40 



oart which ends in sharp lateral points, the membranous portion 

 both of this and the uropods being slightly roughened. 



The first antennae have the first joint longer than the second 

 and third together, the third about twice as long as the second, 

 and rather longer than the inner flagellum ; the outer flagellum is 

 shorter than the inner, stouter at the base, and strongly setose 

 on its inner margin. The second antennre have the epistomial 

 base deeply grooved in the middle. If this be taken to represent 

 the first two joints of the peduncle, then the third (or first free) 

 joint has two teeth on the outer, one on the upper, one on the 

 inner side, with some serration also on the inner margin ; the 

 fourth joint has about 12 teeth in various sequences, and the fifth 

 fourteen of various sizes. This peduncle does not reach the end 

 of the third joint of the first antenuc-e : the fiagellum is 9 inches 

 long. 



The five pairs of trunk legs are all simple and slender, decreas- 

 ing in stoutness and increasing in Icngtth from the first to the 

 fifth pair. The fourth joint is shorter in the first pair than in the 

 second and in the second than in the third, but without sensible 

 difference of length in the fourth and fifth. On the other hand, 

 the length of the sixith joint sensibly increases from the first to 

 the fifth pair, while it is considerably stouter in the first than in 

 any of the succeeding pairs- The sternal plastron between these 

 from a narrow base widens greatly, with a longitudinal median 

 series of five teeth and two submedian on its hind margin. Late- 

 rally each of its divisions has two decided teeth, widest apart in 

 the last division, and there more clearly than in the others, 

 accompanied by some small denticles- 



Of the pleon segments, the first one carries ventrally two sub- 

 lateral teeth on its hind marg-in. The four pairs of pleopods 

 are delicate oval plates fringed with short setas. The uropods 

 reach a little beyond the telson; the outer ran-^us is raJther longer 

 and broader than tlie inner. 



The colour of the specimen in formalin is orange and orange- 

 red, the fiagella of the first antennse, the fifth and sixth joints of 

 the trunk limbs of th^^ membranous part of the caudal fan, 

 and the ventral surface of the pleon, except on the hind 

 margin of each segment, being pallid. 



The length from rostrum to end of telson is about four and a 

 half inches, the carapace measuring 42 mm. by a breadth of 2& 

 mm. ; tlie telson 24 mm. by 15 mm. ; 



Locality: — The single specimen — a male — was taken by .>ln-imp 

 trawl. Buffalo River north 15 miles- Depth. 310 fathoms. 

 Bottom, coral and mud- 



The specific name is given out of respect to the late Mr. T- J. 

 Parker, who instituted the genus. To the remarkable armature 

 of this beautiful species there is no resemblance, so far as T know,, 

 in anv other li\ incf Palinurid bitherto descrilied- 



