26 DE. W. T. CALMAiV ON NEW OR EARE 



The abdomen is longer than the cephalothoracic region, the somites subcylindrical 

 and having well-developed lateral articular processes. 



Antennule having the first segment of the peduncle longer than the other two 

 together, the third twice as long as the second. The accessory flagellum is represented 

 by a minute nodule ; the outer flagellum has two segments. Antennae simple, un- 

 segmented and without a terminal process, bearing two plumose setse. 



Mandible of the nsual form, bearing about twelve spines. Lower lip not seen. 



Maxillular palp longer than the distance from its base to tip of distal lobe, with two 

 terminal setae. 



The first maxilliped has the basis much shorter than the remaining segments 

 together. The posterior portion of the branchial apparatus proved very difficult 

 to isolate, but its lobules are very slightly developed, only two small papillae being 

 observed. The anterior portion, however, is remarkably developed, its distal part 

 forming a long siphon capable of extension and retraction. The proximal part or stalk 

 is, as usual, strengthened by a chitinous rod, with which is connected distally a spoon- 

 shaped plate acting as a valve to close the branchial aperture. Beyond this the tubular 

 portion is formed by a broad and very long strip of transparent membrane rolled up 

 into a spiral with numerous coils " telescoped " into each other. This membrane is 

 marked along its length by parallel striae or plications, which form a complex spiral 

 pattern when it is rolled up. When fully extended the siphon projects beyond the 

 branchial aperture for a distance equal to at least twice the width of the anterior part 

 of the carapace ; when the coils are closed together it forms a short cone protruding 

 from the opening. Very often in the preserved specimens the siphons are unequally 

 extended on the two sides. 



The second maxillipeds have the basis shorter than the remaining segments 

 together. The basal plate bears four long setae on its distal edge and one short seta 

 externally. 



The third maxilliped has the basis rather sharply bent, the proximal part being 

 about half as long again as the distal measured along the inner edge. It is produced 

 externally beyond the articulation of the ischium into a pointed lobe, which is 

 nearly two-thirds as long as the segment itself and which bears a row of plumose setae 

 on its inner edge and another on its lower surface. The merus is about half as long as 

 the ischium along its inner edge and is expanded externally into a very large curved 

 lobe, bearing along feathered seta at its tip. The terminal segment is very small, little 

 more than half the length of the preceding. 



The first legs have the penultimate segment extending a little beyond the pseudo- 

 rostrum. The basis is about two-thirds as long as the remaining segments 

 together, with a small tooth at the distal end of its outer edge and a long plumose seta 

 internal to it. The terminal segment is about half the length of the preceding. 



