HOLOTHURIOIDEA. IV, B. 
Ech. 29 
O. affinis, near Malpelo Id., 1772 & 1823 fms., with dorsal papillae in 
double rows; Ludwig (70) Mem. Mus. Harvard, xvii, 3, p. 72, 
n. sp. 
Pcelopatldes , rediagnosed ; Ludwig (70) p. 21. P. confundens, rede- 
scribed with internal anatomy, held to include P. agassizi ; Ludwig 
( 70) p. 14. 
P. suspecta , Gulf of Panama, 1270 fms. ; Ludwig (70) Mem. Mus. 
Harvard, xvii, 3, p. 20, n. sp. 
Pamychia , cf. moseleyi , spicules ; Kisiiinouye (51), and Ludwig 
(G8). 
P. moseleyi , n. var. fienrici , E. Central Pacific, 770 to 1421 fms. ; Ludwig 
( 70) Mem. Mus. Harvard, xvii, 3, p. 95. 
Pelagothuria , a free-swimming pelagic Holothurian ; Ludwig (67). P. 
natatrix [introduced as n. g., n. sp., but see Zool. Rec. 1893], fully 
described and figured; Ludwig (70) p. 114. 
relagothuriidce, the family diagnosed ; Ludwig (70) p. 121. 
Pcniagone vitrea , var. setosa , fully described ; Ludwig (70) p. 105. 
P, intermedia , E. of Galapagos, 1322 fms.; Ludwig (70) Mem. Mus. 
Harvard, xvii, 3, p. 108, n. sp. 
Phyllophorus urna ; Marenzeller (75) p. 23 ; at Cette ; Koehler (55) 
p. 7. 
P. aculeatus , Panama ; Ludwig (70) Mem. Mus. Harvard, xvii, 3, p. 128, 
n. sp. 
Pseud ocucinnis acicula*, Sluiter (111) p. 105. 
Pseudostichopus, rediagnosed; Ludwig (70) pp. 10 & 14. P. mollis, range 
extended N. of Equator, redescribed ; Ludwig (70) p. 8. 
P. occultatus , Eastern Mediterranean, 415-1445 metres, protected by 
covering of foreign objects; Marenzeller (75) Denk. Ak. Wien, 
lx (v) p. 15, h. sp. 
Psolidium , rediagnosed, key to species; Ludwig (70) p. 135. P. dor sipes, 
discussed; op. cit., p. 131. 
P. gracile, Gulf of Panama, 1270 fms. (p. 132) ; P. panamense, Gulf of 
Panama, 1270 fms., an intermediate form between Cucumaria and 
Psolus (p. 129) : Ludwig (70) Mem. Mus. Harvard, xvii, 3 : 
n. spp. 
Psolus , evolution of genus (p. 131); P. sp., juv., Gulf of Panama (p. 140): 
Ludwig (70). P. fabricii ; Pfeffer (93) pp. 110 & 123. P. 
phantapus ; ll. c. P. squamatus ; Meissner & Collin (80) 
p. 345. 
P. digitatus. Gulf of Panama, 695 fms., peculiar tentacles (p. 138); P. 
diomedeoz, Cocos Id., 66 fms. (p. 136) \ P. pauper, *S. of Las Tres 
Marias, W. of Mexico, 676 fms., perhaps only a var. of P. fabricii 
(p. 139): Ludwig (70) Mem. Mus. Harvard, xvii, 3 : n. spp. 
Psychropotes dubiosa , off Ecuador, 1823 fms. (p. 52); P. raripes, N. W. 
of C. San Francisco, 1573 fms. (p. 48) : Ludwig (70) Mem. Mus. 
Harvard, xvii, 3 : n. spp. 
