l.">ti CAI.IKOHXIA ACADEMY OF SCIENCES. 



inen.s 20 era., while the widtli is about 3A rarii. posterior to clitelhim. Tliis and the 



follow ill"; species are the loiii^cst forms so far known of the iioiiiis. The wunns are 

 not renuirl<al)ly lively when out oi the j^roiiml. 



Seta. TIk' couple '•> ami I are distinctly dorsal, and il may he of interest to 

 note lli;it in nil species fonnd in America the dorsal portion of these setae appear 

 characteristic, while in <S//. t(im(.-sl.s tiie seta' 3 and 4 are ventral or suhlateral. T can 

 lind no character in the form of the settc in the various specie-;. They are all slightly 

 sigmoid, slightly hooked and <levoid of ornamentation. There are no penial setteand 

 no modified seta' in any part nf the genital region. The setie of >//. finnesis as figured 

 by Benham are more hooked than those of my new forms. 



Prdslomiini) and /i>/i/i(U)i)u. I cannot find any good characters in the form of 

 these i«ut in the i'es])ective species. The small pit in the pro>tominm of Sp. tniiuKu^, 

 described by Benluim, is fonnd in all the species. The pygidium varies greatly. 

 While some specimens have the anal milice 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. 



CliteUuni. In ;ill the species of this genus the clitelhim is very large, occupy- 

 ing from 8 to 13 somites. In Sp. SDiithi it is located as follows: doi'sally, ^Twi-ixxviii; 

 ventrally, xix-xxv. Continuous all around the body. In all preserved specimens 

 the bodv is bent tow'ards the ventral side just at the clitelhim, and .special pains must 

 be taken if a straight specimen is desired. 



7'uberciila puhertnlls. consists of a very elevated, eontimioiis ridge, which is 

 broken or depressed at the intersegmental grooves. It extends through somites 

 xix-xxvii 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 tubereiila pul)eitatis ridges is thus niueh wider than in any of 

 the other three new species described here. Anteriorly the tubereiila pubertatis 

 ridge is continued forward in a kind of semicircle which ends at the groove between 

 scHiiites ix/x. But these anterior ridges are much lower than the tubercula pubertatis 

 proper, but nevertheless very sharply defined and distinct. 



Spernndiic'i/ jmre is sitiaited between xix xx, laterally to the sette 1 and 1* and 

 about three times as far from 2 as 2 is from 1. Uut the pore is ventral to the tuber- 

 eiila pubertatis ridge. This is an important characteristic and only shared with Sp: 

 fiOHor'i . In S/j. tiiiiu:^ls, Klsvni and iJcn/uinii, the .spermiducal pores are dorsal to the 

 tubercula pubertatis ridge. 



Oriihii'iil p<iris arc plain in front of seta' 1 and 2 on somite xiv. 



Prostiite jjons externally not visible, but situated in front of seta' 1 and 2. 



Snvi'dcs. All the anterior somites are three-ringed, except i, ii, iii, which are 

 smooth. 



Dorsal pores. The iiio-t aniciior pore is situated l)etween i ii, and the most 

 posterior one between xii/xiii. 



I 



