A. E, Verrill — Hevision Genera and Species of Starfishes. 183 



papular pores large, single, about six around each plate, except that 

 there are none between those plates in the middle radial rows ; a row 

 on each outer border of the abactinal space extends nearly to the 

 end of the rays, or to within about ten marginal plates of the end, 

 and as far as the rows of lateral plates extend. 



The median series of plates extends about four or five plates 

 farther than the lateral, but ceases within four or five plates of the 

 tip ; from thence the marginal plates are in contact. 



Upper marginal plates bevelled and covered with small, sharp, 

 spaced spinules; the upper spinules are shorter than the lower ones, 

 larger, stouter, acute, divergent ; those around the margins are 

 similar and do not form regular fascicles. 



Lower marginal plates large, roundish, with one or two marginal 

 series of sharp, divergent, stout spinules, and a central larger one. 

 Sometimes there are three to five central spinules on th.e dorsal plates 

 and on the row of plates next to the adoral plates. Pedicellariae small, 

 narrow, elevated, spatulate in form and rather numerous on the 

 dorsal side. Lesser radius, 18™™; greater, 59™™. 



Station 295, Blake Exped,, 180 fathoms. This species was also 

 taken by the Albatross in the West Indies. 



Mediaster arcuatus (Sladen). 



Pentagonaster arcuatus Sladen, Voy. Chall., Zooi., vol. xxx, p. 277, pi. xviii, 

 figs. 5, 6 ; pi. lii, figs. 1, 2, 1889. 



This species has a few small pedicellarise on the abactinal plates, 

 similar in size to the granules. 



South of Yeddo, Japan, 345 fathoms. 



Mediaster Japonicus (Sladen). 



Pentagonaster Jajjonicus Sladen, op. cit., p. 272, pi. xlvi, figs. 1, 2; pi. xlix, 

 figs. 1, 2, 1889. 



This species has rather large, sessile, bivalve pedicellarise with 

 broad valves, on the adambulacral plates ; others of smaller size 

 occur on many of the actinal plates. Some of the pedicellarite have 

 three valves. 



South of Yeddo, Japan, with the last. 



