150 R. HORST. PARAPERIPATUS LORENTZI. 



The skin (fig. 2) shows large folds, of which about nine are situated between two 

 succeeding pairs of legs; examined by reflected light they appeared continuous, but when 

 made transparent and looked at through the microscope, a narrow non pigmented line becomes 

 visible (fig. 2, m. d. /.). Each fold bears a few primary papillae in a single row, situated on irregular 

 intervais, being separated sometimes by two and sometimes by three, four or five accessory 

 papillae. Between the large folds narrower ones, that are not complète, are intercalated hère 

 and there. Like in Parap. novae-britanniae the primary papillae consist of a conical basai 

 portion and a cylindrical apical one. In the maie the folds of the skin are more densely 

 crowded together and the papillae appear to be also somewhat longer, thus giving the animal 

 a more rugged appearance. There are 22 pairs of legs in the Q, 21 in the çf, whereas in 

 P. papnensis (see above), according to SEDGWICK, the number of legs is variable and amounts 

 from 23 to 29. The legs of Parap. Lorentzi are ail about of the same dimension, only those 

 of the last pair are somewhat smaller, but they are also provided with three pads like 

 the foregoing. Crural grooves occur on ail the legs. In the smaller çf the legs hâve nearly 

 the same dimension as in the 9 and are therefore relatively much larger ; they are also more 

 crowded and diminish in size posteriorly, so that the last pair is much smaller than the 

 preceding ones. Each leg has three spiniferous pads, the middle of which is the largest, 

 about twice as large as the other ones; moreover in most of the legs there are vestiges of 

 a fourth pad, consisting of some small spiniferous areas. 



The rénal papillae of the 4* and 5 l11 pair of legs are connected with the middle of 

 the 3 r< i proximal pad, however without dividing it into two separated halves like in P. novae- 

 britanniae; there is only a narrow groove, that séparâtes the papilla from the posterior half 

 of the pad. Each foot is provided with three primary papillae, one dorsal and two latéral, 

 one on each side. 



The oral papillae consist of two rings that are nearly bare and of an end-knob covered 

 with papillae over its whole surface. The antennae are nearly cylindrical in their distal part, 

 somewhat swollen at their base; they consist of about 50 rings, separated by narrow grooves 

 and each provided with a circle of hairs. 



The mouth is surrounded by a ring of papillae, consisting of an unpaired bifurcated 

 one in front and behind, and 5 to 6 papillae on each side, while at the inner side of this 

 ring 3 to 4 papillae are situated to the right and to the left ; ail are furnished with denticles 

 and sharp chitinous borders like the tongue. The outer jaw-blade (fig. 3) consists of a 

 rather sharp tooth without any accessory denticles on its inner side. The inner blade (fig. 4) 

 however, has six small denticles on the innerside of the main tooth, without diastema; the 

 innermost of them hâve their point not acute but more or less obtuse, eut off. 



The anus is a slit-like aperture, situated at the terminal end of the short anal cône. The 

 génital aperture, lying immediately behind the last pair of legs, is a rather indistinct opening 

 without tumid lips in the female (fig. 1); in the maie it is situated on an elongated back- 

 wardly directed conical papilla (fig. 5). This papilla extends till the anal slit; its terminal 

 part is bare, whereas its base is covered with scattered small papillae. Looking for the opening 

 of the pygidial glands of the maie, at the dorsal side above the anal aperture, I saw there 

 a white string fixed to the skin ; perhaps this is the excreted product of those glands. About 

 the constitution of the reproductive organs not much is to say after the elaborate description 



