236 Records of the Indian Museum. [Vol. IX, 1913.] 



Scaipellum polymorphum , Hoek, Sib.-Exp., Mon. XXXIa, 

 p. 80, pi. VII, figs. 9-11 (1907). 



I have now no doubt that all the forms mentioned in the above 

 synonomy represent a single very variable species, the valves of 

 which may be practically complete, or very incomplete indeed, or 

 exhibit various intermediate stages. Some specimens of my 

 S. subflavum are identical with Hoek's figure of his 5. polymorphum 

 form C, while the types of 5. laccadivicum and its variety investi- 

 gatoris are somewhat less complete as regards the valves of the 

 upper whorl than an}' of the specimens obtained by the ' Siboga.' 

 Their capitulum is also broader, but there is considerable variation 

 in this respect, as there is also in the length of the peduncle. My 

 description of the appendages, drawn up at a time at which I had 

 little experience, was incorrect in several particulars They agree 

 well with those described by Hoek, allowance being made for the 

 very considerable individual variation that certainly exists. The 

 rostrum is rudimentary or absent. 



Scaipellum laccadivic2im has been taken by the ' Investigator ' 

 at the following stations : — 



Sat. 297: Gulf of Oman, 25°!!' 30 N., 57°i5' E. ; 689-700 



fathoms. 

 „ 298 : Arabian Sea, 23°48' 3o" N., 58^33' 45" E. ; 337-398 



fathoms. 

 ,, 317: W. of Ceylon, 7°4' N., 79^32' E. ; 590 fathoms 



(Types). 

 ,, 319 : Laccadive Sea, I2°2' N., 73°46' E. ; 1154 fathoms. 

 „ 358: Arabian Sea, i5°55' 3o" N., 52°38' 30" E. ; 585 



fathoms. 



At station 319 only the typical form and the form investigatoris 

 were obtained ; at all the others, and also at an unrecorded point 

 in the Andaman Sea (173 fathoms), only the form subflavmn. The 

 ' Siboga ' specimens were taken off the Kei Is. and off Sumbawa 

 in 397 m. ( = 220 fathoms). 



Type No. ^iio Crust. Ind. Mus. 



