18 Si goto: 



"Locality atid Habitaf. This species was very abundant on a sand-flat 

 jiLst exposed at low tide on Po Seuang, Singapore ; I did not meet with 

 any examples elsewhere ; its habitat appears to be identical on the islets of 

 the Java Sea {</. Sluitee). 



" Distribtdion. Extends from tlie Nicobars and Andamans tln'ough the 

 Mergiii Ai'chipelago, Malay Ai'chipelago, and N. Australia, as far as the 

 Fiji and Tonga Is. It saems doubtful whether it occm-s in Mam'itius. 



" Out of five specimens brought back the suj)eromarginals varied in 

 number from 45 to 50 on each side of interbrachial arch (v. M.\etens gives 

 40-50, while MÜLLER and Tkoschel give 36). There were no traces of 

 superomarginal spines. 



" In one specimen at the base of one of the arms there is a constriction 

 somewliat similar to that which occm's in Linchia bafore schizogony of the 

 arm takes place ; in the j)i'esent case the superomaginals meet across the 

 abactinal sm-face, but tlie actinal plates are unaffected. 



" The anus is central, without any tandency towards Cuénot's iutarra- 

 dius BC in any of the five speciriiens brought back : Prof. Ludwig, in his 

 definition of the genus Archaster, says, ' After central ' [loc. cit. p. 667) ; 

 whereas in the body of the Avork (p. 587) he corroborates Cuénot by stating 

 that it lies ' stets melu" oder weniger excentrisch in der Richtung einer inter- 

 radialen Hauptebene,' and he then continues to describe the x^^^i'^icular 

 interradius in agreement with Cuénot' s notation BC, although he adopts a 

 somewliat dijfferent mode of orientation. 



" Measiu'ements of two extreme individuals : — ■ 



No. of marginals. R. r. Arm-breadth. 



46 64 12 13 



46 71 10 13." 



It may be mentioned in passing that the apparent contradiction in 

 Beonn's ' Ivlassen u. Ordn.' referred to by Bedford in the above extract is 

 fully explained by Ludwig (^vide infra). ^ 



Pfeffer simply mentions it from Ternate [: 00, p. 83]. 



It is also described by Ludwig from the Albatross collection of 1899-1900 

 from the South Pacific [: 05, p. 53 and Taf. XXI, fig. 116] : 



