16 
E. Ti. Wilson — Pycnogonidci of New England. 
Family IV, N ymphonid^e. 
Ammothea Leach. 
Body broad, neck scarcely apparent. Rostrum large, tapering. 
Antennae small, thi-ee-jointed, chelate. Palpi eight-jointed. Acces- 
sory legs nine-jointed; in the male five-jointed (?). Legs slender. 
Auxiliary claws present. 
Ammothea achelioides, sp. nov. 
Plate V, figures \ a to 1 e. 
Body very broad, oval, segments not evident, lateral processes 
scarcely separated. Oculiferous tubercle prominent, acute; eyes 
dark; abdomen long and very slender, bifid at the extremity. 
Rostrum large, tapering, extremity rounded. 
Antennae about three-fourths as long as the rostrum ; basal joint 
narrowest near the middle, somewhat hairy, with one or two promi- 
nent tubercles, each tipped by a slender spine ; chela with the claws 
very slender and strongly curved, armed with a few small spines on 
the opposable edges. 
Palpi slender, longer than the rostrum, sparsely hairy, most so on 
the distal joints ; the first, third, and four distal joints are very 
short ; terminal one shortest ; sixth longest ; the second and fourth 
are nearly equal and more than twice the basal joint. 
Accessory legs, in all the specimens examined, very short, swollen 
and pellucid, so that the joints could with difficulty be distinguished. 
They are composed of five joints ; a very short basal one and four 
other longer ones ; the terminal one is tapering, smoothly rounded at 
the tip. It seems probable that these appendages are either those of 
the male, or of the immature female. 
Legs short, rather slender ; the three basal joints are short, fol- 
lowed by three which are nearly equal and about as long as the three 
basal joints united ; tarsus very short ; propodus gently curved, with 
two stout spines on the inferior margin near the base, followed by a 
few smaller ones ; dactylus nearly two-thirds the length of the pro- 
podus, rather stout ; auxiliary claws two-thirds the dactylus. 
The legs are rough and hairy, the hairs usually arising from tuber- 
cles or swellings. These tubercles are very large and acute-conical 
near the outer margin of the body processes and upon the first joint 
of the legs ; on the outer joints they are smoothly rounded and less 
elevated, often producing a sinuous outline most apparent on the 
fourth, fifth and sixth joints. 
Color of alcoholic specimens, light yellowish brown. Length P4 
millimeters; extent 5 - 2 millimeters. 
