214 DR. C. CHILTON ON THE STJBTEREANEAN 



I have not been able to make out the second maxillce quite satisfactorily, for they seem 

 to be closely connected at the base with the part I have considered the lower lip, and it 

 is difficult to separate the two without injuring them; the first maxillse are not connected 

 with these, simply working between them and being articulated to the head much 

 posteriorly. Usually the lower lip and second maxilla come away together and then 

 present the appearance shown in fig. 11 ; this evidently corresponds to Dohrn's " fig. 9," 

 which he calls the " Verwachsenes zweites Maxillenpaar (?) " ; but in the species he 

 describes the central portion (lower lip ?) is deeply cleft, while it is not so in Cruregens. 

 In this figure 11 the base of the second maxilla can be seen as a strongly curving bar 

 proceeding from a central portion that lies just along the base of the lower lip, and is 

 perhaps joined to it ; on each side this bar afterwards curves inward and ends in an 

 expanded distal portion bearing numerous fine setae. The whole of this end is soft and 

 delicate ; it is difiieult to make out its exact form, but it appears to widen out verti- 

 cally, and probably helps to close in the sides of the suctorial tube formed by the mouth 

 (see fig. 13). 



The maxillipedes (fig. 14) have the basal portion completely ankylosed to the under- 

 side of the head ; about the middle there is a small and chitinous plate similar to that 

 figured by Dohrn in Paranthura costana and by Norman and Stebbing in Anthelura 

 elongata [106, pi. xxv. fig. 1, c, l]. In the latter species the corresponding plate is 

 slightly pointed at the extremity, and is situated nearer the posterior end of the head, 

 at the base of the maxillipedes. Hence it appears probable that this plate represents 

 the large chitinous plate found in Phreatoicus, the Idoteidfe, Asellidae, &c., and is 

 therefore the epipodite. In Cruregens, however, this plate is situated much further 

 from the posterior margin of the head, and the remainder of the maxillipede has been 

 so modified that all trace of its separate joints has been lost. Anteriorly from this the 

 two maxillipedes are contiguous for a short distance, but then rapidly separate, a seta 

 being placed in the middle of the inner concave margin. The extremity narrows nearly 

 to a point, and has at the end a very small terminal joint bearing a number of rather 

 long setae, one or two others being situated on the outer edge at a little distance from 

 the extremity. 



The first pair of legs (figs. 15, 16) forms powerful subchelate claws, which can be 

 extended considerably beyond the head and even beyond the ends of the antennae. The 

 coxa is indistinguishable and appears completely ankylosed to the body-segment. The 

 basos is narrow at the base and rapidly widens out to its greatest breadth at the middle, 

 where the breadth is rather more than one-thu'd of the length ; it narrows again slightly 

 towards the distal end ; the posterior margin is regularly arched, the anterior sinuous ; 

 near the base there are two rather long "auditory setae." The ischium is equal in length 

 to the basos and is similar in form ; the posterior margin is convex and bears four small 

 spinules ; the anterior side is hollowed out into a longitudinal groove to receive the rest 

 of the limb when bent back upon it. The meros is short, transverse; at its jimction with 

 the ischium it is narrow, but it rapidly widens out, forming anteriorly an oval lobe, which 

 bears at the end a few smaU setae ; the posterior margin is straight, lies in the same 

 line as that of the ischium, and bears two setae at the extremity. The carpus is small, sub- 



