Miscellaneous. 385 



A. obtusissima, and A. neglecta of Jeffrey Bell. A. antarctica, 

 Liitk,, A. rugispina, S. Simpson, A. spirabilis, Bell, Anasterias 

 minuta, Perrier, Asteroderma papillosa, Perr., may also be only terms 

 of one and the same series ; but even assuming that these reductions 

 may become definitive, the number of forms too different to receive 

 the same name is still remarkably large. 



The correspondence between the arctic and antarctic faunas indi- 

 cated by various authors is striking in the starfishes, as is shown by 

 the two following lists, in which the corresponding species of each 

 region bear the same number : — 



NoRTUERN Species. — 1. Br'isinga coronata, 0. Sars ; 2. Pedicel- 

 laster typicus, Sars ; 3. Stichasfer roseus, 0. F. Miill. ; 4. Crihrella 

 oculata, Linck ; 5. LopJiaster furcifer, Diib. & Kor. ; 6. Crossaster 

 pajyposus, Fab. ; 7. Pentagonaster granidaris, 0, F. Miill. ; 8. Hip- 

 jjcisteria plana, Linck ; 9. Porania pidvillus, O. F. Miill. ; 10. 

 Goniopecten CJiristi, Diib. & Kor. : 11. Ctenodiscus corniculatus, 

 Linck ; 12. Pteraster mUitaris, Miill. & Troschel. 



Southern Species : — 1. Labidiaste)' 7'adiosiis, LoYen; 2. P. scaber, 

 Smith ; 3. S. auriantiacus, Meyer ; 4. C. Pagenstecheri, Studer, C. 

 Hyadesi, E. Perrier, and C. Studeri, E. P. ; 5. L, Levinseni, E. P. ; 

 6. C. australis, E. P. ; 7. P. austro-gramdaris, E. P. ; 8. H. mac/el- 

 lanica, E. P. : 9. P. antarctica, Smith ; 10. G. Flenriaisi, E. P. ; 

 11. C. australis, Liitk.; 12. P. Ingousi, E. P., and P. inermis, 

 E. P. 



The naturalists of the ' Challenger ' have noted the frequency of 

 incubatory animal forms in the southern regions. I have ascer- 

 tained this remarkable habit in Diplasterlas Lutkeni, E. P., D. Stein- 

 eni, Studer, and Aster las spirahilis. Bell. In these species the 

 young are attached to the buccal membrane and to the stomachal 

 membrane turned back by the mother by an inferradial ventral 

 peduncle, which corresponds to the preoral lobe of the larva (brachi- 

 olar arms of Asterias and Cribrella, larval organ of Asterlna), a lobe 

 at the expense of which, according to Barrois, the median dorsal 

 peduncle of the Crinoids is also developed. I have made known the 

 organization of the young of Asterias spirabilis in a preceding note, 

 all the statements in which I maintain, notwithstanding the con- 

 trary assertions of M. Cueuot, which have been advanced without 

 any examination of the type spoken of by me. 



Lcdndlaster i^adiosus has presented a phenomenon hitherto abso- 

 lutely unknown in the Echinodermata — the normal formation of new 

 arms adding themselves to the old ones after the completion of the 

 larval period. These new arms bud forth upon the margin of the 

 disk, behind the dentary pieces of the arms, between which they are 

 intercalated in such a way that their ambulacral groove does not 

 reach the buccal membrane ; they are distinguished by other very 

 precise characters from broken arms in course of regeneration. Six 

 of the fourteen specimens of L. radlosus that I have examined 

 presented from one to six arms in course of development ; the num- 

 ber of completely formed arms varied in those individuals from 



