaller feathers than 

 the 1st. It is only represented on the manus by 3 feathers lying at the bases of the 

 metacarpal remiges 1-3. The 3rd row is not repi'esented on the manus. On the forearm 

 it follows the course of tlic ulna. In texture the feathers of this row are small and 

 semiplumous. The patagial membrane is clothed with 2 rows of degenerate semi- 

 plumous contour-feathers. 



T. marginales. — On the dorsal surface there are 2 rows running along the preaxial 

 border of the manus. The greater part of the surface of the patagium is clothed by some 

 4-5 rows, which arc continued inwards along its margin as a closely-set triple row of 

 feathers, which ultimately join the ^9^. humeralis. 



On the ventral surface there are from 2 to 3 rows. The coverts of this scries are seated 

 in closely-packed obliquely transverse rows. The postaxial row, seated on the patagium, 

 are very long, and overlap the semiplumous t. minores. 



Parapteron. — This is made up of some 8 obliquely-transverse rows of 3 feathers in 

 each row. Of these, the middle feather is the longest. The most preaxial feathers at 

 the distal end of the arm rest on the humerus, the remainder on the muscles of the arm. 

 Viewed as a whole, the parapteron is of a rounded conical form. It is connected by a 

 double row of small feathers with the tectrices on the forearm. Whether these feathers 

 can be brought into serial relation with the tectrices majores and medics of the forearm 

 is a point not easy to determine. 



Hypopteron. — Elongated, delicate, semiplumous feathers, running along the under 

 surface of the arm in some 6 transverse rows of 3 feathers in each row, make up the 

 BJijpopteron. Proximally they merge with the recurved end of the median branch of the 

 ■pt. vcntralis. 



Ala spuria. — Four strong feathers take part in the formation of the ala spuria. 



It is a point worthy of remark that the feathers of the dorsal surface of the pt. alaris, 

 instead of being set in quincunx, form obliquely-transverse rows sloping from without 



