\ 01 NORTH I'm mi \m« \I>J U LSI WA1 



\:1 IM \> I I III >s till »l III 11 l K .- Mm 



III 



Berkeley Sound, Falkland Islands, 25 t<> 30 met 



Q< ma DIPLASTEBIAS Perrl« 



l> I 



- '1. ;. 77 



i '..II . \.ii ;. Erroi 



/' 1 I ■ ;. pp In7 



Prini • I ■ M !■ i B96 

 n.T 1891, p 160 Plain i v a . 

 I 



/'»■' ^dambulacral plates diplcanathid, withoul attached pedicellariae; 



abaetina] skeleton irregularly reticulate; tli« ¥ plates with on< il slender sp 



Burrounded by ■ collar <>f pedicellariae and more or less heavily sheathed with mem- 

 brane which usually obscures skeleton; marginal plates well developed; bu] • 

 marginal Bpinee one or two, conspicuous, clearly differentiated from abactinal nn<l 

 surrounded by pedicellariae; inferomarginal spines usually two, sporadically tl 

 bearing pedicellariae and forming definite longitudinal From Bup< 



marginals by n well-defined intermarginal channel; actinal Bpinee with 

 pedicellariae, in one or two longiseries actinals exceptionally spineless) ; two to four 

 pairs of contiguous postoral adambulacral plates; not fissiparous; gonads opei 

 venbrally; young brooded bj adult; Btraight pedicellariae lanceolate, typically not 

 enlarged nor unguiculate. Differing fron tronger abactinal 



skeleton and diplacantbid adambulaoral pli 



Rtmarl In the first refen 1888 Perrier cites D 



Perrier and /' -'• 31 which brood their young He adds 



se dans le genre DipUuterias les Asteriat qui ont deux i m moim 



piquante adambulacraires." 



In the Cape Horn report, published three ■ 

 I., u genus, with the same diagnosis Five Bp 

 /' Perrier, 1 369 ! • Perrier, D. luth Perrii r, /' 



D. - 



D was thus formally published in coi with definite from 



which a type may be selected If the u- i nomen 



nudem, as I her, 1908a, p. 89 the enumeration of D and 



/' both of which are D inthenarrowi J as an indi- 



cation of the Bpeciee which Perrier had in mind fur his new, if somewhat ind 

 While Perrier'a Cape Horn report was in press, Sladen used PeiTM 

 ■ ii. for the type of ( My choice, in 1908, of D 



the type of DipUuterias was ill advised, due to a strict adherence to th< 



rule" fur the determination of ■ type when none is indicated bj the author. 

 I to me that the oldest known sp< I, which inch 



bol i ted bj Pen ier in 1 89 1 > sh< 



rialh appears in the tion 



ly anted en if tl" 



.<• in the light of modern info i 



