Miscellaneous. 343 



dricis, utrinque dilatatis, processibusque lateralibus raagnis, ob- 

 conicis. Rostrum uniarticulatum, elongatissimum (corporis lon- 

 gitudinem paene aequans), clavatum, ore triradiato. Annulus 

 oculiger in collum vix coarctatus. Appendices cephalicce primi 

 paris absunt : appendices cephalicce secundi paris tenuissimae, 

 rostro longiores, novemarticulatae, articulis secundo tertioque elon- 

 gatis : appendices cephalicce tertii paris paulo longiores, ex decern 

 confectae articulis — quorum quartus sextusque sunt elongatissimi, 

 terminalesque quatuor prehensiles ac margine interiore serrati 

 ciliatique — in utroque adsunt sexu ; appendices utriusque paris, 

 secundi ad tertium, tertii ad quartum articulum, sunt geniculatae. 

 Tubercul its oculiger in postica annuli parte est situs. Pedes gra- 

 cillimi, inermes, asquales, corpore (rostro incluso) duplo longiores, 

 unguibus auxiliaribus armati sunt nullis. Abdomen uniarticu- 

 latum, obtuse conicum, perbreve, vix distinguendum. 



Rhopalorhynchus Kroyeri, n. sp. 



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

 the body, movably articulated to the middle of the anterior end of 

 the oculigerous somite, 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 arms 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 once and two thirds 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 so 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 extremely slender, are articulated, a little 



