} 
170 MR. CYRIL CROSSLAND ON THE Feb. 47, 
The gratitude of all zoologists is thus due to Sir Charles Eliot, 
whose generosity and scientific zeal have enabled these collections, 
the first of considerable size from this region, to be made. I 
wish also to express my best thanks to Mr. Stanley Gardiner, who 
helped me by his advice and in every other possible way, both 
during my residence in Hast Africa and in the working out of the 
collections on my return to England. 
CHAHTOPTERIDS, 
Genus PHYLLOCH ©TOPTERUS. 
The position of the genus Phyllochetopterus among the lower 
Cheetopteridx is shown by the following table of the genera :— 
A. Notopodia of the second body-rezion not foliaceous 
(z. e. two body-regions only) ................. RANZANIA. 
B. With foliaceous notopodia posteriorly. 
1. Body divided into two regions ..................... LELEPSAVUS. 
2. Body divided into three regions. 
; One pair of tentacles ........................... .. SPIOCHETOPTERUS. 
AUG JORNERS Cue WIUEVOTES |... cs,cponon ondcoo ganado sue boo PHYLLOCH ETOPTERUS. 
The most characteristic feature of the Chetopteride is the 
adaptation of certain parapodia for the production of a respiratory 
current, which modification, completed in the genus Chetopterus, 
makes the latter one of the most remarkable forms of animal life. 
This pecuhlarity is not developed in Ranzania, whose only 
Chetopterid features are its general build of body, which is 
divided into an anterior flattened muscular and glandular portion 
bearing long notopodial setz only, and a rounder weaker posterior 
portion with delicate notopodia and neuropodia of uncinigeral 
tori; in addition it is tubicolous in its mode of life, and procures 
food by the ciliated grooves of its tentacles and dorsal surface. 
To these features are added notopodial gills in Telepsavus, in 
which case they are developed on every segment of the hind-body. 
In the remaining two genera this modification is restricted to 
more or fewer of the middle segments, to two only in Spiocheto- 
pterus and several species of Phyllochetopterus, but up to 25 in 
other species of the latter. 
Tn all the eight species of Phyllochetopterus yet known the 
body is vermiform, the notopodial gills comparatively small and 
simple, bifid, and containing capillary sete. All the sete are 
characteristically Cheetopterid, in the first region long with leaf- 
like ends, and arranged in a row as in Chetopterus, though the 
notopodia of P. aciculigerus alone approach in their long pointed 
shape those of the former genus. In the fourth notopodium of 
the first body-region one or more sete are enlarged and of a dark 
brown colour, but are not flattened as in Chetopterus. The uncini 
are of one kind only throughout the body, but their form is more 
specialized than in Cheetopierus, and is that which occurs in, for 
example, the Sabellidee. The parapodia are alike in all the species, 
differing only in the proportions of the parts, excepting the hind- 
body notopodia of P. aciculigerus (6). 
