492 



THE VOYAGE OF H.M.S. CHALLENGER. 



ridge, which is but imperfectly developed, and one on the hepatic region. The pleon is 

 smooth and the caudal appendages are long. 



Length, entire, 



„ of carapace, 

 Breadth between hepatic teeth, 

 Length of rostrum, 



,, of pleon, 



„ of third somite, 



„ of sixth somite, 



„ of telson, 



,, of scaphocerite, 



„ of first pereiopod, 



„ of second pereiopod, 



„ of third pereiopod, 



„ of fourth pereiopod, 



,, of fifth pereiopod, 



Habitat.— Station 200, October 23, 1874 ; lat. 6° 47' N., long. 122° 28' E.; between 

 the Philippines and Borneo ; depth, 250 fathoms ; bottom, green mud. One specimen, 

 female. Trawled. 



This species looks very like Pontopliilus gracilis, but it 

 has but one tooth on the gastric region. The rostrum 

 ophthalmopoda, and has no small denticles on each side 

 teeth on the carapace, one on the gastric region, one on the 

 the hepatic, and one near the centre of the lateral wall 

 somite is scarcely so long as in Pontophilus gracilis, but 

 and the appendages generally have a slender appearance, 

 third pairs of pereiopocla. 



It may be distinguished from Pontophilus pro 'fundus by 

 of the third somite of the pleon not being produced so as to 



is only half the length and 



is sharp, longer than the 



of its base. There are six 



cardiac, one on each side on 



of the carapace. The sixth 



the telson is quite as long, 



particularly the second and 



the posterior dorsal surface 

 almost cover the fourth. 



Sabinea, Owen. 



Sabinea, Owen, Appendix to Eoss's Narrative of a Second Voyage in Search of a North-West 

 Passage, p. lxxxii, 1835. 



Carapace about one-fourth the length of the animal, dorsally flattened and laterally 

 compressed, anteriorly produced to a rostrum that is scarcely longer than the 

 ophthalmopoda. 



Pleon dorsally interruptedly carinated on the second, third, and fourth somites only. 



Telson long and tapering. 



Ophthalmopoda short and orbicular. 



