Miscellanea Zooloyica. 371) 
lowish, porrect, cylindrical, somewhat thickened outwards, divided 
beneath by a mesial line, shorter than the mandibles t which origi- 
nate from the anterior margin of the first segment, and are biarticu- 
late, the basal joint long, while the second forms a^short ovate hand 
armed with two small sub-equaj curved claws: body 4-jointed, the 
first with an oculiferous tubercle, the eyes obscure : legs four pairs, 
with a very 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, fal- 
ciform, spinous on its inferior edge and terminated by a single rather 
long claw. Length of the body two lines, of the legs six. With a 
common magnifier the body appears very smooth, but when a more 
powerful glass is used it and the legs are seen to be roughish with 
minute granules. 
O. coccinea lives among sea weeds between tide marks ; and 
when at rest, with the legs drawn up, it so closely resembles some 
of the fine-coloured confervse, but more especially a detached portion 
of the Chondria articulata, as to be easily overlooked. It appears to 
me interesting in so far as its transparency allows us to examine its 
circulating system with an accuracy which perhaps no dissection 
could enable us to amend. Close to the oculiferous tubercle we see 
the vessel (for there is no heart) divide into two equal branches, one 
to each mandible ; and the flux and reflux of a fluid is easily observ- 
able in them. From the tubercle the vessel runs down the body, 
giving off a single branch, equal in size to the trunk, to each leg ; 
and this branch continues uninterrupted to the tarsus. Neither in 
the trunk nor branches could any movement of the fluid be per- 
ceived. 
The ova are carried under the body of the female, which is com- 
paratively very rare, collected into eight globular packets of a yel- 
lowish colour. They are attached to the oviferous filaments which 
originate from the first segment between the base of the proboscis 
and the legs, and consist of five joints, the basal one ovate, while 
the four following are cylindric, elongate, subequal, or rather the ter- 
minal one is the shortest. There is no vestige of these organs in the 
male ; nor the slightest trace of palpi in either sex. The segments 
of the thorax are so prominent at the sides that the coxae appear to 
be composed of four instead of three articulations. 
Fig. 4. Orithyia coccinea, nat. size. 5. the same magnified. 
6. the anterior part of the female seen from below and magnified. 
