MiMONECTES, A REMARKABLE GENUS OF AmPHIPODA HyPERIDEA. 7 



pointed tooth; at the imder-side it is more coarsely serrated. On the 

 inner side of the joint is a dense row of olfactory' (?) hairs. The two 

 following joints are very short, scarcely equalling a twentieth of the 

 length of the first, the upper anterior corner ending in a strong tooth 

 like that of the first joint. [PI. I. fig. 11]. The fourth or last joint 

 is longer than both the preceding together, with a feeble tooth at the 

 upper anterior corner, and a stronger one at the lower; it carries a 

 stout bristle. In structure the upper antennae are similar to the same 

 organs in Tyro ') and Lanceola. 



The loioei' antennce [PI. I. fig. 10] are very short. They consist 

 of four joints; the second joint is the longest. They are fixed at the 

 middle of the under-side of the head, and carry very few, minute hairs. 



Between the base of the upper and the lower antennee is a pro- 

 tuberance, at the summit of which is a large round hole covered by a 

 thin membrane; the interior of the protuberance forms a hollow, and I 

 suppose that the whole is an apparatus for hearing. 



The mouth is not protruding and very small in comparison with 

 the enormous body. The mandibles are very simple without palp, a 

 small protuberance represents the molar tubercle, and three or four short 

 bristles or teeth the biting process. The first pair of maxillce [PL I. 

 fig. 4] consist of three laminae, the median one is armed with 4 — 5 

 strong teeth. The second fair [PL I. fig. 3] consist of two laminse, each 

 armed with two or three teeth. The maxillijoeds [PL L fig. 5] consist 

 of a broad basal joint, two semicircular moveable laminae, truncated 

 at the anterior ends, without hairs or bristles, and a large median 

 lobe. This lobe is deeply divided, so that it seems to consist of two 

 laminte. 



The pereion [PL I. fig. 1]. The first segment is a little shorter 

 than the second (11: 13), and does not reach so high. The second, 

 the longest of all, forms the summit of the globe, and is more than 

 thrice as long at the dorsal side as at the ventral. It is twice as high 

 as the fifth segment, and nearly five times higher than the sixth. The 

 third segment is shorter than the second, (9: 13), but as long as the 

 fourth. The sixth segment is a little longer and a third higher than 

 the seventh, but both are comparatively compressed, not inflated. The 

 epimerals are large, unequal ; that of the third segment is the largest, 

 that of the seventh the smallest, very minute. The more or less circu- 



1) See: Cakl Bovallius 1. c. pag. 13. 



