202 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



other small particulars, from that which Sars has 

 described under the name "Aristias audouinianus 

 (Sp. Bate)," as also from his A7'istias tumidus 

 (Kroyer), and inferentially also from Aristias neg- 

 lectns, Hansen. In Pararistias cnidouinianus the 

 iirst antennse have the secondary flagellum two- 

 jointed, the jjrimary four-jointed ; the second anten- 

 nae (in the female) have a very short and slender 

 four-jointed flagellum. The mandibles agree very 

 nearly Avith Heller's figure, one of them at least 

 having the singular oblique spine-row in the position 

 from which the molar tubercle more commonly 

 arises ; the other mandible has a single spine near 

 the straight cutting edge ; the second joint of the 

 palji is very elongate and carrying a single spine, 

 the third has three spines and a coating of fine 

 hairs. In the first maxillse the outer plate appears 

 to have only seven spines, which are surrounded by 

 a crowd of hairs ; the palp has only three apical 

 spines, near to which the outer margin is more or 

 less serrate. The second maxillse have about a dozen 

 setae on the broad inner plate, and about half-a- 

 dozen on the narrower outer plate. The peraeopods 

 are remarkable for the almost entire absence of 

 spines, which might be thought a juvenile charac- 

 teristic, but it is found unchanged in an ovigerous 

 female. In all five pairs the antepenultimate joint 

 is very short, in the last three pairs almost com- 

 pletely overlapped behind by the broad and i^ro- 

 duced j)receding joint. All the uropods have the 

 branches fringed on both edges ^vith microscopic 

 spines, except the third pair, in which the outer 

 two-jointed branch is fringed only on the inner 

 margin. 



Spence Bate only knew of the species from Ply- 

 mouth Sound. To the Clyde habitat must be added 

 Liverpool Bay, from which Mr. A. O. Walker has 

 obtained it. Mr. Walker informs me that a new 

 genus Perrierella has just been described by Monsieur 

 Chevreux which is probably identical with Pararis- 



