MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



19 



upward, so that the dorsal surface is extremely concave. The inner branches of the 

 uropoda extend to the tip of the abdomen. The peduncle is 3 mm. long and the 

 inner branch 6 mm. The outer branch is 5 mm. long and is also narrower than the 

 inner branch. Both branches are acute posteriorly, the outer branch being slightly 

 more acute than the inner branch. 



The first four pairs of legs are short and have the dactylus inflated in the center. 

 The last three pairs gradually increase in length; there is no carina on the bases of any 

 of the legs. 



This species is very close to Anilocra longicauda Schicedte and Meinert a from 

 Singapore but differs in the longer terminal abdominal segment, which is also differ- 

 ently shaped and concave; in the longer uropoda, the outer branch being shorter, and 

 both being narrower and more acute. 



Only one specimen, a female, was taken at Paudanon Island. Type, catalogue 

 number 40936, United States National Museum. 



Genus LOBOTHORAX Bleeker 1857. 



Synonym, Saophra Schioedte and Meinert. 



Lobothorax laevis, sp. no v. 



Body ovate, a little more than twice as long as wide, 8.5 mm.: 20 mm. The thorax 

 gradually widens from the first segment, which is 5.5 mm., to the fifth segment, which 

 is 8.5 mm. wide. The surface of the body is perfectly smooth. Color yellow, marked 

 with numerous small, black, irregularly shaped dots. 



The head is wider posteriorly than anteriorly, being 2.5 mm. wide posteriorly and 

 gradually narrowing to a truncate anterior, which is 1.5 mm. wide. In length the 

 head is 2 mm. The eyes are large, distinct, composite; they 

 are situated in the postlateral angles and extend half the length 

 of the lateral margin, being 1 mm. long and 1 mm. wide, and 

 separated by a distance of only 0.5 mm. from each other. The 

 first pair of antennae are composed of eight articles, the three 

 first being large and dilated; they extend beyond the posterior 

 margin of the head by the last three articles. The second pair of 

 antenna? are composed of nine articles and are equal in length 

 to the first pair of antenna?. 



The first segment of the thorax has the antero- 

 lateral angles produced in a horn-like process on 

 either side, surrounding the head, and extending 

 along its lateral margins to a point halfway be- 

 tween the eyes and the frontal margin. The first 

 four segments are the longest, each being 3 mm. in 

 length, with the exception of the second, which 

 is 2.5 mm. The last three are conspicuously 

 smaller and gradually decrease in length, the fifth 

 being 1.5 mm. long, the sixth 1 mm., and the 

 seventh 0.5 mm. in length. The fifth segment is the widest and the thorax grad- 

 ually becomes narrower to the seventh segment, which is 6.5 mm. wide. The epi- 

 mera are narrow plates which do not reach the posterior margins of the segments. 



The abdomen is deeply immersed in the thorax. The first five segments together 

 are equal to 3 mm., the last two being slightly longer than the first three. The first 

 two have the lateral parts covered by the seventh thoracic segment. The sixth or 

 terminal segment is 3.5 mm. long and 5.5 mm. wide. It is rounded posteriorly, with 



Seventh leg. 

 Fig. 18.— Lobothorax laevis. X 2§. 



a Nat. Tidsskr. (3), xm, 1881-1883, p. 113-116, pi. vm, fig. 7-8. 



