REPORT ON THE SPHENISCTD^. 241 



POSTSCRIPT. 



Since the manuscript of the foregoing pages was placed in the hands of the printer, 

 I have devoted attention to the collection of the eggs and young of the Challenger 

 Penguins, the results of the investigation into the anatomy of which I proposed should 

 form the second part of this memoir. The collection consisted of — 



(a) Ten eggs of Eudyptes chrysocome, from Tristan d'Acunha. 



(b) Two eggs of Pygosceles tceniatus, from the Falkland Islands. 



(c) A quantity of eggs of Eudyptes chrysocome, from Tristan d'Acuuha, containing 



embryos. 

 {d) Fourteen young Penguins from Tristan d'Acunha. 

 ((?) Two young specimens of Eudyptes chrysocome from Kergueleu Island. 



(a) Of the ten eggs of Eudyptes chrysocome, from Tristan d'Acunha, the majority did 

 not appear to have been incubated, but in others the blastoderm was partially developed. 

 In the latter, the pellucid and opaque areas presented a circular form, showing that the 

 eggs had been removed from the nests shortly after incubation had commenced. The 

 state of preservation of these eggs was not such as to warrant any expectation of import- 

 ant embryological results from examinatiou of the blastoderm by means of the microscope, 

 and I did not, therefore, proceed to examine them with the aid of that instrument. 



(6) Both the eggs of Pygosceles tceniatus were so completely decomposed that it was 

 impossible to determine with accuracy anything regarding their mode of development. 



(c) AU the eggs of Eudyptes chrysocome, from Tristan d'Acunha, which contained 

 young birds were in an excellent state of preservation. The contained embryos were all 

 of large size, indeed they appeared to be for the most part mature and ready to make 

 their escape from the egg. In a few, however, the yolk sac had not yet been wdthdrawu 

 into the cavity of the abdomen. 



{d) and (e) The fourteen young Penguins from Tristan d'Acunha, and two young 

 specimens of Eudyptes ch7'ysoGome from Kerguelen, were all small birds which had 

 apparently only recently escaped from, or in some cases had been removed from, the egg 

 at or about full time. 



(ZOOL. CHALL. EXP. — PART XVIII. 1883.) S 30* 



