402 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [58] 



a\\(\ nearly half as lii^^h as long, has a thiu dorsal carina, nearly the 

 •whole length. The ])leura are rather small and the posterior angles 

 more or less rounded in all the somites. 



The telson is abont two-thirds as long as the sixth somite, narrowly 

 triangular, thickened at base, with a longitudinal sulcus the whole 

 length above, and with a shorter one either side near the base, and with 

 the tip truncated, narrow, and armed with a spine either side and a 

 series of long plumose hairs between. 



The inner lamella of the uropod is a little longer than the sixth so- 

 mite, lancealate, and about five times as long as broad. The outer 

 lamella is about a third longer than the inner, scarcely wider propor- 

 tionally, and with the ovate tip prolonged about the width of the lamella 

 beyond the sharp spine in which the outer margin terminates. 



In both sexes the protopods of the pleopods are stout and all nearly 

 alike ; the outer rami are all very long and slender, and the inner rami 

 of the four posterior pairs are shorter and more slender than the outer. 

 The x>eculiar sexual appendage of the first pleopod in the male is carried 

 as in BentJicecetes Bartletti, and, as in that species, consists of a thiu, 

 squarish plate, divided by imperfect articulations into three parts and 

 attached by a constricted base, below which there is a small, broad, 

 oval process ; but the middle of the three parts is as large as the two 

 others combined, interiorly projects beyond the other parts, and at 

 either side there is an obtuse tooth, above the inner of which there is an 

 obtuse lobe in the margin and then a deep and narrow notch separating the 

 middle from the inner or distal part, while on the anterior side, above the 

 notch, there is an oblong process which may be turned either in over the dis- 

 tal part of the plate or out over the middle part ; the distal part is thin, 

 membranous, curls easily over upou the middle part, and is armed along 

 the free edge with minute hooked spines. There are two oblong lamel- 

 lar plates at the base of the inner ramus of the second pleopod much 

 larger than the corresponding plates in Benthcecetes Bartletti ; the outer 

 l)late is somewhat truncated at the extremity and the inner rounded. 

 On the inner side of the base of the outer ramus there are two small 

 inconspicuous dentiform processes or plates, one above the other, and 

 with their points opposed. 



Specimens in alcohol retain for a considerable time bright purple 

 tuarkings about the oral appendages. 



Most of the specimens seen are between 30™™ and 40™™ in length, a 

 few females only exceeding the latter measurement. Detailed measure- 

 ments of a large female are given under the next species. 



Amalopen^us valens, sp. nov. 



(PlateX, Fig. 2.) 



This species, of which there is only one specimen (5536), is closely al- 

 lied to the last, but is readily distinguished from it by the larger eyes 

 and different petasma. 



