STARFISHES OP THE PHILIPPINE SEAS. 483 



proximally, becoming 2 on the outer third or two-fifths of ray. There 

 are small triangular superambulacral plates. Ampullae double, but 

 the outer division very short, while the inner is vermiform and 3 or 

 4 times as long. 



Specimen from vicinity of Darvel Bay^ Borneo^ station 5582. — 

 R=205 mm., r=l7 mm., R=12 r. In this example there is no sign of 

 granulation on the abactinal plates of the disk and only the last 

 dozen marginals at the tip of ray have an inconspicuous armature. 

 The superomarginals usually have 2 appressed spinelets, and the in- 

 feromarginals 1. On the basal third of the ray there are 4 lateral 

 series of naked plates, covered with smooth skin, then 3, and finally 

 near the tip of ray, 2. The enlarged central spine of the 3 actinal 

 intermediate series occurs almost always only on alternate transverse 

 (or vertical) series. The prominent adambulacral plates have gen- 

 erally a transverse series of 4 spines, the furrow spine only bearing 

 an equally long pedicellaria with jaws curved at the ends, accom- 

 panied by 1 or 2 small ones. The 2 outer spines are flattened and 

 squamiform, while the second is intermediate. There are 2 much 

 shorter lanceolate leaflike spinelets adoral to the spines. The non- 

 prominent plates have 5 squamiform spines, but the furrow spine has 

 a pedicellaria only irregularly and at the base of ray. 



This example is extremely close to Cnemidaster zea (Alcock), the 

 only difference of importance seeming to be the restriction of the 

 lateral spines to alternate vertical rows of plates. The description of 

 zea does not particularize on this feature, so that the arrangement 

 may be somewhat irregnilar, as in the specimens from the Gulf of 

 Tomini. Of the adambulacral armature of zea^ Alcock says: The 

 adambulacral plates are covered with flat f oliaceous spinelets ; every 

 alternate plate has a prominent intraambulacral ridge, bearing a row 

 of 3 saber-shaped spines, and deep within the furrow a slender spine- 

 let furnished with several pedicellariae one of which is large." The 

 type of zea has R, 144 mm., r, 12 mm. 



Type. — In the British Museum (Natural History). 



Type-locality. — Challenger station 191, Arafura Sea, northwest of 

 the Aru Islands (lat. 5° 41' S.; long. 134° 4' 30'' E.), 800 fathoms, 

 green mud, bottom temperature 39.5° F. 



Distribution. — Vicinity of Darvel Bay, Borneo; Gulf of Tomini, 

 Celebes; Arafura Sea; 761 to 1,089 fathoms; temperature range, 

 36.3° to 39.5° F. 



Specimens examined. — Seven, from the following stations : 



Station 5582, vicinity of Darvel Bay, Borneo, 890 fathoms, gray 

 mud, fine sand, bottom temperature 38.3° F. ; 1 specimen. 



Station 5602, Gulf of Tomini, Celebes (lat. 0° 22' N. ; long. 132° 

 03' 30" E.), 962 fathoms, gray mud; 2 specimens. 



Station 5606, same locality, 834 fathoms, green mud; 1 specimen. 



