182 Miss H. Richardson on the Isopods of the 



pair of antennae, with a flagellum of thirteen articles, extend 

 to the middle of the fourth tlioracic segment, and exceed by 



Fig. 15. 



Tecticeps convexus. 

 a, head, x 6i ; b, abdomen and last thoracic segment, x 2§. 



one joint the length of the first pair of antennae. Both pairs 

 of antennae are disposed to lie concealed under the broad 

 epimeral plates of the thoracic segments. 



The thoracic segments are subequal in length. The first 

 segment has its antero-lateral angles produced around the 

 anterior portion of the head, forming a broad phite at the 

 side of the segment. The epimera are almost twice as broad 

 as long ; those of the fifth segment extend downward, with 

 the anterior margin straight, making the length and breadth 

 about equal, and forming almost square epimera ; in the 

 epimera of the sixth and seventh segments the anterior 

 margins are in tlie same direction as the posterior margins, 

 which extend downward. 



The first segment of the abdomen has three suture-lines, 

 and its posterior margin is produced in two small points, one 

 on either side of the median line, about equidistant from it 

 and the lateral margin of the segment. The terminal seg- 

 ment is widely rounded posteriorly. The inner branch of the 

 uropoda is of nearly equal width throughout its length and 

 is rounded at its extremity ; the outer branch is slender and 

 sharply pointed. Both branches are of nearly equal length 

 and neitlier extends beyond the tip of the abdomen. 



The first pair of legs have the propodus dilated and the 

 dactylus reflexible. The propodus is large and oval in shape. 

 ]n the legs of the second pair the propodus is irregular in 

 shape, sometimes dilated with reflexible dactylus, and some- 

 times simple. The legs of the other five pairs are similar in 

 structure, ambulatory, and show a gradual increase in length. 



A number of individuals were found at Monterey Bay, 

 California, and sent to the U.S. National Museum by 

 Mr. Heath, who gives the following notes of their habits : — 



" They were taken by the Chinese fishermen from a sandy 

 sea-bottom about 30 feet below the surface (according to the 

 Chinese statement). These are rapid swimmers, and the 



