[17] DECAPODA FROM ALBATROSS DREDGINGS. 361 



slender spine of tlie anterior angle the lateral margin in front of tlie 

 cervical snture is armed with eight to ten slender spines, much smaller 

 than in F.sculptus. The margin of the hepatic region back of the cer- 

 vical suture is armed with fonr or five still smaller spines, and that of 

 the branchial region with twenty to twenty-five minute spines. There 

 are two short rostral spines, and just back of the middle of the gastric 

 region two similar but slightly smaller ones on the dorsal carina, which 

 is low, narrow, and armed the whole length of the carapax with a some- 

 what irregular double line of short and crowded spinules. There are 

 two or three prominent spines back of the orbital sinuses on either side 

 of the gastric region, and the whole surface is armed with many minute 

 spinules and with short hairs. The ophthalmic lobes are each armed in 

 front with a conspicuous spine. There is a single stout spine on the 

 outer margin of the proximal segment of the peduncle of the antennula, 

 which is otherwise essentially as in P. sculptus, as are also the antennsB. 



The first perseopods are imperfect and their chelae wanting in both 

 specimens, but the ischium, merus, and carpus are nearly as in P. nanus. 

 In the posterior perseopods the propodus is a little longer than in P. 

 sculptus or P. nanus, but the propodal digit is shorter, being only about 

 a third as long as the dactylus, which is about three-eighths as long as 

 the propodus. 



The first five somites of the pleon are perceptibly, though very incon- 

 spicuously, carinated, and on the second, third, and fourth somites there 

 is a narrow sulcus each side, extending from near the carina outward 

 and backward to the articulation with the succeeding somite. The 

 pleura are of nearly the same form as in P. sculptus, but are nearly 

 smooth externally, and the edges are wholly unarmed. The sixth somite 

 is rounded and smooth above. 



The telson is a little longer and more slender toward the tip than in 



P. sculptus or P. nanus, and has a low triangular elevation near the 



base. 



Measurements in millimeters. 



Station 2084 2074 



Length from front of carapax to tip of telson 



Lengtb of carapax along median line 



Breadth of carapax between spines of anterior angles 



Greatest breadtu including spmes 



Length of merus of first peifeopod 



Length of carpus of first perasopod 



Length of second peraeopod 



Length of chela 



Length of dactyhis 



Length of fifth porteopod 



Length of propodus , 



Length of dactylus 



Length of telson 



Breadth of telson 



Station 2074, September 3, north lat. 41o 43^ west long. 65° 21' 50", 

 1,309 fathoms, fine mud, temperature 40°— 1 $ (7145). Station 2084, 

 September 5, north lat. 40° IC 50", west long. 67° 5' 15", 1,290 fathoms, 

 blue mud and sand, temperature 40^ — 1 $ (714G). 



