482 MR. F. E. BEDDARD ON THE 
TEMPLETON’ is entirely misunderstood by ScHMARDA,* who makes him respon- 
sible for the statement that only a dorsal row of setz is present, and LEON 
VAILLANT, in a workt which will be alluded to at greater length presently, 
falls apparently into the same error. In my annelid there is in addition a 
ventral area on which no setz are developed, and this is rather more marked 
than the dorsal area, from the fact that it is perfectly regular and sym- 
metrical, while in the former the setz leave off at different distances from the 
median line in different segments, which causes it to appear rather less con- 
spicuous than the ventral area; but at any rate an observer who noted the 
one could hardly fail to note the other. Moreover, in Megascolex, the genera- 
tive organs are described as occupying the 16th, 17th, and 18th segments. 
SCHMARDA appears to consider that this description refers to the clitellum, 
which he accordingly states, on the authority of TEMPLETON, to be developed in 
those segments; in the annelid to be described here, the clitellum occupies 
about seven segments commencing after the 12th, and the testes are developed 
in the 12th: hence I have no hesitation in regarding this annelid as quite 
distinct from Megascolex coeruleus. 
Whether ScuMarpa and myself are describing the same animal or not is 
rather difficult to say; I am on the whole inclined to suspect that we are, 
from the similarity of the colour ; the absence of the clitellum and the number 
of the segments may be accounted for on the hypothesis that the specimen 
described by SCHMARDA was a young one. But whether this is so or not, a 
careful study has convinced me that this annelid cannot be classed with the 
genus Pericheta, since their affinities, which will be pointed out later on, are not 
of so close a character as to warrant the inclusion of the two types in the same 
genus ; accordingly, I have placed it in a genus by itself, and propose for it the 
name Pleurocheta Moseley. The generic name serves to express the most 
important external character, viz., position of sete in two lateral groups ; the 
species I call after Professor MosELEy, since it is through his liberality that I 
have had the opportunity of studying it. : 
I will give briefly the most important facts in the anatomy of this animal 
before discussing in detail its various structures. 
Pleurocheta Moseleyi is about 28 inches in length, and is made up of some 
260 segments, of which from seven to nine are occupied by the clitellum, and 
twelve are pre-clitellian. The sets are developed in all the rings of the 
body, but are more numerous in the post-clitellian region, being there about 
140 to each segment. Sete are present in the ventral part of the clitellum. The 
alimentary canal consists of the ordinary divisions, pharynx, cesophagus, 
* Loe. cit. 
+ “ Note sur Anatomie de deux espéces du genre Pericheta et essai de classification des Anne- 
lides Lumbriciens,” Annales des Sciences Naturelles, 5th series, vol. x. 
, eS . —— 
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