174 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



a pedicellaria substituted for it, all of which aifordy a great variety 

 to the armature of the proximal plates. The figures will give a 

 better idea than description of the relative size of the pedicellariae 

 and spines of typical plates. Even here there is variation in the 

 size of the pedicellariae and relative lengths of the 3 or 4 spines. 



The jaws are very narrow, and the pair form a sort of crest, 

 along the top of which, bordering the median suture, are upward 

 of 20 spines to each plate, increasing very rapidly in length toward 

 the innermost, which is two-thirds as long as the interradial length 

 of the plates. On the true, short margin, facing actinostome, are 

 often 2 large two- jawed pedicellariae with a spine or two between 

 them, that which is under the above-mentioned long superficial 

 spine having jaws slender and half the interradial length of the 

 plate, or slightly more. The lateral pedicellaria is smaller — one- 

 third to two-thirds the length of the larger one. These pedicellariae 

 are not present in Integra. 



AnatomiGol notes. — ^The gonads extend in a series of distinct 

 tufts far along the ray, and each gonoduct opens on the inner proxi- 

 mal angle, between the processes of the base of the paxillae ad- 

 jacent to the superomarginal. The paxillae of the 3 regular dorso- 

 lateral series have a cruciform base, either transverse process being 

 a little longer than the 2 longitudinally directed ones, but the 

 superomarginals are more nearly lozenge shape, longer than wide, 

 with sometimes 2 processes on the side next to the adjacent paxillae. 

 The median small paxillae have 3 or 4 short lobes, irregularly 

 placed. 



Type.— C?ii. No. 32624, U.S.N.M. 



Type-locality. — Station 5391, between Samar and Masbate (lat. 

 12° 13' 15'' N.: long. 124° 05' 03" E.), 118 fathoms, bottom un- 

 recorded; 1 specimen. 



Distribution. — Known only from the type-localit}^ 



Remarks. — Luidia integra Koehler (1910«, p. 18; pi. 2, figs. 5-8) 

 w^as taken by the Investigator off the Andaman Islands (lat. 13° 06' 

 N. : long. 93° 08' E.), 60 to 75 fathoms. L. avicularia very closely 

 resembles it, and is evidently what is sometimes called a representa- 

 tive species. As only one specimen of each species is known, some 

 of the differences enumerated in the diagnosis may not prove to be 

 constant. 



I have been able to compare the type of aviodaria with an excel- 

 lent example of L. nwroisoana Goto, from station 3739, Sagami Bay, 

 Japan, 55 to 65 fathoms, volcanic sand, shells, rocks. This specimen 

 is in the United States National Museum, and a ix)rtion of the ab- 

 actinal surface, enlarged, is figured on plate 44. figure 3. The two 



