REPORT ON THE CRUSTACEA MACRURA. 661 



The pleopoda arc biramosc, and foliaceous. The first pair has the branches unequal, 

 but in the following pairs they are nearly equal and carry a long, cylindrical stylamblys 

 attached to the inner and posterior branch. The posterior pair forming the lateral plates 

 of the rhipidura, is subequal in length with the telson and fringed with ciliated hairs. 



Male. — The male corresponds with the female in form, but is smaller and more 

 slender, to judge from a single specimen of each, in which there is no evidence of age 

 to assist in a comparison. The pleon is more compressed in the male than in the egg- 

 hearing female, and all the parts are relatively similar, excepting that in the male the 

 smaller branch of the first pair of pleopoda is developed into a large petasma, 

 approaching somewhat to that which exists in the Penseidfe. The other pleopoda 

 resemble those of the female, but support two stylamblydes. 



Noikocaris g&niculatus (A. Milne-Edwards) (PI. CXVI. fig. 4). 



Pandalus genieulatus, A. Milne-Edwards, Recueil d. Fig. Crust., 1883. 



The carapace is smooth, the frontal region is slightly compressed and crested with five 

 or six small articulating spines ; the rostrum is upwardly curved, not quite so long as the 

 carapace, and armed, for more than half its length on the upper margin, with eleven 

 fixed and rigid teeth, directed almost horizontally forwards and closely pressed against 

 each other ; the distal extremity is smooth and free from armature ; on the low r er margin 

 there are seven or more teeth, those at the extremity becoming feeble and diminishing 

 in size. 



The pleon is dorsally smooth and has the third somite elevated and posteriorly 

 produced in the median line to a blunt point, which lies closely pressed against the 

 surface of the fourth. 



The telson is long, narrow and tapering. 



Habitat— Station 122, September 10, 1873; lat. 9° 5' N., long. 34° 50' W.; off 

 Barra Grande, Brazil; depth, 350 fathoms ; bottom, red mud. Seventeen specimens ; six 

 males and eleven females. Trawled. 



The ophthalmopoda are short, and the ocellus is in immediate contact with the 

 pigment of the ophthalmus. 



