COLE: PYCNOGONIDA COLLECTED AT BERMUDA. 
317 
morph osis, in which the legs with grasping claws are attained, the 
chelifori are not needed for the purpose of clinging, and in the 
adult the fingers of the chelae are lost completely, the organ prob¬ 
ably becoming entirely functionless as well as degenerate in form. 
While I believe this may serve as an explanation of the loss of the 
chelae in the adult Ammothea, we have a different state of affairs in 
Anoplodactylus, which is found associated with it in the ‘ cut,’ for 
the latter retains its chelae throughout the adult condition. In some 
cases at least it would seem that they are probably not needed for 
attachment even by the larva, which is parasitic in the gastral cavity 
of certain hydroids (cf \ Dohrn, ’81, pi. 12, fig. 25, who shows three 
larvae of A. [= Plioxichilidiuni\ exiguus in the interior of a polyp 
of Podocorgne carnea) ; but in the larvae of A. plumidariae (von 
Lendenfeld) Cole, although they are parasitic, the chelifori are 
strongly developed and are used for clinging to the hydroids, into 
which the proboscis is thrust in order to obtain nourishment (von 
Lendenfeld, ’83). In the adult Anoplodactylus they are probably 
not used at all for clinging; but it seems more probable that in these 
forms they are retained for some function which they perform in 
connection with feeding, for they are always elongate and the chelae 
hang down over the proboscis in close proximity to the mouth 
(pi. 22, figs. 21, 29). 
Professor Verrill has very kindly allowed me to examine the 
types of his two species, and this has been of great assistance in 
writing the present report. He has also placed in my hands for 
study three specimens which his party collected at Bermuda, in 
1901, and three others obtained by G. Brown Goode, in 1876-77. 
All of these belong to the two species found by Verrill in 1898. 
Some further notes and descriptions of these species are given 
below, together with the addition of a new form, which, however, so 
closely resembles Anoplodactylus insignis (Hoek) that I have 
placed it as subordinate to that species. The typical insignis is 
known from but a single specimen dredged by the ‘ Challenger ’ at 
Bahia, South America. 
Ammothea gracilis (Verrill). 
PI. 21, fig. 4-14. 
Achelia (?) gracilis Verrill, : 00, p. 582, pi. 70, fig. 10. 
