[25] DECAPODA FROM ALBATROSS DREDGINGS. 369 



ure iu Acanthephyra, as do the palpi, which are much stouter than in 

 the typical species of Pandalus. 



The following description of the external parts of my species is some- 

 what modified from the original description, based on imperfect speci- 

 mens : 



The carapax is as broad as high, with the cervical suture indicated by a 

 distinct sulcus from the dorsum to the upper part of the hepatic region 

 either side, where the sulcus terminates in a small depression ; the an- 

 terior margin is armed with a stout antennal and a distinct pterygost- 

 omian spine, though the latter is sometimes wanting. Back of the 

 cervical suture the dorsum is very broad and evenly rounded, but there 

 is often a very small dentiform tubercle in the middle line on the pos- 

 terior i^art of the cardiac region; the rostrum iu the smaller specimens 

 is often not half as long as the carapax proper, but in the larger speci- 

 mens much longer, frequently fully as long as the rest of the carapax, 

 nearly straight and horizontal, or curved considerably upward, narrow, 

 with a strong ridge either side, tapering to a more or less acute tip, and 

 with the dorsal carina extending back upon the carapax nearly to the 

 cervical suture and armed with twenty to thirty spines which are di- 

 rected forward, movably articulated with the carapax, thickly crowded 

 posteriorly but more and more remote anteriorly, and of which five to 

 ten are crowded upon the carapax in about half the spa<}e between the 

 orbit and the cervical suture; beneath, the rostrum is ciliated and in 

 most of the specimens entirely unarmed, but occasionally there are one 

 or two teeth near the tip. 



The eye-stalks are short and terminated by small hemispherical black 

 eyes. The peduncle of the antennula is about half as long as the an- 

 tennal scale; the first segment is about as long as the two others taken 

 together, excavated above for the reception of the eye, which, however, 

 does not reach the extremity of the segment, with a prominent lateral 

 process terminating in an acute spine, and the body of the segment 

 itself produced in a spiniform process outside the articulation with the 

 second segment ; the second and third segments are subequal iu length 

 and nearly cylindrical. The flagella are approximately equal in length 

 and often at least twice as long as the length from the tip of the ros- 

 trum to the tip of the telson; the upper is slightly compressed near 

 the base, and, in the male, clothed for a short distance along the lower 

 edge with short hairs, but otherwise like the upper. The antennal scale 

 is thick and strong, about two-thirds as long as the carapax excluding 

 the rostrum, about a fourth as broad as long, and only slightly narrowed 

 toward the tip, which is truncated and does not extend beyond the 

 strong tooth in which the thickened outer margin terminates. The 

 flagellum is subcyliudrical, and often more than three times as long as 

 the length from the tip of the rostrum to the tip of the telson. 



The second gnathopods reach beyond the middle of the antennal 

 scales : the proximal segment is nearly as long as the two distal, verti- 

 cally com|)ressed, with a knife-like mesial edge ; the middle segment 

 S. Mis. 46 24 



