60 BULLETIN OF THE 



way from the orbit to the posterior margin, with two to four slender spines 

 crowded close together, rapidly decreasing in size posteriorly and movably artic- 

 ulated with the carapax ; but between these teeth and the posterior teeth of the 

 rostrum the carina is wholly unarmed. The rostrum is curved upward a little 

 more than in P. Montagui, is not expanded below, and is armed the whole 

 length above with eight to ten teeth, which are usually more widely separated 

 distally, though in some specimens the terminal two or three are crowded 

 together near the tip ; beneath there are six to ten small teeth. 



The eyes are black and as broad as long, but shorter than in P. Montagui. 

 The peduncle of the antennula reaches to near the middle of the antennal scale, 

 and the two distal segments are subequal in length and each about as broad as 

 long. The antennular flagella are subequal in length and much longer than 

 the carapax, including the rostrum ; the proximal half of the outer flagellum is 

 very much thickened, the terminal portion very slender, as is. the inner flagel- 

 lum throughout. The antennal scale is approximately four fifths as long as the 

 rostrum, and of very nearly the same form as in P. Montagui. The oral ap- 

 pendages differ from those of P. Montagui in the following particulars : the 

 proximal segment of the mandibular palpus is dilated, though not quite as 

 conspicuously as in P. Montagui ; the posterior lobe of the scaphognath of the 

 second maxilla is very short, broad, obtusely rounded at the extremity, and 

 projects very little back of the base of the endognath, while in P. Montagui 

 and the allied species it is very much prolonged and acutely triangular pos- 

 teriorly ; in the second maxiUiped the dactylus is about as long as broad, and 

 articulated with the oblique distal end of the propodus (PI. XIII. fig. 12), 

 while in P. Montagui and its allies the dactylus is a narrow plate, articulated 

 by one edge to the distal part of the mesial edge of the propodus. The external 

 maxillipeds are very slender, reach to about the tip of the rostrum, and have 

 well-developed exopods, fully half as long as the ischium ; the ischium is a 

 little longer than the rest of the endopod, which is composed, as in P. Mon- 

 tagui, of only two distinct segments beyond the ischium, and in this case these 

 two segments are subequal in length. 



The legs of the first pair are very slender, and reach to the tips of the external 

 maxillipeds. The second (chelate) legs are exactly alike, and reach to or con- 

 siderably by the tips of the antennal scales. The ischium is a little longer than 

 the merus ; the carpus is a little less than twice as long as the merus, slightly 

 shorter than the antennal scale, and composed of about fifteen segments, of 

 which the proximal are separated by indistinct, but the four or five distal by 

 conspicuous articulations, while the ultimate is about twice as long as broad, 

 and the next three or four, each, only about half as long as broad. The chela 

 is slender, only a very little stouter than the distal end of the carpus, nearly 

 a third as long as the carpus, and about half as long as the merus, and the 

 digits are alike, about as long as the basal portion, slightly gaping, and with 

 a very few long, setiform hairs. The third, fourth, and fifth pairs of legs are 

 exceedingly slender, sparsely armed with minute spinules and slender setae ; 

 and the dactyli are very long and slender, slightly and regularly bent, and 



