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t f 



NOTOSTOMUS WESTERGRENl. 



171 



/ 



maxillipcds are robust ; thej reacli forward far beyond the end of the anten- 

 na! scales ; their terminal segment is triangular in cross section. The first 

 pair of legs are also robust, about equal in length to the third maxillipcds, 

 and their chela is strong, with lingers about equal to the hand in length. 

 The second pair of legs are longer, but much weaker than the first pair, the 

 carpus and propodite much elongated, and the fingers not more than a third 

 as long as the hand. The ischium and merus of both the first and the 

 second pairs are flattened, and the same compression is seen in the three 

 following pairs of legs, which have the form and proportions characteristic 

 of the genus. The inner branches of the swimmerets are about the length 

 of the telson, while the outer branches are rather longer. 



Length, 70 mm.; carapace, 30 mm.; telson, 14 mm.; antennal scale, 

 11 mm. 



Station 3371. 770 fathoms. 1 specimen. 



In this specimen the integument is soft and membranaceous, and the 

 carapace is so collapsed that it is difficult to restore its true outline. In scve- 



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ral respects this species shows an approach to the genus Ilymenodora, as, the 

 soft integument, small eye, and the reduction of the rostrum. 



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Notostomus westergreni Fax. 



Plate F. 



Bull. Mus. Comp. ZooL, XXIV, 208, 1893. 



The rostrum is horizontal and armed on the inferior margin with at least 

 twelve teeth ; the tip is broken off in the unique specimen obtained, but the 

 total length is probably equal to, or a little less than, the antennal scale ; 

 the superior margin is also armed with a series of teeth, which are continued 

 back on the dorsal carina to the posterior margin of the carapace, becoming 

 smaller posteriorly. The dorsal median line of the carapace is nearly hori- 

 zontal from the anterior gastric region to the posterior border of the cara- 

 pace, and but moderately elevated above the level of the rostrum, A carina 

 runs along each side of the rostrum below the superior teeth, and continues 

 backward along the base of the rostrum to the anterior part of the gastric 

 region. The lateral margins of the rostrum are continued backward and 

 downward, forming the upper part of the antero-lateral wall of the carapace 

 above the eye ; they become obsolete just behind the base of the eje-stalk, 

 and are not continuous with the orbital carina. The orbital carina begins 



