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evenly distributed over its surface; basal portion of animal widening rapidly in 
a broad curve, reaching the maximum width at the axillary; radials short, more 
than twice as broad as long in the median line, their dorsal profile, which is 
convex, making an angle of about 90° with each other, or of 45° with the 
dorsoventral axis (west of Tasmania; 4680 Metres) carpenteri 
a" Centrodorsal about as high as broad at the base, bearing cirri only about the 
dorsal pole, the basal half or more being smooth and without cirrus sockets ; ' 
basal portion of the animal constricted, the sides of the I Br series and arm 
bases, which make approximately a straight line, diverging slowly at the very 
small anofle with the dorsoventral axis so that the maximum width is at the 
height of the second brachial ; radials longer, twice as broad as long in the 
median line, the dorsal profiles, which are concave, making an angle of 60° 
with each other, or of 30° with the dorsoventral axis (west of Japan; 5220 
Metres) abyssicola 
1. Bathymetra carpenteri A. H. Clark. 
P. H. Carpe:<ter. "Challenger" Reports. Comatulae, 1888, p. 191 (part), pi. 33, fig. 2 (not 
fig. i) {Antedon abyssicola). 
A. H. Cl.\RK. Proc. U. S. National Museum, vol. 34, 190S, p. 235 [Bathymetra carpenteri). 
2. Bai/iyinetra abyssicola (P. H. Carpenter). 
P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 191 (part), pi. n, fig. i (but 
not fig. 2) [Antedon abyssicola), 
Thaumatometra A. H. Clark. 
Key to the Species of the Genus Thaumatometra. 
a^ Large, the arms being from iio mm. to 130 mm. long; Pj 20 mm. long 
with 35 segments of which the proximal 12 are short and wide, mostly 
wider than long, and the distal 23 are elongated and slender; P., slightly 
shorter with 20 segments of which the 2 basal are wider than long- and 
the distal 10 are much elongated, the basal 10 carinate; following pinnules 
similar to P^; cijri XL — L, 20, 35 mm. long (western part of the Sea 
of Japan and the Gulf of Tartar y from Korea northward to 
Sakhalin Island [to 47' 38' 40" X.] ; 144 — 1116 [? 1440] Metres). . tenuis 
a'- Smaller, the arms never over 45 mm., and very rarely over 30 mm. in length; 
Pj with not over 20, and rarely over 15 segments; cirri with a maximum 
of 18; and rarely over 15 segments 
b^ 14 — 18 (usually 15) cirrus segments, of which the longest are from three 
to four times as long as the proximal diameter 
c^ cirrus segments much elongated, subequal, the antepenultimate about 
