JAPANESE ASTEROIDEA. 



ket til denue Ögrupi)e ; ogsaa hu 

 Billitou liar Hi". v. Hedemann 

 lijemseudt den i betydelig Autal. 

 Den er imidlertid ikke forskjellig fra 

 A. typiciis M. T. De Forskjellig- 

 heder, som man kan faae freni ved 

 at sammenhokle MöBius's Beskrivelse 

 med den i ' System der Asteriden', 

 tm'de indskrœnke sig til folgende to 

 Pmikter : 1) at Behns Exemplar er 

 forlioldsvis mere langarmet, en 

 natm-lig Folge af at det er större 

 (seldere) (R=81 mm). 2) At det liar 

 3 ydre Fodpapiller istedenfor 2, af 

 hvilke den ene lios A. typicus endda 

 of te skal erstattes'^ af en Pedicellarie ; 

 det er nu ganske rigtigt, at det 

 normale Tal er 3, af livilke den ene 

 dog, is8er hos större Exemplarer, ofte 

 erstattes af en tvegrenet Tang, livis 

 Forekomst ikke omtales lios MÖBius; 

 men paa den anden Side finder man 

 virkelig liist og her knn 2, saa at 

 Müllers og Teoschels Beskrivelse i 

 dette Punkt vel er nfuldstœndig, men 

 ikke aldeles urigtig. — At Madrepor- 

 pladen i det ene Vserk siges at ligge 

 *noget nsermere ved Centrum end 

 ved Armvinklen,' i det anden 

 trent midt imellum 

 Händen,' har maaskee ikke engang 

 til Hensigt at antyde en faktisk 

 Forsk jellighed . 



" Da Alien uden Vanskelighed 

 vil erkjendes af begge de citerede 

 Skiifter, vil det ikke vgere nödventigt 

 her at levere en ny Beskrivelse af 



om- 



Centrimi og 



group of islands in its occm-renee ; 

 Hi\ V. Hedemann has also brought 

 it back in considerable numbers from 

 Billiton. It is not however different 

 from A. typicus M. T. The dif- 

 ferences, which one can obtain by 

 comparing MÖBros' descrix^tion with 

 that in the ' System der Ästenden," 

 may be reduced to the following 

 two points : 1) that Behn's example 

 is relatively longer armed, a natui-al 

 result of its larger size (older) (R = 

 81 mm). 2) That it has 3 outer foot- 

 papillae instead of two, of wliich 

 however one is said to be often 

 replaced by a pedicellaria in A. 

 typicus ; now it is quite correct, 

 that the normal number is 3, of 

 wliich one is, especially in larger 

 examples, rex^laced by a bifiu'cated for- 

 cep, whose occiuTence is not mention- 

 ed by MöBros ; but on the other 

 hand, one finds here and there only 

 2, so that MÜLLER and Teoschel's 

 description is indeed incomplete on 

 this j)oint, but not entirely Avrong. — 

 That the madreporic plate is stated 

 in the one work to lie ' somewhat 

 nearer to the centre than to the arm 

 angle,' in the other ' nearly midway 

 between the centre and the margin,' 

 is not perhaps to be taken as indicat- 

 ing an actual difference. 



" Siuca the species will be re- 

 cognised without difficulty from both 

 of the writings cited, it will not be 

 necessary to furnish here a new 



1) There is a misprint here in the original. 



