HERMAPHRODITE. 261 



lower whorl. The latter project more, and are externally 

 more pointed, as in the genus Pollicipes. The rostrum 

 is well developed; the infra-median latera, in proportion, 

 are the least of all the valves. The carina is straight and 

 pointed, and not, relatively to the scuta, quite so long. 

 The scuta are rather broader in proportion to their length, 

 which would naturally follow from less having been added 

 to their apices, — these valves at first growing only down- 

 wards. The membrane covering and connecting the 

 valves is furnished with long thin spines. 



Mouth. — Labrum placed far from the adductor scuto- 

 rum muscle, with the upper part exceedingly prominent ; 

 apparently there are no teeth on the crest. Palpi blunt. 



Mandibles, narrow, with four teeth, of which the second 

 is not smaller than the others ; inferior angle sharp and 

 produced, barely pectinated. 



MaxillcB. — Under the two or three great upper spines, 

 there is a tuft of fine bristles ; the inferior part of the 

 edge is step-like, and much upraised. 



Outer Maxillce, with the inner edge deeply notched, 

 and the bristles arranged in two quite distinct tufts ; the 

 bristles on the outer surface are long. Olfactory orifices, 

 thin, tubular, and projecting. 



Cirri. — The first pair is placed far from the second ; 

 the three posterior pair are long and straight, with their 

 segments much elongated, not protuberant, bearing four 

 or five pair of long spines, with little intermediate tufts 

 of minute spines, and with the minutest spines on 

 the lateral upper edges. Dorsal tufts with one spine ex- 

 tremely long, equalling a segment and a half in length ; 

 the others very short. Spines all serrated. First cirrus 

 not very short ; rami nearly equal, with the four terminal 

 segments of both tapering ; all the basal segments much 

 thicker, and thickly covered with bristles. Second cirrus 

 (as well as the third in a less degree), with the anterior 

 ramus thicker than the posterior ramus, and with all the 

 lower segments in both rami thickly clothed with three or 

 four longitudinal rows of spines. 



