ALCJE 



361 



the extensors of the fore arm to be inserted on to the ulna ; 

 the anterior of these bifurcates in the HmicoHne fashion 

 just in front of its insertion, and here a very faintly marked 

 fan ^ (Fubbeingeb) connects it with the longus. 



Synthliborhamphus antiquus is in some respects even 

 more simple.^ 



There is but one brevis tendon, from which — just as it 

 passes over the extensor of the fore arm — the merest apology 

 for a forward branch exists ; 

 from this branch arises a 

 special muscular belly of 

 the extensor metacarpi (cf. 

 Petrels). There is no 

 patagial fan, but a special 

 slip, found in all the other 

 members of the family (and 

 also occurring in Larus 

 argentatus) , runs from the 

 longus tendon to the op- 

 posite side of the fore arm 

 to that upon which the 

 patagial fan, when present, 

 is inserted. 



In Brachyrhamphus 

 marmoratus three separate 

 and parallel tendons arise 

 from tensor patagii brevis muscle, of which the anterior is 

 the strongest and alone passes to the ulna. From a small 

 wristward slip arise a few fibres of the extensor metacarpi, as 

 in the last species. There is no patagial fan, but an ulnar slip, 

 which gives off a branch running back to the humerus. In 

 Uria columba there is the same. 



In Lunda cirrhata there are but slight differences ; the 

 two most anterior of the brevis tendons cross the extensor 



Fio. 175. — Tensobes Patagii of Cerato- 

 rhina monocerata (ArTER Beddaed fkom 

 Forbes). 



' Not figured at all by Garkod in a MS. sketch. 



' For various details in anatomy of soft parts see Beddakd, ' On the Anatomy 

 of a Grebe (Mchmophorus major), with Remarks upon the Classification of 

 some of the Schizognathous Birds,' P. Z. S. 1896, p. 538. 



