260 nn. p. l. sclater on a new galljnula. [June 11, 



Gyri (of the inner face) : 



17. Marginal (pli de la zone externe). 



18. Callosal (circonvolution de I'ourlet, Foville) (pli du corps calleux). 

 18'. Quadrate lobule (lobule quadrilatere, Foville). 



19. Uncinate (circonvolution a crochet, V. d'Azyr) (lobule de I'hip- 



pocampe). 



20. Dentate (corps godronne). 



21 — 24. Internal annectent (plis de passage internes). 

 25. Internal occipital lobule (lobule occipital). 

 Sulci (of the outer face) : 

 a. Infero-frontal. 

 t. Supero-frontal. 



c. Antero-parietal. 



d. Postero-parietal (scissure de Rolando, Leuret). 



e. Sylvian. 



/. Antero-temporal (scissure parallele). 



g. Postero-temporal. 



h. Temporo-occipital (scissure perpendiculaire externe). 



Sulci (of the inner face) : 



i. Calloso -marginal (grand sillon du lobe fronto-parietal). 



k. Occipito-parietal (scissure perpendiculaire interne). 



/. Calcarine (posterior part of the scissure des bippocampes). 



m. Dentate. 



n. Collateral. 

 ca, cd, cp, anterior, descending, and posterior cornua of the lateral ven- 

 tricles. 

 • hippocampus minor ; ** hippocampus major, 

 ec, eminentia coUateralis , or its continuation. 



[The synonyms given above are taken from the work of M. Gra- 

 tiolet when no other anatomist's name is attached to them.] 



8. On the Island-hen of Tristan d'Acunha. By Philip 

 LuTLEY Sclater, M.A., Ph.D., F.R.S., Secretary to the 

 Society. 



(Plate XXX.) 



The fact of the existence of a bird of the family RaUidce, with im- 

 perfectly developed wings, in the Island of Tristan d'Acunha has 

 already been recorded by more than one writer*. One of the objects 

 most interesting to naturalists in the fine collection of living animals 

 lately received by the Society from His Excellency Sir George Grey, 

 to which I especially called the attention of the Society at their last 

 meeting f, was a single example of this bird — the first of its kind 

 that has reached Europe alive or dead. It appears to belong to a new 

 species of the genus Gallinula, closely allied in general aspect to our 

 Common Water-hen (G. chloropiis), though readily distinguishable 

 on accurate comparison. 



Five living examples of this bird were brought from the Island of 

 Tristan d'Acunha to Cape Town by a person formerly in the service of 

 Sir George Grey. Two of them were accidentally killed at Cape Town, 

 but their skins, except the heads, were preserved by Mr. Benstead 



» See Mr. J. H. Gurney in Zoologist, p. 4017 (1853), and Capt. Carmichael in 

 Linnean Trans, ■xii. p. 496. 

 t See anfcn, pp. 208, 209. 



