640 Proceedings of the Royal Irish Academy. 



of the flexor digitorum longus I have found absent in two instances. 

 Thrice I have noted the presence of a tendinous slip to the second toe, 

 which was pierced (within the thecal sheath) by the corresponding 

 tendon of the flexor longus digitorum. In a considerable proportion 

 of cases (twenty-two per cent., according to Krause) one or more slips 

 may be traced to the tendons of the lumbricales. 



Tibialis secimdiis (Bahnsen) ; tensor capsulce. tihiotarsalis ; tensor 

 memlrance synovialis tarsi. — This anomalous muscle I have found pre- 

 sent in two cases only. The degree of development was very different 

 in the two. Arising in either instance from the posterior surface of 

 the tibia below the tibialis posticus, the insertion in one case was 

 into the ligamentum lanciniatum; in the other, into the posterior sur- 

 face of the capsule of the ankle-joint. 



Accessorius ad calcaneiim. — This muscular slip has an origin similar 

 to that of the muscle last described. The insertion in one specimen 

 which I examined was into the posterior part of inner surface of 

 calcaneum. 



Pronator pedis. — One example of this muscle has been already 

 published. I have not met with any other. 



Inter osseii^edis. — Of the varieties of the plantar set, I have noted the 

 following : — Four present in one instance, the additional one arising 

 from the outer side of the great toe, and inserted into the corresponding 

 side of the base of its first phalanx ; the first plantar having an acces- 

 sory head from the second metatarsal bone, and a perforating artery 

 passing between the two heads ; the outer plantar having an acces- 

 sory head from the sheath of the canal for the peroufeus longus. 



Of the dorsal set, I have found the fourth arising by a single head 

 in one instance ; the only other peculiarities I have seen were of size 

 and extent of osseous attachment, of which a great variety exists. 



Abductor hallucis. — In three cases I have found a small tendinous 

 slip going to the second toe, and attached to the inner side of the base 

 of its first phalanx. The fi'equency of the presence of this additional 

 band is nine per cent., according to Krause. I once saw a large slip 

 go to the tendon of the flexor hallucis longus, with which it became 

 intimately blended. 



Flexor digitorum brevis. — The tendon for little toe was absent three 

 times in thirty cases, in which this muscle was specially examined. 

 Krause makes the frequency of its absence as much as fifteen per 

 cent., and I have myself seen it in many other cases without making 

 special note of the proportional frequency. In one instance a kind of 

 substitute was present, formed by a tendon coming independently 

 from a fleshy bundle, which was segmented from the lower part of 

 the flexor longus digitorum. 



Abductor minimi digiti. — An accessory head of origin to this 

 muscle from the base of the fifth metatarsal bone I have twice met 

 with. The tendon of insertion may be completely separate from 

 that of the flexor brevis minimi digiti : this I have found in a good 

 many cases. A tendinous slip to the base of the fifth metatarsal bone 



