7-1 
REPORT— 1847. 
linear tentacles on its dorsal aspect, behind and a little exterior to which are tinre. 
Anus a little behind the centre of the baeV. A single species, Ictii Cocla^fito 
Kalmnutb. The authore propose to unite the genera Elygh, Placobntehit.J^ 
nia, C/Mlidis, /jinapontia and Jetis in a new order, characterized by the sisncfBl 
specialized breathing organs or other dorsal appendages, and for which tier kmor 
the name of PflHbranchiatn. r . r r 
On the Struclure the Larva of certain Acari. 
Bt/ Professor Allman, M.ii.LA. 
^e author demonstrated in the six-legged larva of ilalarachnt J7fl//riffri,AllB., 
a digestive canal which expands on either side into two great cscsl pooches. Tw 
long cicca also may be seen opening into the rectum near its termination, and frao 
this point may be traced forwards on each aide till they enter the basal joints of fc 
anterior pair of legs. A large nervous mass placed beueath the osophagos sails 
jwin ed out, and the founh or poMerior pair of legs, which are afterwurds to bsoae 
eve oped, >fmy be seen in a rudimental condition, confined as yet beneath the iti^ 
^oicn . No trace of tracbeae c»)uld be detected, though these are very ewiMt 
p u • ttpd the author was of opinion that the respiratorv function doesDjtl** 
come specialised till after the development of the fourth pair of legs. 
On the. LocomotivH Larva ^’Plutnatella Fruticosa, 
By Professor Allman, M.D., M.njA. 
show n to possess nearly the same stnicture as a soJitarr adult polrpof 
ndalt*^>*’ “*«tond of being clothed W'ith the corneous polvpaiyoftte 
. th*. muscular polyp-celi, from which it can i'fctrt* 
' is cImpIv ?l *** When com[iietcly retracted, the mouth 0/th« 
aurrniinJ!r..» «’•*?* blit n densely ciliated sui-face is presented bti* 
and is crninemly'tatat'ory*.’'’ PresentB the appearance of a minute 
On J)n-c/opmen£ ofNntoadphys, Ailm., « Genus of Evtonmm- 
By Professor Allman, ?LT>„ MM.IA. 
K. passing from the mite-like form, in which it leave* tbefSi 
each heiirino'’a r.vcephalic segment, succeeded by four distinctsegaats, 
and furnishwl tfue feet. These feet however ai-e still in a rudiineii'^s'*^’ 
form and seligcruus feet of an annelide. IniRS*®’ 
I’f atnicture I* strongly reminds one of theanntfli 3 »ntn* 
and that iu«t however, that between the earlier extiU'Ume ^ 
yet obserred In n are certain intermediate phases which 
place bftwerii flto advanced stage it was shown that a coalescence lad 
mXwy .„d the regtoa of the Wv.»^ 
chamber; TlieleffB "^^*«ch is destmed to support the great dorsal 
adult, nil? next actjmrcd neorlv the fonn whicl thev pos?*®^ 
animal. In "hU thffiSiw''JL Allman is that of the fnlMjf^ 
cephalic region and thpr!. ^ segments bearing true feet has coalesced 
I»c>rtiDg natulorv feet distinct 
iKmerior din-ption <1 1 couaolidation has been going on in die sJit^ 
d..^r;;iiimu ^ecn m%eLion;fortte ?«5 
two distinct Dortifma vrliich in the second of the obser\-ed phases fc®***^. 
third and fourth A<i«i>n another along the mesial line, la**® 
cd the condition of a solitary organ, dorsal and nieih*®' 
On the Genera Nebalia (Leach), Chiroct-pbalus (Frevost), nW 
Unonan .. ■ i?y Dr. Baird. 
® ntive examination of the species of the genus Nehdia, descrilwl^ 
