Miscellanea Zoologica. 379 



lowish, porrect, cylindrical, somewhat thickened outwards, divided 

 beneath by a mesial line, shorter than the mandibles, which origi- 

 nate from the anterior margin of the first segment, and are Particu- 

 late, the basal joint long, while the second forms a short ovate hand 

 armed with two small sub-equal 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 conferva?, 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. 



