32 MAKINE ISOPODS FKOM THE PHILIPPINE ISLANDS. 



two articles of the peduncle of the second antennae are short and subequal, the first 

 being almost wholly concealed, the second armed with one long spine at its extremity; 

 the third article is elongate and armed with six or eight spines; the fourth article 



is longer than the preceding and is armed with a 

 series of four or six spines and a spine at the distal 

 extremity; the fifth article is longer than the pre- 

 ceding one and is unarmed. The flagellum is 

 broken. 



All the segments of the thorax are armed each 

 with a transverse row of four long spines, two on 

 either side of the median line. All, except the 

 first, have a long spine on either side close to the 

 lateral margin, near the epimeron. The fourth 

 segment also has one postlateral spine on either 

 side and the fifth segment has two anterolateral 

 spines and one postlateral spine. The total num- 

 ber of spines on the first segment is four; the total 

 number of spines on the second, third, sixth, and 

 seventh segments is six; the total number on the 

 fourth segment is eight, and the total number on 

 the fifth segment is twelve. The lateral margin 

 of the head has two small spines on either side ; the 

 lateral margin of the first thoracic segment has 

 three small spines. Each epimeron is produced 

 in one or two small spines. 



The first two free segments of the abdomen are 

 furnished each with four spines in a transverse 

 row, two on either side of the median line. The 

 third segment is fused with the terminal segment, 

 and also has four spines in a transverse row, two 

 on either side of the median line, the lateral 

 spines being very long. The last or terminal seg- 

 ment has eight spines on the dorsal surface, four 

 on either side of the median line, and four spines 

 on the lateral margins, two on either side below 

 the transverse median line. The abdomen ends 

 in an obtuse point. Just above this obtuse point 

 is a long posteriorly directed spine on the .dorsal surface. 

 The legs are also covered with spines. 



Only one specimen was obtained, at station 5636, Pitt Passage, Gomomo Island, at 

 a depth of 1,262 fathoms. Type, catalogue number 41016, United States National 

 Museum. 



Fig. 29.— Arcturus parvus. X6f. 



Arcturus hirsutus Richardson. 



Arcturus hirsutus Richardson, Proc. U. S. Nat. Mus., vol. 27, 1904, p. 41-43; Proc. U S. Nat. 

 Mus., vol. 37, 1909, p. 97-98. 



Locality: Station 5605, Gulf of Tomini, Celebes, Dodepo Island, at a depth of 647 

 fathoms; one specimen, which I have doubtfully referred to this species. 



Arcturus myops Beddard. 



Arcturus myops Beddard, Proc. Zool. Soc. Lond., 1886, pt. 1, p. 106; Challenger Report, Zool., vol. 17, 

 pt. 48, 1886, p. 100, pi. xxn, fig. 5-8, pi. XXV, fig. 8. 



Locality: Station 5664, Macassar Strait, Kapoposang Light, at a depth of 400 

 fathoms. Beddard's specimens were from off New Zealand. 



