occurring on the Norwegian Coasts. 333 



series of eight short blunt spines. The palpi of the first pair 

 of maxillae are beset with teeth at the apex ; their outer lamella 

 is elongated and acute above. The two lamellae of the second 

 pair of maxillae are nearly of equal length, narrow, and bent 

 in a sigmoid form. The outer lamella of the maxillipedes is 

 closely set on the margin with small blunt teeth. The palpi 

 are narrow and long ; the third joint is only a little shorter 

 than the second. The fifth joint of the first pair of feet is 

 longer than the fourth, and straightly truncated at the apex. 

 The claws are very strong. The legs of the second pair are 

 very long and narrow, with their last joint short. The last 

 three pairs of abdominal feet are long ; the branches of the 

 seventh pair are lanceolate. The telson is oval ; the end is 

 emarginate triangularly to the middle ; and both of its lobes 

 are furnished on the outer margin with four short, but strong 

 spines. The posterior lower angle of the third abdominal 

 segment is nearly a right angle, and its posterior edge is 

 serrated. 



2. A. jnnguis, mini. — The first joint of the flagellum of the 

 superior antennae is nearly as long as the other seven together; 

 the first joint of the secondary flagellum is long, and dentate 

 on the lower surface ; the other three joints are short. The 

 first two joints of the inferior antennas are short, the third long, 

 the next joint longer and thicker than this, and the fifth shorter 

 than the third. The flagellum consists of twenty joints. The 

 form of the first pair of feet is as in the preceding species, but 

 the fourth joint is still shorter. The fourth joint of the second 

 pair of feet is short, but clavately thickened at its lower end. 

 The parts of the mouth are shorter and stronger than in the 

 preceding. The series of spines on the mandible consists only 

 of three teeth ; the masticatory tubercle is oval and prominent. 

 The outer lamella of the maxillipedes, which reaches to the third 

 joint of the palpus, is furnished at the apex with two strong, 

 curved, and pointed teeth ; the others are unarmed. The last 

 pair of abdominal feet are narrow ; their outer branch is much 

 longer than the inner one, and furnished with a spine at the 

 apex. The telson is cleft only in its posterior third. The 

 epimera are very high ; the fourth is deeply emarginate on its 

 hinder margin, and the fifth is higher than broad. The lower 

 posterior angle of the third abdominal segment is rounded. 

 The fourth segment has a saddle-like depression in its middle. 



The following species have the lower and posterior angle 

 [of the third abdominal segment] produced into a recurved 

 hook. 



3. A. obtusifronsj mihi. — The first joint of the flagellum of 

 the superior antennas is as long as the following seven toge- 



