rOTTS— POLYCH.ETA. 31-7 



The ventral surface and the neuropodium are always covered to a certain extent by 

 long ciliary processes, which may occur so thickly as to suggest the pile of a carpet. 

 Amongst these are smaller spherical tubercles, and the relative proportions of the cilia 

 and tubercles appear to afford material for estimating specific differences. 



The shape of the ventral setae offers anotlier apparently trustworthy criterion. 

 Unfortunately both the elytra and the setae are not described with sufficient conciseness 

 by the earlier writers, such as De Quatrefages and Kinberg. 



28. Fsammoltjce farquharensis, sp. n. (Plate 19. fig. 21; Plate 21. figs. 58, 59.) 



Measwements. Length 86 mm., breadth 9 mm. ; no. of segments 128. 



Tentacles borne by the large transversely wrinkled ceratophores, small and slender, 

 hardly equalling in length the head and ceratophore together. Anterior ventral 

 corners of the head occupied by two large eyes ; dorsal to these, but still anterior, 

 another pair, smaller, but still distinct. (P. arenosa, which in many ways resembles 

 this species, differs in possessing but a single pair of eyes.) Nuchal fold well-developed, 

 but leaves most of head uncovered *. Palps moderately long. 



Buccal segment (as is usual in this genus) partly enclosing head, and bearing only 

 dorsal setae of plumose type. Buccal cirri lying ventrally with regard to the setae, of 

 about the same length as tlie tentacles. In second segment an upper series of stout 

 ventral sette with markedly spinose shafts, and fairly long appendices with incurved 

 apices and spurs rising beneath; lower series much slendei'er, also with spinose shafts 

 a.nd very elongated appendices, approaching the type figured by Willey for same position 

 in P. zeylanica, but apex of the appendix incurved and possessing a distinct spur. 

 (The vei-y slender character of the ventralmost setae in the second segment and possession 

 of a filiform appendix is a character also of P. arenosa, though not noted by Cluparede.) 



The fifth segment, upper ventral setae (fig. 59) modified so that shaft is never spinose 

 and appendix exceedingly short t, rarely possessing spur beneath apex. In some of the 

 shorter setae of the bundle appendices longer and apices with spurs. Ventralmost setae 

 (fig. 58), though still slender, larger with smooth siiafts and shorter appendices ; spurs 

 under the apex often lost. These types of setae found throughout the body. 



Eirst elytron distinguished by size, rather triangular shape, and possession of very 

 short, thickly placed, capitate papilltB. In succeeding ones (fig. 21) two processes 

 directed toward median line closely set with papillae ; in posterior segments these 

 structures not found : also posterior club-shaped appendage, crowded with papillae. (In 

 this point a resemblance may be detected with P. arenosa, in which this latter 

 structure always occurs, in fact Claparede figures an elytron also with one or two smaller 

 ones.) 



Ventral surface beset with long ciliary processes ; globular papillae not present in large 

 numbers. 



Locality. Farquhar AtoU, lagoon. Single female with eggs. 



* The nuchal fold formed by the first segment in P. arenosa completely covers the head. 



t The stumpy nature of the appendix appears to have been accentuated in many cases by attrition. 



