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(in: Bull. Mus. Ocean. Monaco, 1906, p. 81) by the existence of a small, though functional 

 arthrobranchia on the VII"' somite. The exopods of the 2"<^ and 3'''' maxillipeds and of all the 

 thoracic legs are quite rudimentary, being 0,75—1 mm. long, and may easily be overlooked. 



13. Halipo}-iis Litcasii (Sp. Bate). 



Soh'iiocera Lucasii C. Spence Bate, in: Ann. Mag. Nat. Hist. (5) Vol. 8, 188 1, p. 185. 

 Philonicus Lucasii C. Spence Bate, Report Challenger Macrura, 1S88, p. 277, PI. XLII, Fig. 4. 

 Nee: Solenocera lucasii E. J. Miers, in: Proc. Zool. Soc. London, 1884, p. 15. 

 Nee: Solenocera lucasii M. J. Rathbun, in: U. S. Fish Commission Bull, for 1903, PI. Ill, Wash. 

 1906, p. 904, PI. XX, Fig. 9. 



Stat. 65\ May 6. Near Tanah Djampeah. From 400 m. upward to 120 m. Pale, grey mud, 

 changing during haul into coral bottom, i young male. 



Stat. 159. August 16. o°59'.iS., I29°48'.8 E. Halmaheira Sea. 411 m. Coarse sand, i very 

 young specimen. 



The male from .Stat. 65=^ is 66 mm. long, the carapace, rostrum included, being 18 mm. 

 long, without the rostrum 13,3 mm.; the female that hitherto was known alone, attains, however, 

 a length of 100 mm. The rostrum, which is quite horizontal, reaches the far end of i^' anten- 

 nular article, just exceeding the eyes. Of the 7 teeth four are situated on the carapace ; the 

 teeth are nearly equidistant, the 2°<i being not so far distant from the i^^ as in B.\te's figure. 

 The rostral crest is produced until to the cervical groove, behind the groove the carapace 

 is rounded. Anteriorly near the rostral crest and between the lateral spines the carapace is 

 somewhat pubescent, but posterior to the cervical groove it seems to be glabrous. Antennal 

 spine small, just behind it and nearly in the same horizontal line, another somewhat larger 

 spine, the post-orbital ; the distance between the tips of these two spines is hardly one-fourth the 

 interspace between the tip of the post- orbital spine and the cervical groove. The branchiostegal 

 spine, about i mm. distant from the rounded, antero-lateral angle of the carapace, has the same 

 size as the post-orbital, the hejjatic spine is smaller. The cervical groove is deep and distinct 

 up to the gastric carina; just below the hepatic spine runs a short, also rather deep, transverse 

 groove (S. hepaticus Stimpson), that anteriorly meets the cervical groove, while it extends 

 backward hardly beyond the level of the i^' tooth of the rostrum. The abdomen is carinate 

 from the 3"^ somite backward, the carina of the. 3''^ somite is, however, less sharp than that 

 of the three following somites. Spence Bate describes the telson of his single specimen, a 

 female, as truncate, but the pointed extremity was no doubt broken off. In the specimen from 

 Stat. 65^ the telson tapers to a point and is almost 1,5 mm. shorter than the inner uropod, 

 while the inner uropod is just as much shorter as the outer, to the terminal third of which 

 the telson reaches ; the telson is broadly grooved from its base to the level of the lateral spines 

 that are observed at one-third of its length from the tip. As in Trachypeiiaeus curvirostris 

 (Stimps.), the pleura of the i^' abdominal somite bear a short fissure, that runs from the lower 

 margin upward, a little behind the middle. 



Though the eyes are of moderate size, the major diameter of the cornea is twice as long 

 as the stalk is broad. The lower antennular flagellum that alone is present, is iS mm. long, 

 just as long as the carapace, rostrum included, and more than one and a half as long as the 



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