38 



MAKINE ISOPODS FEOM THE PHILIPPINE ISLANDS. 



pleopoda, the branches being leaf -like and elongate, extending a considerable distance 

 beyond the pleural lamellae of the abdomen. The uropoda consist of a pair of elongated 



appendages, attached to the terminal 

 abdominal segment and reaching to the 

 extremity of the branches of the uropoda. 

 The five pairs of incubatory plates over- 

 lap in the median line on the ventral side 

 so as to completely inclose the marsupial 

 cavity. All seven pairs of legs are prehen- 

 sile and have the basis furnished with a 

 high carina. 



The male is narrow, elongate. Head 

 with the anterior margin rounded. Eyes 

 small, distinct. All seven segments of 

 the thorax distinctly separated, with lat- 

 eral margins not contiguous. All six seg- 

 ments of the abdomen distinctly sepa- 

 rated. Last segment small, and with a 

 small, median triangular point on the 

 posterior margin. There are no pleopoda, 

 but on the ventral side of the first five 

 segments is a thickening of the surface on 

 either side of the median line. There are 

 no uropoda. 



One male and one female were collected, 

 at station 5124, Point Origon, S. 56° E., 



20.75 mi. (12° 52 / 00" N., 121° 48' 30" E.), 



Fig. 35.— Pseudione retrorsa. a, Seventh leg of , ,i f OQ1 • „^ 



, , , „ ,, „ ' . 6 at a depth of 281 fathoms, m soft green 



female, X 20£; o, first lamella of marsupium, X r , . 



7J; c, female, X2|; d, male, x 9f. mud - The y were found in the branchial 



cavity of a galatheid. Type specimen, 

 catalogue number 40925, United States National Museum. 



Pseudione incerta, sp. nov. 

 Body asymmetrical, surface smooth. 



Head somewhat bilobate; frontal margin narrow, produced at either side in acute 

 anterolateral angles. Eyes absent. First pair of antennae short, composed of about 

 two or three articles; second pair of antennae com- 

 posed of five or six articles. 



First and second segments of thorax extremely 

 short in the middle of the dorsal surface. First four 

 segments provided with lateral bosses; lateral to these 

 the anterior margin, as well as the posterior margin, 

 is produced in a process or lobe. The last three seg- 

 ments are also each produced in a lateral process. 



All six segments of the abdomen are distinct, with 

 lateral parts not much produced. Each is provided 

 with a pair of double-branched pleopoda, the inner 

 branches being not much smaller than the outer 

 branches in the first three, but exceedingly small in 

 the last two pairs, while the outer branches are as large 

 as those of the first three pairs . The uropoda are a pair 

 of simple elongate lamellae, similar in size and shape to the outer branches of the 

 pleopoda, but differing in the possession of a small acute process on the inner side of 

 the lateral margin near the base. 



Fig. 36.— Pseudione incerta. X 6. 



