74 CAMI'OKNIA ACADKMY OF SOIKN'OES. 



External pore!<. Tliere are no dorsal pores. The spermathecal pores are 

 found l)etwec'n .'^oinitcs vii viii and viii/ix in front of seta 2, each one situated on a 

 sligiitly elevated cushion. The ovipore in xiv in front of seta 1. The male pores are 

 in xviii in front of and in line with seta 2 (fig. 2G6 ). The nephropores are in front 

 of seta 2. 



Setre. The setse commence in somite ii, eight in each segment and in couples. 

 The distance between 3 and 4 is only slightly larger than that between 1 and 2. The 

 distance between 1 and 1 is nearly twice as large as that between 1 and 2, and (he 

 distance between 2 and 3 is a little smaller than that between 1 and 1 (fig. 27). 



Colo7- of body pale flesh, rather transparent and marbled very innch like 

 Deltania. Clitellum yellowish. 



INTERXAL ANATO>rY. 



Bodij-icall. The body-wall appears to me to be of unusual thinness, throughout 

 the length of the body. The dorsal side is slightly thinner than the ventral side, at 

 least anterior to the clitellum (fig. 29). Dorsally the longitudinal muscular layer is 

 of about the same thickness as the transverse layer while on the ventral side the 

 longitudinal muscular layer is about twice as thick as the tranverse muscular layer. 

 This refers to the anterior somites. To this there is however an exception in somites 

 viii and ix where on the ventral side in the vicinity of the spermathecal pores the 

 transverse layer is thicker than the longitudinal layer. The transver.se layer tapers 

 down towards the spermathecal pores, but this thickening is found only in the imme- 

 diate vicinity of the sperniatheca. In the clitcUar somites the relative development of 

 the muscular layer is very different. Here the inner or longitudinal muscular la^'er 

 is enormously thickened laterally in somites xvii and xviii or in the vicinity of the 

 male pores (figs. 37, 38, 40, 41), while in the anterior part of the clitellum the longi- 

 tudinal layer is only thickened vontrally, between the inner couples of setfc it here 

 being at least twice as wide as it is dorsally (fig. of)). 



C/t<e^/«?n offers many points of interest. It has already been stated that this 

 organ is incomplete, that is, not simultaneously developed on the dorsal and ventral 

 sides. A section through an immature specimen shows (fig. 38) that the clitellar 

 glandular layer is developed only between the seta, that is, from seta 4 ventrally to 

 seta 4, while donsally there is no trace of such cells. As regards the nature of these 

 cells it is to be remarked that they are unusually small or rather thin compared to the 

 larger and thicker cells of tlie dor.sal part of the clitellum in the anterior somites of 

 that organ. These latter cells offer nothing in particular of interest, resembling those 

 of other genera of the family as far as I can make out. Unfortunately most of the 

 specimens were immature and only two po.sse.sscd clitellum, but these two had unavoid- 

 ably not been treated, and had contracted to such very great extent that the finer 

 structure of the clitellum had been hopelessly lost. From cross and longitudinal sec- 

 tions made it was, however, evident that the clitellar glandular cells, which constitute the 

 (ditelluni. do not extend ventrally further than to setu' 1, thus leaving the ventral space 



