1128 
BULLETIN OP THE UNITED STATES FISH COMMISSION. 
PLATE XXXVIII. 
Fig. 1. Artseropoda insignis. Fourth to eighth adambulacral plates and adjacent actinal intermediate | 
plates, X8. The actinal adambulacral spinelets (ad. I?) are shown in 2 different positions, £ 
the upper being the more usual. The fans of the actinal plates are just to the left of these. I 
ad. 1 ., furrow spinelets. la. Abactinal plates, interradial, about 30 mm. from edge of disk, | 
and from radial line. 
Fig. 2. Henricia robusta. Adambulacral plates, XlO. 2a. Abactinal surfaces, middle of arm, X10. I 
Fig. 3. Henricia pauperrima. Abactinal surface near base of ray, X20. 3a. Seventh and eighth ad- 
ambulacral plates seen from furrow, showing the 2 furrow spinelets, Xl2. 
Fig. 4. Valvaster striatus. Adambulacral plates, near base of R, X 10. 4a. Marginal plates viewed 
from the side, showing the very large superomarginal pedicellarise, and inferomarginal spine, 
XlO. 
Fig. 5. Pteraster reticulatus. Adambulacral spines, X5- ap. p., aperture papilla. 5a. Supradorsal 
membrane near center of disk. 
Fig. 6. Hymenaster pentagonalis. Adambulacral plates, X8. ap. p., aperture papilla. § 6a. Mouth 
plates, X3. lst.ap., first aperture papilla, imbedded in actinolateral membrane. 66. An 
actinal mouth spine from cotype. 
Fig. 7. Benthaster eritimus. Paxillse much enlarged, and seen from side to show height of pedicels and . 
general surface of supradorsal membrane (dotted line) . 
PLATE XXXIX. 
Fig. 1. Pteraster reliculatvs. Actinal surface of type, enlarged, about 1.8 diameters. 
Fig. 2. Same. Abactinal surface, slightly larger than natural size. 
Fig. 3. Ophidiaster lorioli. Abactinal surface of type, enlarged about 2.7 diameters. Photo by N. H. 
Kent. 
PLATE XL. 
Fig. 1. Benthaster eritimus. Actinal surface (interradial), showing actinolateral spines, membrane, 
adambulacral plates and armature, and the mouth plates, XlO. The first aperture papilla is Jl 
multifid and is lodged in the actinolateral membrane; the rest are free and lanceolate- 
acuminate. The circular bodies showing through the actinolateral membrane are the large » 
bi- or tri-lobed, fleshy glandular papulae. A number of the adambulacral plates have the \ 
furrow spinelets removed, la. A portion of supradorsal membrane much magnified, to show 
spiracula, muscle fibers, and spines. 16. Abactinal aspect of entire animal, X3. The supra- 
dorsal membrane is broken open in places. 
Fig. 2. Hymenaster pentagonalis. Small portion of supradorsal membrane near radial line showing I 
spiracula and papillae, X8. 
Fig. 3. Asthenactis papyraceus. Plates of side of ray in a dry specimen, a few of the dorsal plates f 
showing above, X8. The fascicles of spinelets haye been removed from most of the plates, I 
and the integument has entirely dried up. -In life the plates are not superficially visible. | 
3a. Actinal surface showing one interradius, adambulacral and mouth plates, and the 
incipient actinolateral membrane, enlarged about 5.5 times. 1, 2, 3, first to third adambu- } 
lacral plates. 4s. Spines on the fourth adambulacral plate. 3s'. Spines on process of third 
plate, but forming a single series with those of fourth (4s) . 2s'. Similar spines on process ? 
of second plate. 
PLATE XLI. 
Fig. 1. Hymenaster pentagonalis. Abactinal view of cotype, X0.75. 
Fig. 2. Zoroaster spinidosus. Adambulacral' plates, XlO.' 
Fig. 3. Hydrasterias verrilli. Actinal surface, showing furrow margin and actinal spines, X8. 3a. H 
Radial and either adradial series of plates in a dried specimen, X6. 36. Abactinal pedi- 
cellaria. 
Fig. 4. Cosdnasterias ( Distolasterias ) euplecta. Furrow margin and actinal spines, X8. 4a. Furrow * 
spines seen from furrow, X8. 46. Abactinal pedicel larite, X35. 4c. Teeth of same. 
