2 4 



Pedes gracillimi, inermes, equales, corpore (rostro incluso) duplo longiores, unguibus 

 auxiliaribus armati sunt nullis. 



Abdomen uniarticulatum, obtuse conicum, perbreve, vix distinguendum". 

 (Nach Wood-Mason). 



i. Rhopalorhynchus kröyeri Wd-Mason. (Taf. XV, Figg. 213 — 220). 



Syn. Colossendeis tenuissima Haswell. Proc. Linn. Soc. N. S. W., V. 9, 1885, p. 1029. 



Stat. 50. Labuan Badjo, Westküste vonFlores. 27 — 36 M. Schlamm und Sand. Ungefähr 80 Expl. 

 Stat. 184. Insel Manipa, zwischen Ceram und Buru. 36 M. Sand. 1 Expl. 

 Stat. 213. Bei Saleyer. 45 M. Sandiger Schlamm. 1 Expl. 



„Body linear, smooth. The rostrum is almost as long as the rest of the body, moveably 

 articulated to the middle of the anterior end of the oculigerous segment, slender and filiform 

 nearly to its middle whence it expands and finally narrows to its obtuse extremity; when 

 examined in profile, the convex upper contour of the expanded portion is seen to carry two 

 minute forwardly-directed spines, the one behind the other in the middle line. The mouth is 

 situated at the extremity of the. rostrum and has the form of a triradiate slit, the three slits 

 being so disposed that a circle described from the point in which they meet so as to pass 

 through their free extremities would be by them divided into three equal sectors. The ocular 

 tubercle is erect, occupies the posterior half of the segment on which it is placed, and has the 

 form of a short cylinder surmounted by a minute cone, the eyes being situated partly on the 

 cylinder and partly on the cone at points corresponding, as usual, to the extremities of the arm of 

 a St. Andrew's cross. A very distinct crescentic suture, bounding the base of the ocular tubercle 

 posteriorly and curving forwards and outwards so that, if produced far enough, it would pass 

 out just in front of the first pair of legs, divides the oculigerous from the first thoracic somite. 



The cephalic appendages of the first pair are absent. Those of the second 

 pair are about i 3 / 8 times as long as the rostrum with which they lie in the same horizontal 

 line, being articulated one on each side of it to the anterior end of the oculigerous somite, are 

 filiform, excessively slender, and composed of nine joints. The first Joint is subglobular, being 

 nearly as broad as long, much broader than any of the succeeding joints ; the second greatly 

 elongated and slightly expanded at the apex ; the third is very short and slightly curved ; the 

 fourth is greatly elongated, but not so much as the second ; the fifth is shorter than either of 

 the four equal terminal joints which, together with the fifth and the distal half of the fourth, 

 are fringed with short and very delicate cilia. Those of the third pair are also extremily 

 slender, are articulated, a little posteriorly and internally to the second pair, to minute processes 

 springing from the ventral are of the oculigerous somite and meeting in the middle line. They 

 are composed of ten joints, of which the first is minute, the two next equal and cylindrical, the 

 third 1 ) greatly elongated and just perceptibly expended at the apical end; the fourth 1 ) short, 

 scarcely longer than the second of the two basal joints, and curved ; the fifth l ) is likewise greatly 

 elongated, but more expanded at the apex and longer than the third x ) ; the four terminal joints 



1) Lapsus calami: statt third lies fourth ; statt fourth lies fifth ; statt fifth lies sixth. 



