240 DB. BAIHd's CONTE.IBUTIONS TOWARDS A 



larger than antennae or palpi. Body attenuated at each extre- 

 mity and composed of about 32 segments. Branchiae rather 

 small, arbusculiform. Setse of feet all alike, slender, subulate, sim- 

 ple, rather long. The organs {pores of Audouin & M-.Edwards) 

 placed on each of the abdominal segments, on each side, are com- 

 posed of a depression with a somewhat corrugated raised border 

 round it, and having in the centre of the depression a series (5 

 to 7) of short fleshy-looking uncinate setse or spines. 



Are these organs organs of apprehension ? The specimens 

 of Audouin and M.-Edwards are simply mentioned aa having been 

 found at Port Jackson by M. G-audichaud. The specimens which 

 we possess in the Collection of the British Museum are described 

 as having been found (some) amongst barnacles on a log of ship 

 timber, others as having been concealed in the valves of Lepas 

 fasciQularis in lat. 16° 0' S., long. 5° 0' "W., and a third set aa 

 from Madeira. By means of these organs I think it probable 

 that they can attach themselves to other bodies partly as pa- 

 rasites. If this be the case, it is curious that in many of the 

 specimens we possess there should be attached to their under 

 surface small animals which are doubtless parasitic to them. 



Sp. 2. HiPPONOE Ceanchii, sp. nov. (Plate VI. figs. 7-14.) 



In the Museum Collection are two specimens, collected by Mr. 

 Cranch in the Congo expedition, which appear to me to be uu- 

 described. 



The worm is only about half an inch long. The body is fusiform 

 in shape, attenuated at either extremity, and composed of about 20 

 segments. The head is small, but the mouth is very large com- 

 pared with the size of the animal. The tentacle, antennae, and 

 palpi are similar to those of the preceding species. Eyes could not 

 be detected. The branchiae are larger and are composed of more 

 branchlets than those of Qaudichaudi. The setae of the feet are 

 short, simple, and setaceous. The organs (? of apprehension) on 

 the abdominal segments are much larger than in the preceding . 

 species, and the fleshy setae are much longer. 



The size of the worm, the comparative size of the mouth, the 

 branchiae, and the organs of apprehension, and the shortness of 

 the setae of the feet distinguish this species very well. The 

 organs (? of apprehension) appear to be niore pi'oduced than in 

 any of the specimens we possess of Gaudichaudi, and the sei* 

 are everl more hooked at the point, thus eonfirrniug my opinion 



