f. THE ISOPODS 5^7 



both together as long as the first joint. The second pair of antennas do 

 not quite reach the end of the second joint of the first pair. 



The thoracic segments are similar 

 to those of the male. 



The abdomen and the uropods are 

 also similar to those of the male. 



The gnathopods have the hand 

 strongly chelate, but very much smaller 

 than the hand of the male, the finger 

 and thumb not gaping. The pereio- 

 pods are all alike and of equal 

 length. 



Color of specimens white with 

 more or less numerous markings of F^«- ^o- T.^"^is stanfordi. a. 



Head of female. /^. Hand of female, 

 brow^n. 



A number of specimens of both males and females were found at 

 Clipperton Island Lagoon. 



Type, U. S. National Museum. Cat. No. 25172. 



Family CYMOTHOID^. 

 ^GATHOA EXCISA sp. nov. 



Description. — Body narrow, elongate, three and a half times longer 

 than broad. 



Head quadrangular, the front produced over and beyond the basal 

 joints of the antennae, the anterior margin of which is deeply ex- 

 cavate, the lateral margins rounded. Eyes large, oc- 

 cupying the greater part of the area of the head, but not 

 contiguous. The first pair of antennas extend a little be- 

 yond the posterior margin of the head, and are composed 

 of eight joints. The second pair of antennae are equal in 

 length to the first pair, and are composed of about four- 

 teen joints. 



The first and fifth thoracic segments are somewhat longer 

 than any of the others. The epimera are short, not reach- 

 ing beyond the posterior angles of their respective seg- 

 ments, but all equalling these segments in length. 

 Fig. 61. All of the first five abdominal segments are distinct and 

 ^^gathoa subequal; terminal segment is about equal in length to the 

 excisa. ^^g preceding ones, is triangularly shaped, with rounded 



extremity, and has a lateral incision on each side near the posterior 



