1896.] ANATOMY OF ECIIMOPHORUS MAJOR. 541 
from the works of Garrod’, Fiirbringer*, and Gadow®*, and from my 
own dissection of J odicipes cristatus. These observations only refer 
to various species of Podicipes (P. cornutus, P. cristatus, P. minor, 
P. nove hollandie), The differences between these forms and 
Aichmophorus are not great. The tendons of the tensor brevis 
are, however, a little different, judging from the figure which 
Fiirbringer (loc. cit. pl. xix. fig. 4) gives of Podicipes cornutus. In 
that Grebe the tendon of the brevis and the recurrent tendon, the 
longus, appear to form a continuous sheet of tendon covering a 
good deal of the patagium. In P. eristatus the biceps slip joins 
the brevis tendon. The biceps is two-headed in some other Grebes, 
but single in P. cristatus. The evxpansor secundariorum is not entirely 
absent in other Grebes, but is rudimentary. I did not look for it 
with a microscope in Achmophorus, so there may be a faint 
rudiment. I could not find one, however, in P. cristatus. 
The syrinx of Achmophorus (fig. 1) has a very incomplete 
bronchidesmus, a very wide space between the two bronchi existing 
above its anterior edge. The last two tracheal rings are fused to 
form a long box, into the composition of which it appears to me 
that the first bronchial semiring enters. In any case, if that be not 
Wy 
| = ft iN 
| HY 
Fig. 1.—Syrinx of ehmophorus: 7, intrinsic muscles. 
Fig. 2.—Syrinx of Tachybaptes: 7, intrinsic muscles. 
so, the first bronchial semiring has the unusual relations shown in 
the drawing, which are perfectly consistent with the belief that the 
ring is the second bronchial. The intrinsic muscles are attached to 
the third tracheal ring in front of the tracheo-bronchial box. The 
1 Collected papers passim. 
one Untersuchungen zur Morph, u. Syst. der Vogel.’ 
3 “Aves” in Bronn’s ‘ Thier-Reich,’ 
