STARFISHES OF THE PHILIPPINE SEAS. 281 



cotype) longer than wide, broadly lanceolate, the pointed end prox- 

 imal. Superomarginal plates 26+, a small portion of ray being 

 missing. 



Inferomarginals longer than width of actinal surface (except 

 first 1 or 2), and very narrow distally; 10 plates near middle of ray 

 corresponding to about 16 adambulacrals ; granules alid pedicellariae 

 as on superomarginals. 



Actinal interradial areas with 5 chevrons of plates which are a 

 trifle swollen as in arthrocnemis ; granules coarse, slightly spaced, 

 larger in center than on periphery (not so in arthrocnemis where 

 they are nearly uniform). 



Adambulacral plates with 5 or 6 spines on the first furrow margin, 

 increasing to 11, or even 12 ; a slight angle appearing on the second 

 or third plate but not becoming at all prominent until the eighth. 

 Subambulacral granules 15 to 18 in 3 irregular series. A very few 

 of the proximal plates with a 2- or 3- jawed pedicellaria near the 

 inner adoral corner. 



Marginal mouth spines 9 to 11 (10 or 11 in type), compressed; 

 suboral granules in 2 series, a few of the innermost slightly en- 

 larged. 



Madreporic body medium-sized, surrounded by 5 or 6 plates; it 

 is larger than the primary basal plates and is situated slightly less 

 than one-third r from center — about as in arthrocnemis. 



Type.— Cat. No. 30548, U.S.N.M. 



Type-locality. — Station 5115, ojff northern Mindoro (Verde Island 

 Passage), 340 fathoms. 



Distribution. — Known only from type-locality. 



/Specimens examined. — Two, the type and an example from sta- 

 tion 5114, type-locality, 340 fathoms, fine sand. 



Remarks. — This species, or perhaps only sul^species of arthrocne- 

 mis, is most likely to be confused with that form and with hahro- 

 tatus. It differs from hahrotatus in having square-angled rays with 

 a plane dorsal surface, a closer marginal granulation, the sixth and 

 sometimes the fifth superomarginal longer than width of its dorsal 

 surface (ninth or tenth in hahrotatus) ; 10 inferomarginals corre- 

 sponding to about 16 adambulacrals (13 or 14 in hahrotatus)^ 

 coarser actinal interradial granulation; fewer mouth spines (12 to 

 15 in hahrotatus) ; primary apical plates smaller — not conspicuous, 

 whereas they are in hahrotatus. N. Tneseres seems to be related to 

 both hahrotatus and arthrocnemis .^ and rather closely, though it is 

 separable readily enough with specimens in hand. 



Among the species described by Koehler from the Investigator 

 collections the present form comes nearest to ludwigi, which, how- 

 ever, has wider superomarginals for they are not longer than wide 



