REPORT ON THE CRUSTACEA MACRURA. 



521 



to the posterior margin of the somite ; in all the other species it is interrupted near the 

 centre. The telson is longer than the branches of the rhipidura, and forms a formidable 

 spear-like weapon. 



Observation. — This species may be at once recognised by the large orbital tooth. 



Glyphocrangon aculeata, A. Milne-Edwards (PI. XCIV. fig. 1). 



Glyphocrangon aculeatum, A. Milne-Edwards, Ann. d. Sci. Nat., ser. G, torn. si. p. 5, 1884. 



Carapace one-third the length of the animal, ornamented with eight carina?. Kostrum 

 long, narrow, and about three-fourths the length of the carapace. Antenna! and fronto- 

 lateral teeth are large, but not so broad as the hepatic tooth at their base, which is the 

 largest, extending from the cervical fossa to near the frontal margin of the carapace as a 

 great anteriorly pointed ridge. Behind the cervical fossa, at the anterior extremity of 

 the lateral carina, is a strongly projecting tooth of less size than the previous one. The 

 surface of the carapace between the several carina is generally smooth, a few scattered 

 tubercles being slightly indicated. 



Habitat. — Station 120, September 9, 1873; hit. 8° 37' S., long. 34° 28' W.; off 

 Pernambuco ; depth, 675 fathoms ; bottom, red mud. One specimen ; female. Trawled. 



This species was described by Professor A. Milne-Edwards as having been taken in 

 593 fathoms, off Martinique, during the cruise of the "Blake" in the "West Indies. It 

 nearly corresponds with Glyphocrangon spinicauda, A. Milne-Edwards, which was 

 taken in 250 fathoms off St. Kitts in the same geographical region. Our specimen, which 

 was taken some degrees further south in the Atlantic, off the eastern coast of South 

 America, is rather smoother than either of the above. 



In the Challenger specimen the rostrum is about three-fourths the length of the 

 carapace, and reaches beyond the distal extremity of the peduncle of the first pair of 

 antennae. The scaphocerite attached to the second pair of antennae is furnished with a 

 small tooth on the outer margin about halfway between the distal extremity and the 

 articulation. The dactylos of the posterior pair of pereiopoda (fig. lo) is flat and sharply 

 lanceolate. 



(ZOOL. CHALL. EXP. PART LII. 1887.) Fff 66 



