E. B. Wilson — Pycnogonida of New England. 
3 
The present paper is purely systematic. The synonymy is not 
intended to contain all the references to the species, but, as a rule, 
only those referring to descriptions or figures. Owing to the close 
general resemblance of the species and the very imperfect descrip- 
tions by many of the earlier writers, it is quite impossible to deter- 
mine, from the descriptions, to what species some of the older names 
should be applied. 
The species here described are included in the genera shown in 
the following table. 
A. Antennas present. 
a. Antennae chelate. 
b. Palpi present. 
(1) Palpi five-jointed 
(2) Palpi eight- jointed. 
bb. Palpi wanting. 
c. Auxiliary claws present. 
(1) Accessory legs, five-jointed 
(2) Accessory legs, nine-jointed. 
cc. Auxiliary claws wanting. 
(1) Accessory legs, eleven-jointed. 
(2) Accessory legs, six-jointed 
aa. Antennae non-chelate, palpi present. 
(1) Antennae rudimentary, one-jointed. 
(2) Antennae, two-jointed. 
A A. Antennae wanting. 
Palpi wanting. 
. -Nymphon. 
-Ammothea. 
Phoxichilidium . 
Pallene. 
. -Pseudopallene, nov. 
Anoplodactylus, nov. 
Tanystylum. 
Achelia. 
Pycnogonum. 
The family characters, as usually given, are somewhat unsatisfac- 
tory. In Semper’s arrangement the Nymphonuloe include those hav- 
ing chelate antennae, the Achtlulm those having non-chelate antennae, 
and the Pycnogonklce those having no antennae. It seems more nat- 
ural to separate from the Nymphonidai , as thus defined, those forms 
in which the palpi are wanting, applying to this group the name 
Pallenidce , from Pallene , the first described genus. This arrange- 
ment is somewhat artificial, but it is a convenient one and may, for 
the present, be retained. 
Family I, Pycnogonida:. 
Pycnogonum Briinnich. 
Body very stout. Antenna* and palpi wanting. Accessory legs 
ten-jointed, wanting in the male. Legs stout, dactylus without aux- 
iliary claws. 
