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groove by which the antennal and the gastric region are separated from one another and 

 which is a continuation of the longitudinal groove on the sides of the rostrum, is rather deep 

 but does not reach farther backward and downward than the line uniting the antennal spine 

 with the fourth spine described above. A shallow impression is seen between the orbital and 

 gastric regions. The sinuous submarginal ridge of the carapace is prominent and conspicuous. 



The i^' — 3"' abdominal somites are rounded, the 4''' — 6''^ are sharply carinate and their 

 carinae terminate in a small tooth ; rarely the 3"! tergum shows obscure traces of a partial 

 carination, especially posteriorly. The 3"^ abdominal somite is a little longer than the 2"^ ; the 

 6^^ somite, almost one and a half as long as the 5'^, is but one-fifth longer than high and 

 strongly compressed, being just half as thick as high. Telson little (about one-sixth) longer 

 than the 6"^ somite, with shallow dorsal and lateral grooves and with one pair of small, acute 

 immovable spines just near the spiniform tip. Abdominal pleura rounded posteriorly, those of 

 the 6"i somite with an extremely small, acute tooth at the posterior end of the arcuate lower 

 margin. Inner uropod lanceolate, a little more than 3-times as long as broad, extending with 

 one-third or one-fourth its length beyond the tip of the telson; the outer uropod which is 4-times 

 as long as broad and obtusely pointed at the tip, surpasses the inner as far as the latter does 

 reach beyond the telson. 



Eyes large, reniform, black, the major diameter of the cornea twice as broad as the 

 peduncle; the eyes are flattened above and carry a minute tubercle at the inner side. 



First joint of antennular peduncle a litde longer than half its length; its outer border 

 is deeply notched at the base by a small, narrow incision, just near the antennal spine of the 

 carapace, and terminates at the far end in a small spine; usually a still smaller spine, followed 

 by a very small incision, occurs on the outer margin, about in the middle, somewhat nearer to 

 the basal incision as to the far end, but in other specimens this small spine (the stylocerite) 

 and this incision are indi.stinct. The hairy lamelliform appendage, the prosarthema, is usually 

 a little shorter than the eyes, that part which is visible from above, is narrow, pointed, with a 

 .sharp, arcuate, outer margin. The three-sided 2°<^ article is less than half as long as the i^' and 

 very hairy, the 3"^ is somewhat shorter than the 2°^. The two flagella are filiform, both, as 

 in Halip. diouicdeae, considerably longer than the body and probably of equal or 

 subequal length: so e.g. in a male, long 155 mm., the upper flagellum is i So mm. long, the 

 lower (not complete) 150 mm.; in an adult female, long 175 mm., the lower flagellum measured 

 190 mm., in another female, long 145 mm., the upper 175 mm. The upper flagellum is thinner 

 than the other; a proximal portion is slightly broadened and compressed, this broadened portion 

 consists of 25 or 26 joints and is a little more than half as long as the peduncle; it is 14 mm. 

 long in a male, the upper flagellum of which is i So mm. long and the peduncle 22 mm. 

 The lower margin of this broadened part is hairy at the outer side. The lower flagellum is 

 thicker at the base than the other, but it tapers rapidly; at the lower side of the base one 

 observes long, olfactory hairs. 



Basal joint of outer antennae with a small spine at the outer angle, the peduncle is a 

 little shorter than the eyes and the flagellum is very long, 3-times as long as the body: so 

 e.g. in a female, long 146mm., this flagellum measured 450mm. The scaphocerite that exceeds 



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