34 Mr. G. Hodge on the Development of a Species of Pycnogon. 
of attention. Many naturalists, during their mvestigations, 
must have noticed and recorded certain facts bearing upon these 
points; but it unfortunately happens that these have either re- 
mained unpublished, or are inaccessible to the ordinary student, 
who is therefore left to grope in the dark, and to rely upon his 
own observations and research for any knowledge of this interest- 
-ing subject that he may be desirous: of obtaining. Little has 
been said of the anatomical differences of the sexes; we only 
know that most, if not all, of the females of the several species 
possess an additional pair of members, anterior to the ordmary 
feet. These members, known by the name of ‘ false feet,’ differ 
in different genera, have been made an important aid in classifi- 
cation, and are furnished with a number of sete, of forms vary- 
ing according to the genus or, it may be, species; and near to 
these sete, at certain periods, the eggs or ova are found. 
We know nothing of the earliest stage, or means by which 
the ova are produced and fertilized ; and, so far as I am aware, 
the subject has not been alluded to by any writer on these ani- 
mals. The only published record to which I have had access is 
a paper by Kroyer in the ‘ Annales des Sciences Naturelles’ for 
1842, being “ Notes on the Metamorphosis of the Pyenogonides,” 
wherein the larval forms, as attached to the females of Pyeno- 
gonum littorale, Nymphon grossipes, and. Phoaichilidium femoratum, 
are figured and described. I have also been kindly favoured by 
Mr. Spence Bate with some MS. notes “On the Morphology 
in the Development of the Pyenogonidz,” which were read at the 
British Association Meeting of 1855. These authors, however, 
go no further than the larval forms, and make no allusion to the 
subsequent stages through which the young animals pass before 
they attain the mature state ; therefore the following observations, 
although imperfect in some most important particulars, may 
perhaps be the means of guiding others in the search, and thus 
ultimately lead to the complete elucidation of the development 
of the Pyenogonoidea. 
The species that afforded me material for the following ob- 
servations, and which I believe to be Phowxichilidiwm coccineum 
(Johnston)*, may frequently be taken at low-water mark, crawl- 
* Orithyia coccinea, Johnston. “ Animal araneiform, slender, of a uni- 
form fine clear red colour, with the joints of the legs and tarsi yellowish, 
and, when magnified, a central vessel, distinguished by its deeper tint, is 
seen running uninterruptedly through the body and legs: rostrum yel- 
lowish, porrect, cylindrical, somewhat thickened outwards, divided beneath 
by a mesial line shorter than the mandibles, which originate from the 
anterior margin of the first segment, and are biarticulate; the basal joimt 
long, while the second forms a short ovate hand armed with two subequal 
curved claws: body 4-jointed, the first with an oculiferous tubercle; the 
eyes obscure: legs four pairs, with a few widely scattered short hairs ; 
