19i STALK-EYED CRUSTACEA. 



The epipods themselves consist of a thickened basal segment which boars a 

 thinner fiabelliform terminal segment. 



Length, 94 mm. ; rostrum, 9 mm. ; carapace, including rostrum, 33 mm. 



Station 3413. 1360 fathoms. 1 fern. 



ARIST.ffiUS DUVERNOY. 

 Auu. Sci. Nat. 2» Ser., XV. lOJ., 1841 IJnsieiis']. 



Aristaeus occidentalis Fax. 

 Plate XLIX., Fig. 2-2\ 



BuU. Mus. Comp. ZooL, XXIV. 215, 1893. 



Rostrum much longer than the rest of the carapace, armed with two 

 teetli near the proximal end of the upper margin, its distal two thirds 

 curved upward. Anterior half of the carapace with a median dorsal carina, 

 armed with one tooth on the anterior part of the gastric region. Cardiaco- 

 branchial groove distinct. Antero-lateral margin armed with a sharp tooth at 

 the lower orbital angle. Below this there is a submarginal spine on a level 

 with the second antennte. Fourth abdominal segment carinated on its distal 

 half, and armed with a small posterior tooth. Fifth abdominal segment cari- 

 nated on the distal two thirds, and produced to a tooth on the posterior 

 margin. Sixth abdominal segment carinated throughout its whole length, 

 and armed with a posterior tooth. Margin of telson excavated near the 

 base. 



External spine (stylocerite) of the basal segment of the antennule a little 

 longer than the segment, closely applied to the external margin of the seg- 

 ment, but not fused with it. Prosartema wanting. 



Anteinial scale broad, membranaceous, reaching beyond the superior an- 

 tennular flagelhim, and a little beyond the middle of the rostrum ; antennal 

 peduncle unarmed. Terminal segment of mandibular palpus not bilobed. 

 Exopod of second maxilliped equal in length to the whole endopod. Exopod 

 of tliird maxilliped equal in length to the ischium and merus together. 

 There are no exopods on any of the legs. Carpus and propodite of the legs 

 ornamented with a longitudinal series of small pits defined (in alcohol) by red 

 pigment. External branches of abdominal appendages very long, diminish- 



nopeneu* as described by Smith), there are none on tlie third maxilMpcds or any of the legs, wliilc in //. thdis 

 nidimcntary podobraucliia! are found on the third maxillijieds and the first, second, and third pairs of legs. 



