EUDACTYLINA ACUTA. 127 



one-fourth the length of the cephalothorax ; caudal 

 rami short and broadly ovate. Antennules short, 

 stout, and composed of about five joints, and armed 

 with several strong spines ; a large strongly-curved 

 spine springing from the upper distal angle of the 

 second joint and reaching to near the end of the next 

 joint ; a stout but shorter spine on the lateral aspect 

 of the same joint and also one or two spiniform setas ; 

 a tolerably stout, elongated, and nearly straight spine 

 springing from the upper distal end of the following 

 joint, and immediately below, another, also moderately 

 stout, but only half the length of the first ; the pen- 

 ultimate joint also provided with a short spine, and a 

 few spiniform seta3 at its distal end ; the terminal joint 

 very small. Antennas small, but armed with stout 

 terminal claw-like spines ; also one or two stout spines 

 on the inner aspect of the first and second joints. 

 Mandibles slender, elongated; first maxillipeds small, 

 three-jointed, and furnished with a minute terminal 

 claw. Second maxillipeds of moderate size, each 

 armed with a tolerably powerful, terminal chela which 

 forms an effective grasping-organ, having a somewhat 

 close resemblance to similar appendages in Pseudotanais 

 — a genus belonging to Isopoda-Chelifera. 



The first four pairs of thoracic legs all biramose ; in 

 the first, third, and fourth pairs both the inner and 

 outer ramus distinctly three-jointed ; in the second 

 pair the inner ramus composed of three subequal 

 joints, but the outer somewhat abnormal in structure, 

 the first joint comparatively large and fully as long as 

 the entire inner ramus, while the distal extremity 

 appears to consist of two minute coalescent joints; 

 the basiopodite in all the four pairs composed of two 

 unequal joints, the second being the smaller; the 

 inner margin of the second basal joint in the first pair 

 fringed with about five very short but stout spinules ; 

 the first and second joints of the outer ramus each 

 with a small dagger-shaped spine on the outer distal 

 angle, and the third joint with two similar spines and 



