MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



23 



A note accompanying seven of the specimens reads: "Parasitic in mouths (gill 

 chamber?) of a barracuda-like fish. The male from Nogas Point was taken from the 

 side of a fish (Iniistius). 



This species has been collected before in the Sea of Batavia, in the Indian and 

 Pacific oceans, at Madras, Pulo Penang, Singapore, Java, Bangka, Mabatua, Menado, 

 Bohol, "Marineles, Ubay," Legaspi, the Society Islands, and Japan. It has been 

 found on the tongue of Apolectus niger, and on Psettodis erumei. 



Genus LIVONECA Leach. 

 Livoneca propinqua Richardson. 



Livoneca propinqua Richardson, Proc. U. S. Nat. Mus., xxvn, 1904, p. 37-38; Proc. U. S. Nat. 

 Mus., xxxvn, 1909, p. 87. 



Locality: Station 5111, Sombrero Island, S. 41° E., 4.50 mi. (13° 45' 15" N., 120° 

 46' 30" E.), at a depth of 236 fathoms in green mud. Parasite from macrurid. Sta- 

 tion 5409, Capitancillo Light, N. 19° W., 22 mi. (10° 38' N., 124° 13' 08" E.), at a 

 depth of 189 fathoms in green mud. One specimen from station 5135 I have referred 

 doubtfully to this species. 



Livoneca triangulata, sp. nov. 



Body of adult female oblong-ovate, a little more than twice as long as wide, 5 

 mm. : 11 mm. Color, in alcohol, yellow, with a few scattered black, star-like markings. 

 The terminal, abdominal segment is without markings, except at the base. 



The head is a little wider than long, being 1 mm.: 1.25 mm. It is widely triangular 

 in front. The eyes are large, oval, composite. The first pair of antennae are composed 

 of eight articles and extend two articles beyond the anterolateral angles of the first 

 thoracic segment. The second pair of antennae are also com- 

 posed of eight articles and extend two articles beyond the first slrWrL 

 pair of antennas. f " ' • j> 



The first two segments of the thorax are subequal and each Pt? ' ' ' 



is about 1 mm. long. The following four segments are subequal 1/^ "^yj 



and each is nearly 1.5 mm. in length. The seventh segment is [ .' ,*) 

 the shortest and is only about 0.75 mm. Epimera are present 

 on all the segments except the first and are in 

 the form of narrow plates with extremities 

 rounded, reaching two-thirds the length of 

 the lateral margin of the second segment and 

 half the length of the lateral margin in all the 

 following segments. 



The first five segments of the abdomen are 

 short and subequal , with the lateral parts pro- 

 duced in acute processes. The first segment 

 is the widest and extends a little beyond the seventh leg. x2oy,. /\P 

 sides of the last thoracic segment. The fol- fig. ^.-Livoneca triangulata. x 5. 

 lowing four segments gradually become a little 



narrower. All five segments together only measure a little. over 1 mm. in-length. 

 The sixth or terminal segment is a little wider than long, 2 mm.: 2.^inm., and is 

 posteriorly triangular. The branches of the uropoda are similar, subequal, elongate- 

 oval in shape, and do not reach the extremity of the abdomen. 



All seven pairs of legs are prehensile and have the basis furnished with a moder- 

 ately high carina. 



Three adult females and one young female were collected at Tonimdao Island 

 anchorage, by electric light. Type specimen, catalogue number 40915, LTnited States 

 National Museum. 



