ISOPODA OF THE 'LIGHTNING' AND OTHER EXPEDITIONS. 91 



as broad, widest distally ; hand with a very long thumb and finger, closely resembling 

 the corresponding parts in the female of Apseudes talpa. 



Second gnathopods having the basos strongly built, and of uniform width throughout ; 

 following joint short ; the rest of the limb imperfect. 



The condition of the last legs {n.prp^) is also such that we are unable to describe the 

 garnishing of cilia, setae, and spines as accui'ately as has been done in the case of other 

 species. The basos is long; carpus longer than either meros or hand, which are 

 subequal to each other, these three joints flattened. Carpus having a vertically- 

 plumose seta infero-anteally ; hand ovately rounded distally, with three or four small 

 cilia on the hinder border ; front margin naked on the first third, then a long spine ; 

 beyond this this margin is pectinately spined, the pectination, as usual, extending round 

 the extremity, there is also a long spine above the insertion of the finger ; finger long, 

 slender, and gently curved. The coxae of this and of the two preceding pairs of feet 

 are distinctly protruded as joints beyond the coxa-like looking epimera (the limbs thus 

 looking as though they were eight-jointed), and are armed behind with a curved spine ; 

 the coxa of the third legs has also a curved sharp spine, but this is on the front side, 

 and directed forwards, like the characteristic process of the second legs. 



Length one third of an inch. 



A single example from the ' Porcupine ' Expedition in 1870, dredged in the Mediter- 

 ranean oif the coast of Algeria (Station 50, 51-510 fathoms). 



7. Apseudes simplicirostris, n. sp. (Plate XVIII. fig. i.) 



Male. Frontal region (i. d) produced into a long, gradually attenuated, rostral spine, 

 inclining downwards; though long as compared with the carapace, the rostrum is 

 scarcely more than one third the length of the very long basal joint of the upper 

 antennae; the frontal region has a minute projection on each side of the base of the 

 rostrum. 



Ocular processes wide and short, but produced apically into a point, which, however, 

 is so bent down as not to be visible from above. 



Carapace having the cephalic portion narrow, the sides without any of the projecting 

 angular processes which are present in A. lunarifrons (which is perhaps its nearest 

 ally), and gradually converging towards the frontal region ; the soldered first thoracic 

 segment, however, suddenly widens, the sides being boldly arched, and here is the 

 greatest width of the body. 



Peraeon remarkable on account of the irregularity of outline of the sides ; each of 

 the last four segments has its anterior portion narrow, and is behind considerably 

 expanded over the coxae; the third and following segments have each a pair of 

 laterally directed spine-like processes, those of the third and seventh segments being 

 smaller than the others ; the fourth segment has also one pair, and the fifth and sixth 

 two pairs of tubercular sharp processes on the sides in front of the spines. Beneath, 



