BY WILLIAM A. HASWELL, M.A., B.SC. 291 



strongly arcuate near the apex, and in the arched portion are 

 armed with two rows of harpoon-like teeth which vary in size 

 and degree of closeness in different setae. The scale-tubercles 

 are very prominent. The scales are imbricate and decussate, and 

 are covered with short conical projections which at the border 

 are produced into a few short filiform appendages or '' cilia." 



This species is found among mussels between tide-marks in 

 Port Jackson. It is usually tolerably transparent ; but some- 

 times the integument of the dorsal surface is rather thickly 

 pigmented. Various points in the anatomy of this and the 

 preceding species have been alluded to in the first part of this paper. 

 Antinoe ascidiicola, sp. n. (PI. IX., fig. 16.) 



The body contains 37 segments bearing setse. The head is 

 large ; the mesial tentacle is four times the length of the head, 

 ciliated, slender, very slightly swollen near the extremity, the 

 swelling being followed by a slender terminal portion. The 

 lateral prcestomials are scarcely half the length of the outer, 

 tapering, ciliate ; the cilia arranged in rows. Outer peristomials 

 of similar shape to the mesial prsestomials, rather longer, densely 

 ciliate. The feet are divided, though not deeply. The setse 

 are similar to those of the preceding species. The dorsal cirri are 

 long of the same shape as the prsestomial tentacles, and, like 

 the latter and the outer peristomials, brown with white tips ; they 

 are covered as in A. prceclara and A. Wafdii, with larger and 

 smaller papillae, mostly about — oVo-thof an inch in length, but some 

 two or three times that length, consisting of a slender cylindrical 

 peduncle supporting a globular head. The ventral tubercles are 

 distinct. The scale-tubercles are rather prominent ; the elytra 

 ovate, covered on the upper surface with minute conical or 

 cylindrical processes, with a few cilia on the margin : along the 

 margin are sometimes a few pear-shaped vesicles. The length is 

 1:1^ inch ; the breadth ^ inch. 



