1884.] 



MR. G. E. DOBSON ON CAPROMYS MELANURUS. 



243 



Gracilis (fig. 3, g) closely resembles the corresponding muscle 

 in Erethizon dorsutus '. As in that species it arises in two distinct 

 parts : — the upper, from the ilio-pectineal ridge and symphysis pubis, 

 divides at a sliort distance from its origin into two parts ; these unite 

 near their insertion by their flat tendon and are inserted into the 

 tendon of the quadriceps extensor cruris, into the internal edge of the 

 patella, and into the head and tuberosity of the tibia; the lower part(y') 

 is narrower, but thicker, arising from the symphysis pubis and from 

 the ramus of the pubis and ischium as far as the edge of the semi- 

 membranosus muscle, and is inserted into the shaft of the tibia above 

 and slightly overlapping the insertion of the semitendinosus, being 



" 



Dissection, half natural size, of the muscles on Ibe anterior aspect of the thigh 



and leg described in the text, 

 a.r. Anterior crural nerve; f. Internal condyle of femur ;f.a. Femoral artery; 



i.l.l. Infernal lateral ligament; h. Ramus of pubis and ischium' 



pb. Symphysis pubis. 



connected by a tendinous aponeurosis with the lower edge of the 

 upper part. 



Adductor longus (fig. 3, a. I) is small, arising from the bony 

 margin of the pelvis under cover of the middle third of the upper 

 part of the gracilis at its origin, and, passing forwards parallel to 

 and partially covered by the pectineus, is inserted into the shaft of 

 the femur directly under the insertion of that muscle. 



1 See Mirart, ■Anatomy of Erethizon dorsafi's," P. Z. S. 1882, p. 1>S4. 



