626 THE VOYAGE OF H.M.S. CHALLENGEE. 



' brush of filamentary cyliDclers ^ beneath ; the other joints furnished with cilia, and some of 

 them with cylinders ; the accessory flagellum of five joints, of which the first is the longest. 



Lower Antennse. — Third joint as long as first and second united, and but little 

 shorter than the fifth ; fifth a little shorter and narrower than the fourth ; gland-cone 

 prominent, as can be seen when the antenn£e are disengaged from the head ; flao-ellum 

 of sixteen articulations. Feathered cilia on the fourth and fifth joints of the peduncle, 

 besides smooth setae of various sizes. 



Mandibles. — The palp set very far forward ; the cutting edge evenly convex, with a 

 small projection at the top ; secondary plate of left mandible narrow, seemingly a 

 little dentate at its slightly dilated apex ; spine-row of three small spines or stiff 

 curved setse ; molar tubercle with the dentate crown oval, not strongly outdrawn back- 

 wards as in Anonyx cicadoides ; palp with first joint very short, second joint very long, 

 with slight bend or constriction below the centre, and a row of seven spines near the apex ; 

 the third much shorter joint has twelve short spines along the margin, followed by six 

 more successively increasing in length to the ajaex ; not far from the base, at and near 

 the convex margin, there are two or three long setiform spines ; the surface of this joint 

 is as usual striated with closely adpressed cilia. 



Loiver Lip ciliated as usual on the forward apices ; the outer margins and mandibular 

 processes in the specimen figured quite smooth. 



First Maxillse. — Inner plate slender, ovate, apically furnished with two plumose 

 setse, the inner much the smaller ; outer plate broad, carrying on the obliquely truncate 

 apex six dentate spines, and others, probably five, in a second row below these ; the 

 second joint of the palp is laminar, much curved, overarching the outer plate, having its 

 slightly narrowed apical margin fringed with twelve to thirteen teeth pectinate on the 

 outer edge, and one cilium or small seta near the margin. In describing these maxillse, 

 Mr. E. J. Miers^ uses the following words, "the outer lobe strong, truncate, armed at 

 the apex with three or four spines." When the part in question is examined with a 

 low power, this would be the natural way to describe it, but under a high power of the 

 microscope it can be seen that the spines are much more numerous, those actually at 

 the apex numbering six very much crowded together, and in the specimen here 

 described very blunt at the tips. That this bluntness is only the efiect of wear is clear 

 from the sharply-pointed new spines which can be discerned within the plate. 



Second Maxillee. — The plates rather narrow, the outer a little longer than the inner, 

 the apices with the usual fringes of pectinate spines, which pass rather further down the 

 inner margin in the inner plate than in the outer ; on the inner plate the row terminates 

 with a plumose seta. 



The Maxillipeds narrow, not broad at the base as might be inferred from the figure, 



1 By the expression ^femenfary cylinders or cylindrical setx I mean the organs now generally regarded as olfactory. 

 - Loc. cit., p. 8. 



