MONOGEAPH OF THE AMPHIKOMACEA. 225 



Sp. 16. EURTTHOE MACROTRICUA. 



Amphinome macrotricha, Schnarda, Neue wirbell. Thiere, i. 2. p. 144. 

 fig. xylogr., tab. iJ4. f. 290 ; Quatrefages, Hist. Nat. Anneles, i. 

 406. 

 Hah. Jamaica, Schmarda. 



Sp. 17, PEuetthoe clavata. (Plate IV. figs. 5o,Z».) 



Corpus depressum, subquadratum, ad extremitates utriiique 

 attenuatuin, e segmeiitis 55 s. 56 constans. Caruncula ovalis, 

 mediocris, segmenta tria prima tegens. Setae pedum dorsalium 

 ad apicem curvatae, dilatatae seu clavatae, simplices ; setae pedum 

 ventralium bifurcae, laeves. Branchiae parvae, ramis ramulisque 

 numerosis. 



Long, tres uncias aequans. 



Hah. '^ {Mus. Brit.). 



"Worm about 3 inches in length, of a flatly subquadrate shape, 

 and consisting of about 55 or 56 segments. Body of a very 

 dark colour ; bristles of feet, especially those of ventral or lower 

 tuft, light or yellowish coloured, and tipped at the points with 

 dark brown. The caruncle is rather large, of an oval shape, 

 the edges not rolled up, and extending over the first three seg- 

 ments. 



The specimen under observation is thickest and broadest in 

 the middle ; narrowed at each extremity, but becoming suddenly 

 contracted about the thirty -fourth segment, and appearing much 

 rower at the posterior than at the anterior extremity. 



The setae of the upper or dorsal tuft (fig. 5 a) are slightly 

 curved and obtuse or rather club-shaped at the extremity, which 

 is simple and not toothed. Those of the lower or ventral tuft 

 (fig. 5 h) are bifurcate, the rami not serrated, and the points 

 rather blunt. 



The branchiae are small, numerously ramified, and of a dark 

 colour. 



Only one specimen of this species has occurred, and we have 

 no history as to its habitat. 



Grenus IV. Ltcarettjs. 



Lycaretus, Kinberg, Ofvers. af Kongl. Vetensk.-Akad. Forhandl. 1867, 



p. 53. 

 Body long, depressed, segments rectangular ; cephalic lobe 

 rounded, caruncle elongate, rather smooth ; eyes, tentacle, an- 



