532 Zoological Society. 



passes downwards, and is tied down by the annular ligament j and 

 has the same distribution as in the Locn and Gull, except that the 

 tendon is more closely tied down, smaller, and not so round. An- 

 other muscle arises fleshy from the whole anterior part of the Jibula, 

 interosseous ligament, and part of the external side of the tibia ; it 

 forms its tendon near the ancle-joint, and is attached to the pos- 

 tero-external angle of the metatarsus on its plantar surface. There 

 are also four muscles arising from the metatarsal bone, one on each 

 side, and one in the fosscc between the three portions of the meta- 

 tarsal bone : they all arise near the tibial end on its superior surface, 

 and are attached to the phalanges of the first, second, and fourth 

 fingers. The thumb has three muscles: an extensor, on its superior 

 surface; ajlexor, on its inferior j and an abductor, on its internal 

 surface ; all attached to the tibial end of the metatarsus as usual. 



" The diaphragm consists of twelve narrow fleshy slips, which 

 arise, six on each side, from the internal surface of the ribs : near 

 their angle they pass upwards, and are inserted tendinous into the 

 thin transparent membrane covering the lungs. The blood-vessels 

 pass in front of it. 



" The circulatory system corresponds exactly with that of the 

 Loon, except in the origin and distribution of the arteries of the 

 stomach. The cceliac artery comes oft' on a level with the fifth rib ; 

 it passes a little forwards, and divides into the coronaria ventriculi, 

 the hepatic, and the splenic. The coronaria ventriculi, just after its 

 origin, divides into the superior and inferior coronaries : the superior 

 passes round the large curvature of the stomach, and near the pylo- 

 rus gives off the superior pyloric and left hepatic ; the inferior passes 

 down the right side of the stomach, and disappears at the pylorus, 

 being here minutely ramified upon it. The hepatic gives oft' the 

 right gastro-epiploic, which goes on the inferior angle of the sto- 

 mach, and the right gastric, which goes on the pylorus and superior 

 part of the stomach, anastomosing with the superior pyloric and 

 inferior coronary arteries. The splenic gives off a small artery dis- 

 tributed on the cardiac portion of the stomach, and some vasa 

 hrevia, which are distributed to the left portion of the stomach. 



"Not wishing to mutilate the skeleton, I did not examine the 

 brain 5 but from the number, size, and situation of the foramina in 

 the base, and the whole contour of the cranium, the brain must be 

 presumed to be very nearly similar in proportional quantity and 

 structure to those of the Loon and Gull* 



" The nerves are distributed as usual. The brachial plexus is 

 composed of the last cervical and first two dorsal nerves, and of a 

 filament from the last spinal nerve but one in the cervical region. 

 The sciatic is composed of the five superior or anterior pairs of pel- 

 vic nerves. 



" The nose is organized similarly as in others of this class. The 

 cartilaginous lamincs of the turbinated bone are concentric, and 

 thirteen in number. 



" The eye has six muscles, which arise and are attached as usual. 

 The lachrymal gland is placed at the postero-superior part of the 



