126 ON THE DEVELOPMENT OF 
(Johnston)*, may frequently be taken at low-water mark, crawl- 
ing or, rather, sprawling over Algz and Zoophytes, more fre- 
quently the latter. In most instances I have met with them on 
a muddy bottom, probably because the Zoophytes on which they 
seem to feed are found there. During a careful and systematic 
series of “ rock-hunts,” undertaken with the view of obtaining a 
collection of the smaller and rarer marine animals of this part of 
our coast [Seaham], I collected a handful of a species of Coryne 
(C. eximia, Allman) from a small rock-pool, under the shelter of 
the overhanging side of which depended a most interesting fringe 
of Zoophytes, such as Coryne, Tubularia, Plumularia, §c. The 
Coryne was very abundant; and many of the polyparies attained 
the unusual length of 8 to 4 inches, and were, at the period when 
taken (August), profusely covered with Medusoids in various 
stages of growth. As I collected these specimens, I noticed 
some peculiar dark brownish-red pear-shaped sacs scattered 
over the stems, more especially on the lower portions. Con- 
cluding they were some peculiar organisms connected with the 
growth of the Coryne, they did not receive more than a passing 
glance; but on arriving at home, the specimens were turned out 
* Orithyia coccinea, Johnston. “ Animal araneiform, slender, of a uniform 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 yellowish, porrect, cylindrical, somewhat thickened outwards, divided 
beneath by a mesial line shorter than'the mandibles, which originate from the anterior mar- 
gin of the first segment, ana are biarticulate ; the basal joint long, while the second forms 
a short ovate hand armed with two sub-equal curved claws: body 4-jointed, the first with 
an oculiferous tubercle; the eyes obscure: legs fonr pairs, with a few widely scattered 
short hairs ; three times the length of the body, equal, 8-jointed ; the basal joint short; 
the second somewhat longer than the third; the fourth slightly dilated, elongate; fifth and 
sixth slenderer, but as long ; seventh minute; eighth rather long, faleiform, spinous on its 
inferior edge, and terminated by a single rather longclaw. [There are two claws: one 
is very small, and is rather difficult to see, from its position ; it issues from the base of the 
largerclaw, near to its insertion into the falciform joint, and clings closely to it.— 
G.H.] Length of the body 2 lines, of the legs 6 lines. With a common magnifier, the hody 
appears very smooth; but when a more powerful glass is used, it and the legs are seen to 
be roughish with minute granules.” (‘‘ An Attempt to ascertain the British Pycnogonide,” 
by Geo. Johnston, M.D., in ‘ Magazine of Zoology aud Botany, vol. i.) Phoxichilidium 
coccineum, Milne-Edwards, ‘ Crust.’ vol. iii. p. 536, 1840. (Goodsir, in ‘ Annals and Magazine 
of Natural History,’ vol. xiv. 1844.) Nymphonfemoratum (Rathke, Nat. Hist. Skrifter, vol. 
i. p. 201). Phoxichilidium femoratum, Kroyer, in ‘Annales des Sciences Naturelles’ for 
1842. In speaking of this species, he says, ‘‘I believe this animal identical with the Orithyia 
coccinea from the coasts of England.” 
