54 Proceedings of the Royal Irish Academy- 



neal tubercle ; its insertion overlies that of peetineus. Quadratus 

 femoris ('04) arises as usual from the tuber ischii anterior to 

 the origin of biceps, and is inserted into the intertrochanteric line. 

 Obturator externus ('07) and internus ("05) are both present and 

 separate in all ; the superior gemellus is large in N. narioa, but the 

 inferior is absent ; both are present and distinct in N. fusca, and they 

 are fused with obturator in Martes. 



Agitator caudae (-06) in N. narioa arises from the first caudal ver- 

 tebra, and is inserted into the lower two-thirds of the outside of the 

 femur ; it is represented by the caudal origin of the biceps in Martes. 

 Pyriformis ("05) arises from the third and fourth sacral vertebrae, 

 and is inserted as usual just behind the tendon of the gluteus medius. 

 Gluteus maximus ("07) arises from the gluteal fascia and first cau- 

 dal vertebra (and from the side of the sacrum as well in Martes), and 

 is inserted into the great trochanter, and more especially into its pro- 

 minent lower part in the coatis. Gluteus medius ("IS) is large and 

 normal. Gluteus minimus (+ gluteus quartus "03) is fused with gluteus 

 quartus in IS. narica, though separate from it inN. fusca ; the latter is 

 absent in the martins. Tensor vaginae femoris ('05) is small and normal 

 in N. narioa, arises from the anterior superior spine of the ilium in N, 

 fusca, and from the inferior edge of that bone in Martes, and is inserted 

 into the fascia of the thigh as usual ; it is scarcely separable from gluteus 

 maximus. 



Biceps femoris {'11) arises in ]S"asua from the tuber ischii, and in 

 Martes from the first and second caudal vertebrae as well, and is inserted 

 in N. narioa into the upper two-thirds of the leg; in N. fusca into the 

 upper half, and in the martin into the fascia of the thigh and upper 

 half of the tibia. Biceps accessorius ('02) arises along with agitator 

 caudse, and is inserted along with biceps in N. narioa ; it arises along 

 with the caudal head of semitendinosus, and is inserted into the middle 

 of the fibula in N. fusca ; it was not distinct from biceps in the martin. 

 Semimembranosus ("1 1) in the coatis is united to adductor primus 

 except at its insertion, which is tibial as usual ; in Martes it is quite 

 separate, extending from the tuber ischii to the top of the tibia. 

 Semitendinosus (*11) arises in Nasua by two heads — one from the 

 tuber ischii as usual, and the other tendinous from the first caudal 

 Vertebra ; they unite at the inscription, which is about halfway down 

 the muscle, and are inserted as usual into the tibia close to sartorius. 

 There is only the single ischial head in Martes, and the insertion is 

 into the tibia at the point of junction of the upper and middle thirds. 

 Gracilis has a wide origin from nearly the whole of the horizontal 

 ramus of the pubis, and is inserted into the tibia, inseparably from 

 sartorius in N. narica, but distinct from, although closely applied to, it 

 in N. fusca. 



Eectus femoris ("lO) has one head, and is moderately separate from 

 vastus externus ('14), which is normal and distinct from vastus inter- 

 nus (-1- crurseus 'Oe), the latter being inseparable from crurseus. Qua- 

 driceps extensor cruris pl'esents no feature of importance in Martes, all 



