MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



21 



long. The posterior extremity is slightly excavate in the middle. The uropoda do 

 not reach the extremity of the last abdominal segment; both branches are narrow and 

 short, the inner slightly shorter than the outer. 



The legs are all prehensile; there is a carina on the basis of the last four pairs which 

 gradually increases in height; the ischium of these legs is also produced on the inner 

 margin in a wide process. 



About 7 specimens of this species, all females, were collected at Jolo, ship's side, by 

 electric light. 



This species differs from Meinertia trigonocephala (Leach) a and Meinertia oxyrrhyn- 

 chsena (Koelbel)& in the shape of the terminal abdominal segment, the length of the 

 uropoda, the shape of the epimera, and the structure of the legs. It is also a much 

 smaller species than M. trigonocephala. This species is similar to Meinertia huttoni 

 (Filhol).c 



Type specimen, catalogue number 40914, United States National Museum. 



Sur- 



Meinertia parva, sp. nov. 



Body ovate-elongate, a little more than twice as long as wide, 9 mm.: 19 mm. 

 face smooth. Color yellow, marked with numerous brown dots, close together. 



Head, wider than long, 2 mm.: 3 mm., subtriangular in shape, with the front 

 obtuse. Eyes large, composite, distinct, and placed in the postlateral angles; they are 



1 mm. in length, and are separated at their anterior extremities by a distance of 2 mm. 

 The first antennae are short and are not dilated; they are composed of eight articles and 

 extend to the end of the sixth article of the second antennae. 



The second antennae are composed of eleven articles and reach 

 the anterolateral angles of the first thoracic segment. 

 The first five segments of the thorax are subequal, each being 



2 mm. long; the sixth segment is 1.25 mm. in length; the seventh 

 is 1.5 mm. The anterolateral angles of the first segment are pro- 

 duced forward in rounded processes which extend half the length 

 of the head (1 mm.). The epimera of the second and third seg- 

 ments are narrow plates which extend to the postlateral angles 

 of these segments; the epimera of the four 

 following segments extend about two-thirds of 

 the lateral margins and do not reach the pos- 

 terior angles of the segments. 



The abdomen is deeply immersed in the tho- 

 rax. The first two segments are the shortest, 

 and are subequal ; the three following are nearly 

 subequal, and each is almost twice as long as 

 either of the first two. The first segment, 



instead of being narrow as is usual in this genus, has the lateral parts extending as far as 

 those of the following three segments and is fully as wide. The fifth segment, how- 

 ever, has the lateral parts concealed by the preceding segment, which is also unusual 

 in this genus. The sixth or terminal segment is 4 mm. long : 6.5 mm. wide and has 

 the posterior margin widely rounded. The branches of the uropoda are short, oval, 

 the inner one slightly longer and narrower than the outer and both shorter than the 

 terminal abdominal segment, not reaching the extremity of that segment by 1 mm. 



The legs are all prehensile, and there is a carina, which is not very high, on the 

 basis of the last four pairs. 



Only one specimen, a female, was taken, at Opol, Mindanao. Type, catalogue num- 

 ber 40938, United States National Museum. 



Meinertia parva. 



a See Schioedte and Meinert, Nat. Tidssks. (3), xin, 1881-1883, p. 358-364, pi. xvi, fig. 1-2. 

 b Idem., p. 368-371, pi. xvi, fig. 10-13. 



c Ceratothoa huttoni Filhol, Mission de 1' He Campbell, t. in, pt. 2, 1885, p. 446-448, pi. 55, fig. 7, pi. 49, fig. 2. 



