122 " ENDEAVOUR " SCIENTIFIC RESULTS. 



margin. In the antero -lateral interambulacra the margin 

 is densely clothed with secondary spines and 15-20 rather 

 small primaries ; there are also a few secondaries close to 

 the mouth. In the lateral (or postero-lateral) areas the 

 margin is densely coated with secondary and mihary spines 

 and inwardly with 7 or 8 obhque series of large primaries, 

 4-5 in each series. Within the subanal fasciole there is on 

 each side a group of 10-12 primary spines, and below it is a 

 triangular area (with apex towards mouth) well covered with 

 secondary and mihary spines. All the rest of the oral surface 

 seems bare, but is in reality sparsely covered with minute 

 miliary spines and pedicellariae. The hp, however, bears a 

 dense cluster of secondary spines, and there are smaller and 

 less dense clusters on each side of the mouth, while similar 

 spines are borne on the peristomal plates themselves. Phyl- 

 lodes conspicuous, though in each one of the posterior pair 

 there are only 7 of the ambulacral " brushes." Peristome 

 covered by about 50 plates. Periproct covered by about 60 

 plates, each with 1-4 miliary spines. 



Pedicellariae abundant, of 4 kinds, each of which has 3 

 valves to make up the head ; the valves of the globiferous 

 pedicellariae are about 1 mm. long, the terminal third or 

 more encased in the glandular tissue ; these valves resemble 

 those of Lovenia elongata as figured by Koehler^, but the 

 blade narrows steadily to the truncate tip which terminates 

 in 4 rather short but distinct teeth, lying practically in the 

 same plane ; the valves of the tridentate pedicellariae are 

 about .80 mm. long and resemble those of Spaiangus ; they 

 are strongly curved, meeting only at tip ; the base is higher 

 than wide, the blade is less than half the length, and its own 

 width (which is greatest distal to its middle) is less than half 

 its own length ; its margin is smooth, becoming finely serrate 

 near tip ; the valves of the ophicephalous pedicellariae are 

 only about .40 mm. long ; they resemble very closely those 

 of Maretia elevata as figured by Doderlein^ ; the valves of 

 the triphyllous pedicellariae are very small, about .20 mm. 

 long, and are borne on the end of a very long neck ; they 

 resemble very closely those of Metalia maculosa as figured by 

 Koehler^. The triphyllous pedicellariae seem to occur every- 

 where on the test, the ophicephalous are mainly if not alto- 

 gether abactinal, the tridentate occur on both the upper and 

 lower surfaces, but seem more abundant actinally, and the 

 globiferous are actinal, occurring chiefly near the mouth. 



1. Koehler — Indian Mus. Spat., 1914, pi. xix., fig. 27. 



2. Doderlein — Valdivia Ech., 1906, pi. xlviii., fig. 6a-d. 



3. Koehler — Indian Mus. Spat., 1914, pi. xix., fig. 70. 



