442 MR. W. A. FORBES ON THE [MaV 16, 



Fig. 13. Wixia ahdominalis, ep. n. 



a, Spider in profile, enlarged ; h, cephalothorax of ditto in profile ; 

 c, caput and eyes, from in front ; d, abdomen, from behind ; e, maxillae 

 and labium ; /, natural length of abdomen to extremity of protuber- 

 ance ; g, natural length of Spider (from base of falces to just above 

 the spinners). 

 14. Mago intetita, sp. n. 



a. Spider enlarged ; b, ditto in profile ; c, left palpus ; d, ditto, from 

 outer side ; e, natural length of Spider. 



2. Note on an Abnormal Specimen of Pithecia satanas. 

 Bj W. A. Forbes, B.A., Prosector to the Society. 



[Eeeeired April 18, 1882.] 



A young male specimen of Pithecia satanas, which v/as lately for- 

 warded to the Society's Gardens, and died shortly after its arrival, pre- 

 sented an abnormal condition that is perhaps worth recording in 

 the Society's ' Proceedings.' 



The peculiarity consists in theconi))letely "webbed" condition of 

 the third and fourth digits of the manus on each side, these two 

 fingers being completely connected together down to their tijis by a 

 fold of nude skin, and with their nails closely apposed, though not 

 connected, along their contiguous margins. The other digits of the 

 hands, as well as all of those of the feet, are quite normal, the 

 webbing of them not extending beyond the middle of the first 

 phalanx. 



The case is interesting, partly as affording an excellent instance of 

 an abnormal condition affecting homologous parts of opposite sides 

 in an exactly similar way, and partly as showing that the lower 

 Primates are subject, occasionally, to a condition of things which, as 

 is well known, also occurs not at all rarely in Man. 



3. Ou some Points in the Anatomy of the Todies (Todida;), 

 and on the Affinities of that Group. By W. A. Forbes, 

 B.A.J Prosector to the Society. 



[Eeceived May 16, 1882.] 



One of the few important forms of birds that the late Prof. 

 Garrod had not an opportunity, at some time or other, of dissecting 

 was the genus Todus, the sole representative of the family Todidae. 

 I was therefore much gratified at being able to examine, some months 

 ago, a spirit-specimen of Todus viridin, which was placed at my dis- 

 posal for dissection by Prof. Newton with his accustomed liberality ; 

 but I hesitated to publish my notes without having further material 

 to contirm my observations. An opj)ortunity of doing this lias 

 lately been afforded to me by the kindness of Prof. Baird and the 

 authorities of the Smithsonian Institution in Washington, who for- 



