1S8 >lr. n. ^oott on 



lateral process is bare, and lias at its apex a sole-like area, 

 the surfaee of whieh appears difierent to the general 

 surface of the orjrau ; in a balsani-niount under a h\'^\\ 

 power this area has an excecdinjily lincly spotted appear- 

 ance, due to the presence of an extremely dense felt-work of 

 very minute, short, curved set;e (possibly not in any way 

 homologous with ordinary setae or spines, but formed by 

 some kind of breaking up of the general eiiitinous surfaee). 

 A sole-like area, apparently closely similar, is present in 

 the lateral processes of the larva of the allied Kellogyina 

 barnardi. 



Braiic/iial plamenis (PI. IX. fig. "X) arranged in tufts : 

 in the full-grown lar\a there are ten in each tuft, this being 

 apparently the largest number yet recorded in the family ; 

 almost always three ai'e directed forwards, three backwards, 

 and the remaining four ventrally and outwards. There is 

 among the material one much younger larva, only 3'25 mm. 

 long ; it agi*ees closely w ith the larger larvie, so that I have 

 verv little dou!)t it belongs to the same species, l)ut the 

 number of branchial filaments in each tuft is much smaller, 

 being at most six, and sometimes ap[)arently only five. It 

 therefore appears that the number of filaments in a tidt 

 iucrf^a^es with the growth of the larva. A branchial tuft of 

 a full -grown larva, stained with para-carmine and mounted in 

 balsam, shows distinctly that the ten filaments arise in five 

 pairs, the bases of the two members of each pair being ccui- 

 tiguous. It is therefore possiljle that the incre.ise in number 

 of the filaments occurs by a process of fission during the 

 development of the larva. 



Additional supjxjrt is given to the above conclusion by 

 two Lijju>i€aru-]ar\ce preserved in the Cambridge Museum. 

 Tliev were collected in ihe Hhone ^'alley in July 1897 by 

 "\V. Eateson, F.K.S., and are probably Li/joneura cinerascens, 

 Loew, as they agree with Bezzi's description {oj). cit. 1913, 

 p. 77) of that species in all points (except, possibly, that 

 of colour). One of these larvae is only about half the 

 size of the other; and, while the larger one has in each tnlt 

 the number of branchial filaments cliaracteristie of the 

 genus, namely seven, the half-grown larva has ordy four 

 filaments in each tuft. The number of filaments in a tuft 

 is a very important systematic character ; evidently, then, 

 one must beware of being led to false conclusions by the 

 examination only of partly-grown specimens. 



Terminal (i. e., Si.rth) ^Segment (PI. IX. figs. 1,2).— The 

 anterior portion, bearing the lateral processes, is almost 

 identical in form with segments 2-5; its branchial filaments 



