CARBO MAJOR (FORBES). _Phalacrocorax novaezealandiae var. major_ Forbes, Trans. N.Z. Inst. XXIV, p. 189 (1892--no proper description). Dr. Forbes only informed us that this shag was of greater dimensions than _Ph. novaezealandiae_ (a very closely allied form of _Ph. carbo_). It would be interesting to know more about it, and, especially, if this extinct form was incapable of flight, like _Ph. harrisi_ of the Galápagos Islands. Habitat: New Zealand. {89} PLOTUS NANUS NEWT. & GAD. _Plotus nanus_ Newton and Gadow, Trans. Zool. Soc. XIII p. 288, pl. XXXIV figs 1-5. (1893). The humerus, the pelvis with sacrum, and the tibia were the materials on which our authors founded this new species. They state that all the strongly developed characters in these bones leave no possible doubt as to its being a species of _Plotus_, and its diminutive size at once distinguishes it from the three known species--_P. anhinga_, _P. melanogaster_, and _P. novaehollandiae_. The measurements are as follows:-- Left humerus, length 89 mm. Left tibia, length 61 " Distance from acetabular axis to anterior end of sacrum 30 mm. Distance between ventral inner margins of the acetabula 14.5 mm. Habitat: Mauritius. (Also recorded from Madagascar.) {91} "CHENOPIS SUMNERENSIS" FORBES. _Chenopis sumnerensis_ Forbes, Trans. N.Z. Inst. XXIV, p. 188 (1892) (Nomen nudum). This appears to have been a very large species, with not very great powers of flight, if not flightless. Habitat: New Zealand and Chatham Islands. Bones from Chatham Islands in my collection. {93} CHENALOPEX SIRABENSIS ANDREWS. _Chenalopex sirabensis_ Andrews, Ibis 1897, p. 355, pl. IX, figs. 1-3. This species of which skull, sternum, pelvis, the bones of fore and hind limbs, &c., are preserved, appears to be closely allied to _Chenalopex aegyptiacus_, but has such a number of small differences that Mr. Andrews is, I think, quite justified in separating it; I do not, however, agree with him when he suggests that perhaps it is the same as Newton and Gadow's _Sarcidiornis mauritianus_, although many of the bones agree. Of course, his line of comparison was strengthened by the fact of subfossil bones of _Plotus nanus_ occurring both in Mauritius and Madagascar; but it does not follow that because in one family of birds the same species occurred in two places the others must do likewise, and, therefore, one must not necessarily regard a certain similarity of osteological characters as proof of identity. I must here again refer my readers to Mr. Andrews' very full description. Habitat: Sirabé in C. Madagascar. The measurements are:--