914 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
e. Calyx and arm bases very spiny; distichals 4 (8+4). 
f. First pinnule enormously enlarged with 12 joints; 10 to 12 arms 
up to 110 mm. in length; palmars not present; spines on cirri 
Sharp ies. SE ERE Paes ena gree thalassometra hawaiiensis. 
f’. First pinnule not especially enlarged, with 22 joints; 17 arms 
180 mm. in length; palmars present; blunt spines on cirri. 
Thalassometra gigantea. 
e’. Calyx and arm bases smooth; distichals 2. 
io JUGS Wen SO eles JoOlUs Thalassometra fisheri. 
f’. More than 30 cirrus joints. 
g. Palmars absent; cirri stout with 55-60 joints. 
Thalassometra crassicirra. 
g’. Palmars present on outer side of rays; cirri slender with 40 
JOIN COLES eee Lae eee Thalassometra delicata. 
d’. First two pinnules more slender than their successors with more 
numerous and smaller joints; genital pinnules expanded; all the 
cirrus joints elongated, without dorsal spines__Charitometra lateralis. 
1 Order COMATULIDA. 
Family ATELECRINIDA. 
Genus ATELECRIN US. 
ATELECRINUS CONIFER, new species. 
Centro-dorsal conical, the sides but slightly convex, 5 mm. broad 
at the base and 6 mm. long, bearing 15 columns (5 triple columns) 
of cirrus sockets, about 5 to a column, the cirrus sockets being similar 
in character to those of the other species of the genus. 
Cirri broken; the longest stump, which measures 35 mm., consists 
of 19 joints, of which the first 2 are short, the third about half again 
as long as wide, and the remainder about three times as long as 
wide; the joints do not overlap. 
Basals very narrow, forming a uniform narrow band between the 
radials and the centro-dorsal, not prominent interradially; the proxi- 
mal edge of the centro-dorsal is somewhat prominent in the angles 
of the calyx; radials somewhat over twice as broad as long, closely 
united laterally, the dorsal surface almost flat, the anterior edge 
straight, the posterior convex; first costal not quite so long as broad, 
oblong, slightly incised anteriorly, the dorsal surface moderately 
curved; costal axillaries about as long as broad, nearly square, the 
sides shghtly concave; the brachials are similar to those in A felecrinus 
balanoides, but are proportionately stouter; the junctions between 
the costals and the first two brachials are more tubercular than in 
the other species. | 
The longest arm is broken off at the twelfth brachial. The speci- 
men has no pinnules. 
The entire length of the specimen, from the tip of the centro-dorsal 
to the twelfth brachial, is 25 mm. 
