104 MR. W. H. FLOWER ON THE OSTEOLOGY OF 
tions of such attachments, though it is possible that the cartilaginous hinder margin 
may have been connected with another pair. 
In Platanista, according to Eschricht, four pairs of ribs are attached directly by their 
cartilages to the sternum, and the form of this bone has nothing in common with that 
of Inia. The manubrium is flat and triangular, very broad in front, with a straight 
anterior edge, and without either of the processes so prominent in Jnéa. This is 
succeeded by a distinct body, ossified from two lateral centres, and a xiphoid process 
wholly cartilaginous in the young specimen described. Many of the true Dolphins have 
two conspicuous pairs of processes on the manubrium sterni, evidently for the attach- 
ment of muscles—one projecting forwards and outwards, in front of and within the sur- 
face for the attachment of the first pair of sternal ribs, the other rising from the lateral 
border between the surfaces for the articulation of the first and second sternal ribs, and 
directed somewhat backwards. These are especially developed in Monodon. It is to 
these that the processes of the sternum of Jnia appear to correspond, though much 
modified in direction. The sternum of Phocena entirely wants these processes ; 
otherwise it presents some resemblance to that of Znéa in its breadth, flatness, and in 
consisting of a single piece. 
The pectoral limbs of Inia are described by d’Orbigny as “larges, longues, et 
obtuses ;” and the present skeleton fully corroborates this account. 
The scapula (Plate XXV. fig. 3) does not present that singularly aberrant character 
which is one of the most peculiar features of the skeleton of Platanista, but conforms 
more to the ordinary type of the Dolphin-family. Its superior costa is long, and with 
a tolerably regular arch; the anterior and posterior coste (of which the former is 
slightly the longer) are much hollowed out, so that the lower half of the bone is 
narrower from side to side than in most Dolphins. Both the acromion process and 
coracoid are very long, flat, and expanding and truncated at their extremities. The 
glenoid fossa is large. 
The principal dimensions are :— 
Extreme height, from glenoid fossa to middle of superior | 
COSTA veceecceceeecec cee eneecceeereeeeeneseesseeneeesseneee senenees 
Extreme breadth 9.05. 4250... tesiesedal-dine= swash chaensslan sian ebnees 4-8 
Breadth of body at root of acromion process .........+-+2++++ 1-2 
Length of acromion ...........cessseeeeeeeeeatecnneseeeeueesneesnes Ant 
Length of coracoid process .........:.ccsseeeseeeeeseeseenerte eens 1:3 
Length of glenoid fossa ...........:ceseeseeeneecaeeseeeeseeenees 1:2 
Breadth of glenoid fossa .........:+::0sceeeeseeseeeeeeeeeeeeea eens 0-9 
{ie humerus is unusually long in proportion to the other segments of the limb, and 
very simple in its character. he tuberosity is very small; but it is probably not com- 
pletely ossified. The neck is but slightly marked. The distal end of the bone is 
