6 



MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



The female differs from the male in not having conspicuously produced epimera 

 and in not having the segments of the thorax and abdomen fringed with hairs. 



Three specimens, two males and one female, were collected at station 5664, Macas- 

 sar Strait, Kapoposang Light, at a depth of 400 fathoms. Type specimen, catalogue 

 number 41022, United States National Museum. 

 Cirolana excisa, sp. nov. 



Body ovate, about twice as long as wide, 4 mm.: 8.5 mm. Surface smooth. Color 

 yellow, marked with numerous black arborescent marks. 



Head wider than long, 1 mm.: 2 mm., with the anterior margin rounded and pro- 

 duced in a small median point. Eyes small, black, composite, round, 0.5 mm.: 0.5 

 mm., separated by a distance of 1 mm. and situated in the lateral angles. The first 

 pair of antennae have the first two articles of the peduncle 

 short and subequal; the third article is as long as the first 

 two taken together. The flagellum, composed of sixteen 

 articles, extends a little beyond the peduncle of the second 

 antennae. The second antennae have the first three articles 

 of the peduncle short and subequal; the last two are subequal 

 and each is about as long as the first three taken together. 

 The flagellum, composed of about thirty-three articles, ex- 

 tends to the postlateral angle of the fourth thoracic segment. 

 The frontal lamina is short and broad, about twice as 

 long as wide. 



The first segment of the thorax is a little longer than any 

 of those following; the last two are slightly shorter than any 

 of the preceding segments. Epimera are present on all the 

 segments except the first, and do not extend beyond the 

 postlateral angles of the segments except those of the last 

 two, which are acutely produced. 

 The first segment of the abdomen is not visible; the second is almost entirely con- 

 cealed; the three following are subequal in length, with the lateral angles of the third 

 and fourth segments reaching those of the fifth segment. The sixth or terminal seg- 

 ment is a little wider than long, 2 mm. : 2.5 mm., and is broadly rounded posteriorly, 

 with the posterior margin furnish- 

 ed with seven teeth, and about 

 eight spines. The inner branch 

 of the uropoda is broad and longer 

 than the terminal abdominal seg- 

 ment; it is obliquely truncate with 

 the outer, postlateral angle pro- 

 duced, the posterior margin fur- 

 nished with five teeth and the 

 outer margin incised, with two 

 teeth within the incision. The 

 outer branch is narrow, and pro- 

 duced to an acute extremity end- 

 ing in two teeth, both margins 

 being dentate. The uropods and the terminal abdominal segment are fringed with 

 hairs on the margins. 



The first three pairs'of legs are short, the last four pairs long, and all are spinulose. 

 Three specimens were collected at station 5554, Jolo Island and vicinity, Cabalian 

 Point (Jolo), at a depth of 25 fathoms. Type, catalogue number 41012, United States 

 National Museum. 



This species is similar to Cirolana japonica Hansen,« but differs in the form of the 

 inner branch of the uropoda and in the form of the second maxillae. 



a Vidensk. Selsk. Skr. (6), v, pt 3, 1890, p. 349-351, pi. iv, fig. 2 a-1. 



Fig. 4.— Cirolana excisa. 

 X 6. 



Fig. 5.— Cirolana excisa. a, First maxilla (outer lobe); 

 b, first maxilla (inner lobe); c, second maxilla; d, max- 

 illiped. X 77i. 



