16 Description of Genera and Species. 



phausia, and consists of five joints set witli stronp' settxj and curved inwards in the same 

 manner ; but in the present species the limb is relatively larger and longer than in the 

 recent genus. The base of the limb is obscure, and the connection of the limb with 

 the peculiar epipodite also cannot be observed. A structure which is probably 

 the extremity of the epipodite is seen in the specimen from which fig. T" is 

 taken. It is acutely triangular and pitted in a manner like that organ in 

 Gnathophausia. 



The maxillipedes are followed by seven pairs of limbs corresponding to the trunk 

 segments from 6-13 inclusive. All these limbs are constructed on the same principle and, 

 with only some slight modifications, the same parts enter into each. The endopodites 

 are all pediform, and consist of seven joints. As in Gnathophausia, the anterior limbs 

 are stouter than the hinder ones, and there is along with this a difference in the propor- 

 tional length of the component joints. As in Gnathophausia, they are laterally compressed 

 and set along their inferior edges with setix;. In the first pair, which are the most massive, 

 the inferior edge is closely and evenly set with strong setas, whereas in the hinder ones, 

 to judge from the pits out of which they spring, they seem to have been arranged in 

 tufts. The terminal joints appear to have been in all cases spatulate, and no terminal 

 claw has been observed. The structure and arrangement of the endopodites of all these 

 limbs seems to fit them better to form a great straining apparatus for the entrapping 

 of minute organisms rather than for crawling or swimming. The limbs all flex 

 in such a manner as to suggest that they are intended to bring the objects of their 

 capture within reach of the palps of the mouth organs which, in the recent Lopho- 

 gastrids, are abundantly set with sensory hairs. 



The exopodites which spring from the base of each liml) consist of a strong, very 

 muscular basal joint surmounted by a powei-ful many -jointed swimming lash fringed with 

 setffi on each side, the comparative length of the two branches of each limb varying from 

 2-1 or 3-2, the endopodite being in every case the longer. 



Only the sternal branches of the gills have been observed, the trunk arteries of 

 which appear to be given off from the leases of the legs (fig. 7^). To judge from the 

 imperfectly preserved specimens at command, where the blood vessels are either collapsed 

 or split up the middle, the arrangement of the branches and lobules is more like that which 

 tak(!s place in Eucop>ia than in Gnathophausia, and this is borne out by the more perfectly 

 preserved gills in the very nearly allied Tealliocaris icoodwardi (pi. ii.,^fig. 4*). In the 

 females the bases of the limbs give off breeding lamella? (figs. 4, 6), and it is probable that 

 all the seven pairs were supplied with them. They are even better displayed in specimens 

 of the closely-related T. woodwardi (pi. ii., figs. 1, 3, 3*) in the form of a series of over- 



