326 Mr. H. D. S. Goodsir on new species of Crustaceans. 



jointed. Eye situated behind the rostrum, rhomboid, transverse. 

 Posterior pair of legs showing only one joint from the posterior 

 and lateral edge of the body, armed on the lateral edges with 

 strong spines, the two terminal spines being strongest. 



Description. — Body ovoid, rather dilated, anteriorly quite 

 smooth. The anterior segment of the body as large as the 

 whole of the remaining segments, and having the lateral edges 

 surrounded with a narrow border. This animal is very active and 

 swims about with great rapidity. It is exceedingly minute, not 

 being larger than a mere point. 



Sterope armatus. Plate XI. fig. 9. 

 Rostrum very prominent, rounded, and one-third the whole 

 breadth of the body ; antennae six-jointed, and armed at the ex- 

 tremity and on the anterior edge with a series of robust long 

 spines. Eye not apparent. 



Carrillus oblongus. Plate XI. fig. 13. 

 Rostrum one-eighth the breadth of the whole body, prominent, 

 rounded at the extremity, with the eye very small, and situated 

 almost upon the anterior edge ; anterior edge of body hollowed 

 out on either side of the rostrum. Antennse clavate and eight- 

 jointed, very little longer than half the breadth of the body, un- 

 armed, last joint pointed. Abdominal legs delicate, and armed 

 at the extremities only with one or more spines. Abdominal 

 segments of body taper gradually. 



Sterope interruptus. Plate XI. fig. 10. 

 Rostrum prominent, one-tenth the breadth of the whole body, 

 pointed. Eye large, and filling almost the whole of the rostrum. 

 Anterior edge of the body hollowed out on either side of the 

 rostrum. Posterior thoracic legs strong, spined, and serrated on 

 the external edges. Three strong short spines arise from each 

 side of the abdominal portion of the body, and a strong pedicle 

 armed with three spines arises from the posterior edge of the 

 last abdominal segment on each side of the mesial line. 



Zaus spinatus. Plate XL fig. 1. 

 Antennse three-jointed. A spine arises from the anterior edge 

 of the carapace on each side of the mesial line, one from the base 

 of each of the antennse. Abdominal pedicles three-jointed, distal 

 one armed at its extremity with three robust strong spines, the 

 central ones longest. 



EXPLANATION OF PLATE XL 

 Fig. 1. Zaus spinatus, magnified. 

 Figs. 2, 4, 5, 7, 8. Organs of locomotion. 

 Fig. 6. One of the first antennas. 



