344 THE PBOCEEDINGS OF THE LINNEAN SOCIETY 



ture, and without serrations. The ventral setss have all the same 

 form as the second kind of the dorsal. Both the dorsal and 

 ventral fasciculi are of a golden yellow colour. 

 Hah. Darnley Island. (Che vert Exped.) 



4. — ^NoTOPYGOs PARVUS, sp. nov. 



The length of this species is a little more than half-an-inch, 

 and its breadth about a quarter of an inch. Its form is oval and 

 depressed ; and the number of segments is about twenty-eight. 

 It is characterised especially by the form of the caruncle, which 

 has the appearance of a thick smooth posterior tentacle, its free 

 extremity reaching as far back as the jBfth segment. From the 

 anterior fixed end of the caruncle arises the median tentacle, 

 which is smaller than the antennae, as are also the palpi. The 

 eyes are large and subequal. Two black spots, close together, 

 on the under surface of the narrow prestonium, have the 

 appearance of an accessory pair of eyes. The branchia?, which 

 begin on the third segment, consist on each segment of a few 

 simple filiform processes, usually seven or eight in number, aris- 

 ing in a transverse row from the dorsal tubercle The dorsal 

 cirri are almost uniform in appearance with these colourless 

 branchial filaments. The anal appendages are short and tubercle- 

 like. 



The dorsal setiferous tubercle is broad transversly, and the 

 setae very numerous ; the ventral setae are fewer, and placed close 

 together. All the setae, ventral, and dorsal, possess the same 

 form. They are straight, smooth aciculae, bifurcated at the tip ; 

 the shorter branch being less than half the length of the other, 

 straight, and rather blunt ; the longer branch has a sudden bend 

 outwards, opposite the apex of the shorter branch, and from that 

 point tapers to the extremity, with a slight curve inwards. 



The two species above described are referred provisionally to 

 the genus Notopygos. This genus contains hitherto only two 

 species — Notopygos cimitus, Grube, and N. ornatus, Grube ; and 

 one of the generic characters given by Kinberg is a slight ser- 

 ration on the inner side of the longer branch of the dorsal setae. 

 This serration is entirely absent in the case of the two species I 



