76 Bulletin Vanderbilt Marine Museum, Vol. VI 



ness of the rostrum and vanishes anteriorly beyond the spines 

 toward the apex. The inferior rostral margin is devoid of spines 

 but is setae-fringed above the orbit. There is also a short fringe of 

 setae on the upper margin between the spines. The rostral form- 

 ula, in the twelve specimens from New Caledonia, is from six 

 to nine teeth on the superior margin, none on the inferior margin. 

 The carapace has the antennal spine strong, continued backward as 

 a ridge, accompanied on the upper side by a wide antennal sulcus, 

 the upper border of which is a less strong parallel ridge, running 

 to the orbital angle. The orbital spine is apparently obsolete in a 

 lateral view but is represented in a dorsal view as the slightly 

 angled apex of that fold of carapace forming the orbital ridge. It 

 is not a true spine, developed in degree comparable to that of the 

 antennal and hepatic spines. The fact that it occurs immediately 

 above the base of the ophthalmic stalk, which would rub back 

 upon this orbital or angle spine, when the eye is elevated, may 

 in part account for the varying degree of development or ab- 

 sence of an orbital spine, recorded by different writers. The 

 twelve New Caledonia specimens have about the same degree of 

 development of this orbital angle. Posteriorly the antennal sulcus 

 deepens beneath the hepatic spine and is tomentose here and con- 

 fluent with the strong cervical sulcus, and also with a strong sinu- 

 ate subhepatic sulcus that runs back below the hepatic spine 

 about as far as does the cervical groove above it and this sub- 

 hepatic sulcus continues forward and below the hepatic spine to 

 the frontal margin of the carapace, just above the rounded antero- 

 lateral angle. The hepatic spine is about as strong as the antennal 

 spine. The ridge curving obliquely upward and backward from 

 the hepatic spine and defining the lower margin of the cervical 

 suture is fringed with short setae. There is also a short oblique 

 sulcus on the upper part of the carapace, just below the rostral 

 lateral ridge and slightly posterior to the first proximal rostral 

 spine. There is a fine pilosity on the posterior sulcus of the rostral 

 ridge and in some other areas of the median lateral carapace. 



The abdomen is moderately compressed, the fourth segment 

 is inclined to a definite median longitudinal carina on the posterior 

 two-fifths. The fifth and sixth segments are carinate throughout 

 their length, the latter terminating in a small distal tooth. The 

 sixth segment is four-fifths as long as the telson. The telson is 

 four-fifths as long as the greatest length of the uropoda and is 



