146 



median line; a narrow list is found between the maxillae; the whole skeleton is naked. The 

 trunk entirely naked ; trunk-legs wanting. The genital area (fig. 2 f ) deviates strongly from 

 all other species ; it is considerably larger than the head (fig. 2 a) and much longer than 

 broad. The solid chitine forms posteriorly a narrow semi-circle which opens towards the 

 front, each branch dilating anteriorly on the internal side to a considerable breadth, after 

 which both branches run on parallel a long way, at the same time gradually declining in 

 breadth; the whole structure may also be described by saying, that there are two anteriorly 

 pointed, posteriorly broader, mutually parallel lists, which again decrease in breadth in their 

 hindmost part, converge, and at last join in a semi-circle. The somewhat curved genital 

 apertures are situated at some distance from each other, so that their outer ends come close 

 to the inner side of the semi-circle; their muscles run forward and a little outward towards 

 the broadest part of the lists, close in front of the foremost part of the semi-circle. (About 

 the orifices of the receptacula seminis which are omitted in the drawing, see above on p. 14.) 

 The whole area is naked, and caudal stylets are altogether wanting. 



MALE. The body, apart from the rostrum, is -18 mm. in length; seen from below, 

 it is ovate, only about one sixth longer than broad; the thickness in proportion to the breadth 

 is almost like two to three; so it is exceedingly small compared with the female (fig. 2b : 

 fig. 2 a). It deviates strongly from all other species, and in spite of much study and long 

 deliberation, I have been unable to understand all its details. Head and trunk of about 

 equal size. The frontal border is not produced, its margin flatly curved, naked. Antennulse 

 long, without articulation, with setae of medium length. Antennae wanting. .Rostrum unusually 

 long, very broad at its base, and in the specimens found, strongly protruding, which gives 

 it, when seen from below, the shape of a large, distally blunt cone, projecting considerably 

 beyond the frontal margin. Maxillulae as in the female. Basal joint of the maxillae some- 

 what compressed, broad between the foremost and hindmost angles; the basal margin is 

 long, and its acute posterior angle is further removed from the head than the articulation 

 of the second joint; its outer side is armed with a pair of conical taps. Maxillipeds of 

 medium length, the basal joint somewhat fusiform, on the inner and anterior sides some 

 areas covered with numerous extremely short hairs; second and third joints coalescent, 

 last joint pointed. The sub-median skeleton possesses only the first pair of processes, each 

 of which being long, very slender and nearly setiform (fig. 2h, i), and being a prolongation 

 of a list running inside the maxillae. The lateral margin of the head is prolonged backward 

 to the middle of the trunk, and it is provided with a stripe of rather short hairs which are 

 situated more or less close together. The ventral surface of the trunk is for the most part 

 covered with tolerably short hairs, many of which are arranged in transverse rows, whereas 

 the back, the lateral surface and the hindmost extremity are naked. I have been unable to 

 understand the basal parts of the trunk-legs, I cannot even make out with absolute certainty 

 which pair are the foremost. I consider the narrow pair of appendages which are situated 

 near the median line to be the caudal stylets, and the limbs which are seen a little outside 



