100 CARL BOVALLlUy, AMPHIPODA HYPERIIDEA. I. 2. HYPERIIDiE. 



Hypcroche Luetkeni. 



large, triangularly produced, the edgu armed with small teetli and very short hairs. The 

 palp is fixed at the lovver outer covner of the mandible, the first joiiit is shorter and 

 scarcely broader than the second joint, in this latter there is a double band-like gland, 

 each half of which is composed of six to seven glandular cells, the outlet for this gland 

 is situated on the interiör or hind side of the joint, forming an elongated hssure betAveen 

 the two halfs of the gland, and surrounded by a very powei'ful muscle (Pl. VII, hg. 6); 

 the third joint is considerably longer than the second, evenly tapering towards the apex 

 into a sharp point; on the sides of the last joint there is a row of short ciirved hairs, at 

 the apex it is fringed with a row of rainute microscopical hairs. 



The first pair of maxillce (Pl. VII, hg. 7) consist of an almost cubieal basal joint 

 and two laminaB; the inner or principal lamina is long, the basal portion forming a broad, 

 linear stem, the apical portion forms a gouge-shaped, feebly curved |)rocess, the margins 

 are fringed with curved spines; the secondary lamina is broadly rounded, spoon-shaped, 

 bent över the principal lamina, the margins set with spines and bristles; it articulates 

 with the stem just at the base of the gouge-shaped j^rocess of the inner lamina. 



The second pair of maxillce (Pl. VII, fig. 8) consist of two lamime, the principal 

 lamina is triangulär, obtuse, covered with stout bristles; the secondary lamina is more 

 narrowly elongated, covered all around with bi-istles, and provided at the apex with a 

 strong, feebly curved spine. 



The maxillipeds (Pl. VII, lig. 9) consist of a strong, broad, basal portion; the lateral 

 lamina3 are obtusely serrated on the lower half of the inner margin; the median lobe is 

 strongly developed, bent inwards, the apex forming a gouge-shaped projection, richly 

 covered with short, strong bristles. 



The perceon. The lirst segment is a little longer than the second, the seventh 

 segment is the longest of all. 



The epimerals are as long as the under margnis of the corresponding segments; 

 the epimeral of the fifth pair is the longest of all. 



The branchial säcks are fixed to the second to sixth pairs of peraaopoda; they are as 

 long as the femora of the corresponding pairs. 



The first pair of perceopoda (Pl. VII, fig. 10, 11 and 12). The femur is broadly 

 ovate, the front margin being more convex than the hind one, and showing a long narrow 

 groove for the reception of the following joints. The femur is about twice as long as 

 broad, and nearly as long as the four following joints together. The genu is smooth, 

 scarcely more long than broad. The lower hinder corner of the tibia is strongly produced, 

 forming a spoon-shaped process, not fully reaching to the base of the carpal process; the 

 lower margin of the tibial process is fringed with stout bristles. The carpus is strongly 

 developed, the front margin is almost straight, a little shorter than the front margin of 

 the metacarpus, the hind margin is straight, or rather somewhat excavated; the carpal 

 process is nearly as long as the stem of the joint, robust, knife-shaped; the front margin, 

 the edge of the knife-like process, is armed with more than twenty sharp- pointed teeth, 

 the points of the teeth being directed somewhat downwards. This carpal process, as well 

 as that of the second pair of perseopoda, is formed in a different way than in the other 

 genera of the family as has ah-eady been alluded to above, p. 84. In Hyperia for instance 



