MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



7 



Oirolana curt a, sp. nov. 



Body oblong-ovate, three times longer than wide, 6 mm. : 18 mm. Surface smooth. 

 Color yellow, marked with numerous black marks, close together; uropods and abdo- 

 men yellow, with black marks only at the base. 



Head wider than long, 1.5 mm.: 3.5 mm., with the anterior margin produced in 

 a small median point, on either side of which is a small excavation. Eyes large, 

 quadrate, about as wide as long, 1 mm.:l mm., composite, situated in the antero- 

 lateral angles and separated by a distance of 1.5 mm. at the anterior extremity. The 

 first pair of antennae have the first two articles of the peduncle short and sub -equal; 

 the third is a little longer than the first two taken together, and extends to the end of 

 the third article of the peduncle of the second antennas. The flagellum, composed 

 of fourteen short articles, extends to the end of the fourth article of the peduncle 

 of the second antennae. The first two articles of the peduncle of the second antennse 

 are short and subequal; the third and fourth are subequal 

 and each is a little longer than the first two taken together; 

 the fifth is about 1.5 times the length of the preceding 

 article; the flagellum, composed of nineteen articles, ex- 

 tends to the postlateral angles of the second thoracic seg- 

 ment. The frontal lamina or interantennal plate is long 

 and narrow. 



The first segment of the thorax is twice as long as the sec- 

 ond, being 2 mm. in length; the last five segments are 

 subequal, each being 1.5 mm. long. All except the first 

 are furnished with wide epimera, those of the second and 

 third segments not produced beyond 

 the posterior margin of the segments, 

 while those of the last four are but 

 little produced. All are crossed by 

 a transversely oblique carina. 



The first five segments of the abdo- 

 men are short, the first being partly 

 covered by the seventh thoracic seg- 

 ment; the second, third, and fourth 

 are 0.5 mm. long, the fifth being 

 about 0.75 mm. The sixth or termi- 

 nal segment is a little wider than 

 long, 3 mm. : 4 mm., and is widely rounded posteriorly. The inner branch of the uro- 

 poda is very wide and long, and extends 0.5 mm. beyond the tip of the abdomen; 

 it is widely rounded posteriorly. The outer branch is short and narrow, about 0.75 

 mm. shorter than the inner branch and about one-third as wide; it is posteriorly 

 rounded. Both branches and the terminal abdominal segment are fringed with long 

 hairs and furnished with a few spines. 



The legs are furnished with spines and hairs; those of the last four pairs have the 

 basis very much enlarged and fringed with extremely long hairs, especially the 

 seventh pair. 



Only one specimen, the type, was obtained, at station 5565, between Jolo and 

 Tawi Tawi, Dammi Island, at a depth of 242 fathoms. Catalogue number 41013, 

 United States National Museum. 



This species differs from Cirolana schiddtei Miers a in the form of the frontal lamina 

 and the shape of the abdomen and uropoda. It also differs from C. tenuistylis Miers a 

 in the form of the abdomen and uropoda. It differs from Cirolana rossii Miers & 

 in the shape of the eyes and of the uropoda. It is also different from C. japonica 

 Richardson and C. lata Haswell. 



Seventh leg. X 7#. 



Fig. 6 —Cirolana eurta. X 4%. 



a Zoological collections of the Alert, 1884, p. 302, 304, pi. xxxm, fig. A. B. 

 t> Catalogue of the Stalk and Sessile-eyed Crustacea of New Zealand, 187G, p. 109, pi. m, fig. 3. 

 55841°— 10 2 



