ISOFODA. 21 



The sccotnl aiitciiiiii .ilsn has a pcdimclo of tlnci' juiiits uliicli pinf^rcHHivfly 

 <1orroa.sc ill stoutnoHH Iml iiicrciiso in Icii^mIi. Tin- iniilti-arl i'lilalc (la^^folliiin is of 

 soiiio loii<;tli. 



The maiidililo is vory Htrong ami pioviilfd with a four- jointed palp. Tiiat, 

 of the loft nido of tho animal ha.s a Htrai<j;lit cutting' odjro, bovollc<l (interiorly and 

 po.stcriorly prolongod into u Ht-oiit Hpiir of .some longlli. Tho ontting odgi; i.s IioMowimI 

 out internally to receive the maruliMo of the opposite sido, here there in no Hpnr, 

 and the cutting edge in cloft to form two very stout tooth. This is as examined 

 //; situ. Tho palp i.s frjur-jointcd, l)ut the first is extromcly short, tho proportions of th(! 

 others hoing 5. 7'f). Sf). The second joint has the distal half of its external hordor 

 provided with somewhat spoeiali.sed .sette, the longest are at the heginning c)f the 

 series, and speaking broadly there; are only two sizes. The tenninal joint is curved, 

 fringed throughout its iniior horder with stout sotsu ; these gradually iruMou.so in length 

 distally and tho joint terminates with three long (dies. 



The first maxilla (fig. 2) ha.s a small Imt irregularly shaped iiiiisti<:atory loin; ; 

 its outer horder {trojoots forward as a hroad lobe, its inner and lower liorder, whiih is 

 rounded and (•onsifloralily larger, hears three vary largo spinous prooossos ; of these 

 the most posterior is longest and most slender; each has a thick tuft of line setiu 

 about the middle of its length where the spine is distinct as such from its basal 

 process. The outer lobe is large, arched towards the middle; line, its margin there being 

 almost straight. This is armed with cloven very strong spines though their lonetli 

 and strength is variable. ,\t tho lower inner angle there are two small spinous 

 tul)eroles, one bearing five small spines arranged like the prongs of a fork, the other 

 has only two spines. 



The .second maxilla (fig. .'{) has a short and broad masticatory lobe ; this has a 

 slightly roumled internal margin armed with nuiiiorous long anil strong sot;e. Three 

 seta3 near the posterior angle arc vi'iy much longer than any of tho others, and 

 become plumose by the presence of hair-like structures. Tho remainder of the; seta3 

 do not vary greatly in size, an<l all except thf)so near the anterior angle are, to some 

 extent at least, plumose. Two lobes arise from the outer part of the mastiwitory lobe, 

 the inner one is the broafh-r and of an elongated ovoid form ; the inner border and 

 distnl extremity is provide<l with long and stout siiiifilo seta; of two distinct sizes, and 

 form two rows along the inner margin. TIk; outer lobe is n.iiiow mid icmiiimle- 

 with four htiig simple sctaj an<l two smaller ones. 



The maxillipod (fig. 4) is remarkable for the dispiojiortiou between the 

 maHt'utaU>ry ixnt'um antl the palp. Tho former wunprises a slir)rt but stout joint, 

 the inner margin of which is rounrled proximally, and this is followed bv another 

 short joint wliir;h has a straight inner margin, and from its distal inner angle it 

 slopes rapidly to a muc;li short^-r slightly rounded external niargin ; ihc inner distal 

 margin cjirries four stiff plumo.so seta;, and near llieso is a single prominent tooth. 

 It is behind this that the first joint of the five-joint<;d palp lies. 'J'ho joints of this 



