POLYCH.ETA. 275 



The prostomial tentacles are somewhat pigmented, especially at the base, where the 

 long flagelliform portion is inserted into the 10- or 12-ringed basal peduncle. The 

 frontal antennas have a stout pigmented basal portion, followed by a narrower apical 

 portion, the whole as long as the peduncle of the lateral tentacle. The tentacular 

 cirri arising from the border of the single apodous buccal segment are as long as the 

 peduncles of the submedian tentacles, or slightly longer. The eye-tracts occur behind 

 the submedian tentacles. The broad rounded palps have a teat-like apex. In the 

 protruding jaws I counted 8 teeth on the right saw, 7 on the left, about 10 on the 

 right arc, 8 or 9 on the left, and 5 teeth on the left iinpar. The lower jaw-plates or 

 laminae ventrales have thin white calcareous end-pieces with simple border and 

 rounded divergent apices ; the mandibles have the usual form (Plate IV., fig. 95). 



This species is closely related to Diopatra neapolitana. Its differentiation from any 

 other species of the genus will probably depend upon the character of the setae in the 

 anterior modified parapodia, about which our information is rather deficient, so far as 

 I am able to judge from the literature of Diopatra. It is equally closely related to 

 Diopatra semperi, Grube (' Ann. Semp.,' p. 282 = D. luzonensis, p. 138), but the 

 latter has very short frontal antennae and the calcareous caps of the lower jaw-plates 

 are trilobate ; the anterior setae are not described. The identification of the present 

 species cannot be considered final until fresh material for comparison is obtained from 

 Amboina or adjacent parts. A preparation of the first left foot of D. amboinensis 

 from Ceylon shows about 18 setae projecting. There is a dorsal group of about six 

 long, simple, curved acuminate, non-limbate capillary setae ; the rest have a bidentate 

 apex beyond which the pointed guard projects (Plate IV., fig. 96-97). The anterior 

 appendages possess other characteristic features besides the setae which they carry. 

 The lips of the orifice of the pharetra setarum are triangulate, an anterior short 

 truncate border followed by a long stout cirriform posterior median lobe and a 

 smaller ventral ligule ; I do not know of any other species of Diopatra in which this 

 third ligule has been described. Sometimes it is ajjpressed against the median lobe 

 and so concealed from view on the slide, but it can be found with a simple lens on 

 the body of the worm. In Grube's description of D. semperi (= D. luzonensis) the 

 diagnostic features of the anterior modified parapodia are not given. From the 

 parapodia of the mid- and hind-body two aciculae project with bifid apices as 

 figured by Ehlers (' BorstenwiArmer,' Taf. xii., fig. 15) for D. neapolitana. The 

 scalprate setae of the posterior segments have numerous fine denticulations (over 20), 

 whereas according to Ehlers they are few (about 8) in D. neapolitana. The fila- 

 ments of the branchiae are long. 



Onuphis basipicta, n. sp. Plate IV, figs. 98 and 99. 



Station XXXV., Galle, 7 fathoms. One specimen in company with Glycera 

 lancadivce. Length 23 millims., width 1 millim. 



Patches of brown pigment on the bases (ceratophores) of the antennae ; submedian 



2 N 2 



