156 CALIFORNIA ACADEMY OF SCIENCES. 
mens 20 em., while the width is about 54 mm. posterior to clitellum. This and the 
following species are the longest forms so far known of the genus. The worms are 
not remarkably lively when out of the ground. 
Sade. The couple 3 and 4 are distinctly dorsal, and it may be of interest to 
note that in all species found in America the dorsal portion of these setee appear 
characteristic, while in Sp. tamesis the setee 3 and 4 are ventral or sublateral. I can 
find no character in the form of the sete in the various species. They are allslightly 
sigmoid, slightly hooked and devoid of ornamentation. There are no penial sete and 
no modified sete in any part of the genital region. The sete of Sp. tamesis as figured 
by Benham are more hooked than those of my new forms. 
Prostomium and pygidium. I cannot find any good characters in the form of 
these part in the respective species. The small pit in the prostomium of Sp. tamesis, 
deseribed by Benham, is found in all the species. The pygidium yaries greatly. 
While some specimens have the anal orifice elevated and dorsal others have it central. 
The shape and size of the last somite varies also to such an extent that no species 
character can be derived from it. I will then in the following not refer to these part 
in any of the species described below. 
Clitellum. In all the species of this genus the clitellum is very large, oecupy- 
ing from 8 to 15 somites. In Sp. Smithi it is located as follows: dorsally, $xvi-}xxviii; 
ventrally, xix—xxy. Continuous all around the body. In all preserved specimens 
the body is bent towards the ventral side just at the clitellum, and special pains must 
be taken if a straight specimen is desired. 
Tubercula pubertatis consists of a very elevated, continuous ridge, which is 
broken or depressed at the intersegmental grooves. It extends through somites 
xix—xxvil and is situated dorsally to the spermiducal duct and its pore. The ridge is 
further generally concave on the dorsal and convex on the ventral side. The ventral 
area between the two tubercula pubertatis ridges is thus much wider than in any of 
the other three new species described here. Anteriorly the tubercula pubertatis 
ridge is continued forward in a kind of semicircle which ends at the groove between 
somites ix/x. But these anterior ridges are much lower than the tubercula pubertatis 
proper, but nevertheless very sharply defined and distinct. 
Spermiducal pore is situated between xix/xx, laterally to the sete 1 and 2 and 
about three times as far from 2 as 2is from 1. But the pore is ventral to the tuber- 
cula pubertatis ridge. This is an important characteristic and only shared with Sp. 
sonore. In Sp. tamesis, Kiseni and Benhami, the spermiducal pores are dorsal to the 
tubercula pubertatis ridge. 
Oviducal pores are plain in front of sete 1 and 2 on somite xiy. 
Prostate pores externally not visible, but situated in front of setee 1 and 2. 
Somites. All the anterior somites are three-ringed, except i, ii, ili, which are 
smooth. 
Dorsal pores. The most anterior pore is situated between i/ii, and the most 
posterior one between xii/xiil. 
