24 



MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



This species is similar to Livoneca indica H. Milne Edwards, « but differs in the size 

 of the species, the present one being much smaller than L. indica; in the shape of 

 the terminal abdominal segment and in the size of the first two epimera. 



Livoneca philippinensis, sp. no v. 



Body oblong-ovate, twisted a little to the right, nearly twice as long as wide, 8.5 

 mm.: 16 mm. Color, in alcohol, yellow. 



Head wider than long, 1.5 mm.: 2 mm., with the anterior margin widely rounded. 

 Eyes small, round, and situated in the postlateral angles. The first pair of antennae 

 are composed of six articles and extend two articles beyond the anterolateral angles 

 of the first thoracic segment . The second pair of antennae are composed of seven articles 

 and are not longer than the first antennae. 



The first, third, and sixth segments of the thorax are subequal in length and each 

 is 1.5 mm. long; the second and seventh segments are subequal and each is 1 mm. long, 

 the second segment being just a little more than 1 mm.; 

 the fourth and fifth segments are each 2 mm. in length. 

 Epimera are present on all the segments except the first, in 

 the form of long, narrow plates, which reach the postlateral 

 angles of the segments in the second, third, and seventh 

 segments. Those of the fourth segment extend a little 

 more than one-half of the lateral margin; those of the fifth 

 segment two-thirds of the lateral margin, and those of 

 the sixth segment three- fourths of the lateral margin. 



The first five segments of the abdo- 

 men are short and subequal, and all 

 together are but little over 2 mm. in 

 length. The sixth or terminal seg- 

 ment is a little wider than long, being 

 3.5 mm.: 4.5 mm., and has the poste- 

 rior margin triangularly rounded . The 

 branches of the uropoda are short, 



Seventh leg. Xllfe. ... . , j j . r 



...... similar, subequal, and do not reach 



Fig. 23. — Livoneca philippinensis. X3j?. . . , , . , i 



the tip of the terminal segment; they 



are oblong-oval in shape. The seven pairs of legs are prehensile. The basis of the 



last four pahs is furnished with a low carina. 



Only one specimen, a female, was collected, at station 5143, Jolo Light, S. 50° W., 

 3.40 mi. (6° 05' 50" N., 121° 02 7 15" E.), at a depth of 19 fathoms in coral and sand. 

 Type, catalogue number 40916, United States National Museum. 



This species is similar to L. lunelii Haller,& but differs in the shape of the terminal 

 abdominal segment, the longer uropoda, and the smaller size. It is also similar to 

 L. sinuata Koelbel, c from the Mediterranean. 



Livoneca frontalis, sp. nov. 



Body ovate, twisted a little to one side, a little more than twice as long as wide, 

 9.5 mm.: 20 mm. Surface smooth. Color yellow, with a few black dots on the head 

 and on the lateral margins of the thorax. 



Head triangular in shape, 2 mm. long :2.5 mm. wide at the base, with the front 

 produced in an obtuse extremity. The eyes are small, distinct, black, composite, 

 and placed in the postlateral angles. They are about 1 mm. long by 0.5 mm. wide 

 and are separated by a distance of 1.5 mm. The first antennae are composed of eight 



a Hist. Nat. Crust., in, 1840, p. 262. Schioedte and Meinert, Nat. Tidsskr. (3) xiv, 1883-84, p. 362-365, 

 pi. xv, fig. 3-5. 



&Archiv fur Natur-geschichte, I, 46th year, 1880, p. 393, pi. xvm, fig. 11. 



c See Schioedte and Meinert, Nat. Tidsskr. (3), xiv, 1883-84, p. 378-381, pi. xvi,fig. 7-8. 



