MUSEUM OF COMPARATIVE ZOOLOGY. 219 



carapace behind tlie base of the rostrum ; the caudal limbs are simple in the 

 male. 



Length, 31 mm. 



Station 2637 Hydr. 700 fathoms. 1 male. 



SCOLOPHTHALMUS. gen. nov 



Carapace rostrate, small, covering only the anterior part of the thorax, leav- 

 ing the last two thoracic segments exposed. Abdomen slender, cylindrical, 

 sixth segment the longest. Eyestalks transformed to sharp spines, visual ele- 

 ments wanting. Antennular peduncle rather long and robust. Antennal scale 

 elongate, oval ; proximal fourth of outer edge smooth, naked, terminating in 

 an angle which bears a strong seta ; the rest of the outer edge fringed with 

 hairs like the inner edge. Mandibular palpi reaching to about the middle of 

 the antennulary flagellum, terminal segment narrowly oblong. Second max- 

 illse with inner basal part expanded, three-lobed, terminal segment expanded 

 at distal end, triangular. First maxillipeds without an exopod, but furnished 

 ■ with a well developed epipod. Second maxillipeds of moderate length, sub- 

 pediform. Legs long and slender, antepenultimate pair reaching forward 

 beyond the base of the antennal scale. Marsupial pouch of the female com- 

 posed of seven pairs of incubatory lamellae. Telson large, apex truncate, not 

 incised. Outer plates of the swimmerets (uropods) not divided by a transverse 

 suture. 



Scolophthalmus lucifugus, sp. nov. 



Frontal margin of carapace produced so as to form an acute rostrum ; antero- 

 lateral margins oblique, armed with two spines, one behind the external margin 

 of the antennule, the other at the anterior inferior angle. Cervical sulcus 

 well marked, with a distinct linguiform dorsal area behind it. Posterior lat- 

 eral wings short and rounded. Abdominal segments smooth and cylindrical, 

 sixth segment nearly as long as the two antecedent segments combined. Telson 

 broad, truncate. Eyes atrophied, their peduncles assuming the form of spines. 

 Antennal peduncles one half as long as the carapace, second and third segments 

 about equal in length, a little longer than the first, the third slenderer than 

 the first and second ; the flagella are equal to or rather longer than the pedun- 

 cle, and present a uniform structure of small articulations, the basal part of the 

 outer flagellum not being expanded. The antennal scale and mandibular palpi 

 are described in the generic diagnosis ; the antennal scale is equal in length to 

 the antennular flagellum. Abdominal limbs (of the female) simple, increasing 

 in length posteriorly, the fifth pair distinctly two-jointed. Inner branch of 

 uropods slender, lanceolate, surpassing the telson and the outer branch, the 

 latter of which is oval and divided by transverse suture. 



Length, 42 mm. 



Station 3400. 1322 fathoms. 1 female. 



