.S32 TACK sK()<'.si!i';i;o 



situated medio-distally, and are practically quite without any distinct arrangement in groups. 

 Apart from the bristle of the endite there are no bristles at all on this joint. Basalc: Of the 

 ventral bristles one d-bristle is very long and has numerous long secondary bristles arranged 

 in irregular wreaths; distallyit has short hairs; the others of these bristles are of moderate lengtli 

 or short and they all have short hairs or are almost bare. This joint has three bristles dorsally. 

 E n d o p o d i t e: The first joint has four bristles ventrally. The end joint has seven bristles, 

 of which the two middle ones are powerful, claw-shaped and of somewhat different lengths. 

 Maxilla: — Protopodite: The part of the procoxale and the coxale from 

 which the three endites issue is developed as a somewhat heart-shaped appendage with an 

 independent power of movement. The coxale has dorsally a single bristle. Proximally on the 

 outside of the third endite there is a single bristle. On the boundary between the basale and 

 the first endopodite joint there is only one bristle. No e p i p o dial a p p e n d a g e is devel- 

 oped. The e X o p o d i t e is very small comparatively and is displaced distally. The 

 ■endopodite is long and narrow, the first joint is very much lengthened. (The proportion 

 between the length of this joint and that of the second endopodite joint of the mandible is about 

 1:1, whereas in other species of this sub-family the proportion between the lengths of these 

 two joints is about 2 : 3. 



Sixth 1 i m 1j: — The second e x o p o d i t e joint is very much elongated, becomes 

 graduallv narrower distally and has numerous bristles; its two posterior bristles form a sort 

 of direct continuation of the joint and are strikingly larger than the other bristles on this joint. 

 Seventh limb: — This is sometimes furnished with rather niimerous, sometimes 

 with quite a few, cleaning bristles. In the former case a large number of bristles and in the latter 

 case a few bristles are concentrated ventero-distally but there is no such concentration dorso- 

 distallv. The other bristles are scattered irregularly along the distal part of the limb; with 

 regard to the position oi these bristles it is to be noted that in only a rather few cases more than 

 one bristle is to be found on the same side of the same joint; sometimes (twice in the accom- 

 panying figure) two bristles are found close to each other on the same joint. The end comb 

 consists of a moderate or a rather large number of rather strong teeth, some fairly long distal 

 teeth, finely serrated on either side and rounded distally and some shorter and bare proximal 

 teeth, cut off rather sharply distally. The part of the wall of the limb that is enclosed by the 

 end comb is very much thickened and powerful; the part dorsally of the end comb is developed 

 as a large and powerful chitinized jaw-like process, which moves freely and is furnished distally, 

 on the side that is turned in the direction of the end comb, with a series of powerful teeth. On 

 account of this the distal part of this limb gets an appearance very like the head of a fish. The 

 ,, upper jaw", the part of this limb on which the end comb is fixed like a set of teeth, can 

 evidently be pressed a little downwards by the posterior longitudinal muscles of the limb; 

 a Fold of chitin, which goes from the ,, corner of the mouth" ventero-proximally to an articulation 

 knob situated somewhat below half the height of the „head", shows the place where the bend 

 takes place (cf. fig. 22 of M. (C.) acuminata). The compression of the ,,jaws" takes place by 

 means of an exceedingly powerful paired naiscle, whicli ris(>s up proxinuilly somewhat proximally 

 of the „k)wer jaw" and is fixed distally to the wall of the limb, ventrally of the proximal teeth 



