ATLANTIC AND CARIBBEAN PYCNOGONIDA—HEDGPETH 259 
Remarks.—The legs of one specimen have a vestment of very fine 
setae, those of the other specimens are glabrous. There is no sig- 
nificant variation in the size of the specimens. This species is closely 
related to Ascorhynchus abyssi Sars, 1891 (=A. tridens Meinert) from 
which it differs in the shape of the chelae and the shorter terminal 
claw. A. abyssi is a blind deep-water species, and does not have a 
fourth dorsal tubercle over the base of the abdomen. This is evi- 
dently a widely distributed Caribbean species, to judge from its 
occurrence in both Florida and southern Hispaniola. 
ASCORHYNCHUS SERRATUM, new species 
Figure 44, a-f 
Holotype (female).—U. 8. N. M. No. 81101, Albatross station 2359, 
Jan. 29, 1885, off Yucatdn, lat. 20° 19’ 10’’ N., long. 87° 03’ 30’’ W., 
231 fathoms. 
Description.—Trunk slender, lateral processes separated by their 
own diameter. Dorsal trunk tubercles on first three trunk segments, 
tall, sharp; tubercles on lateral processes about two-thirds as tall. 
Kye tubercle near anterior end of neck, tall as dorsal tubercles, sharply 
pointed. Eyes about one-third from tip. 
Proboscis pyriform, nearly as long as trunk, blunt at tip. 
Abdomen as long as third trunk segment, slender, tip curved 
ventrally. 
Palpus 8-jointed, longer than trunk. Second joint longest, fourth 
about two-thirds as long as second. Terminal joints slender, the last 
three setose ventrally. 
Chelifore: Scape 2-jointed, the second slightly shorter than the 
first. Chela rudimentary. 
Oviger 8-jointed, third slightly longer than fourth, with an angular 
projection near the distal third. Terminal joints with a row of long 
denticulate spines. Terminal claw curved, without denticulations, 
about half as long as terminal joint. 
Leg slender, coxae without lateral projections or tubercles. Second 
coxa longer than first and third together. Femur slightly longer than 
first tibia, second tibia longer than femur, but shorter than first. 
Tibiae with spines slightly longer than the diameter of their joints, 
along their entire length. Tarsus little more than one-third as long 
as propodus, with a row of close-set ventral spines. Propodus slender, 
slightly curved, with about 20 spines on the sole. Terminal claw 
about as long as the tarsus. 
