74 



CAPITELLID^E. 



in fresh water and which he terms Eisigella onanaryensis. The anterior region (thorax) 

 consists of twelve segments, and there are no branchiaB, no copulatory apparatus, and no 

 genital pores. He 1 also notices a peculiar type of the family from the Red Sea, viz. 

 Scyphoproctus djiboutiensis, in which the anterior region has fourteen segments, whilst the 

 tail is expanded into a trumpet with two ventral cirri, the edge of the trumpet having 

 groups of acicular bristles. 



Nusbaum 2 (1905) was of opinion that in Gapitella regeneration was as frequent as in 

 the Spionida3. Michel 3 (1901), on the other hand, kept the posterior regions of two 

 examples for two and four months without any attempt at regeneration, so that it must 

 take place slowly or under special conditions. 



In this and other families of annelids Prof. Stephenson, 4 of Lahore, has carried out a 

 series of investigations on the antiperistaltic movement of the gut posteriorly and its con- 

 nection with intestinal respiration, and even nutrition. 



Xn. 



Fig. 131. — Nephridium of Notomastus lineatus, Clap., after Dr. Eisig 1 . NmC. Nephridal canal. 

 NmOn. Concretion. NmT. Funnel. NmM. Nephridiopore. 



The segmental organs (Fig. 131) have true trumpet-like openings in the septa. The 

 genital funnel in some forms (e. g. Dasybranchtis caducus) is quite independent, acquires at 

 maturity a pore to the exterior, and functions exclusively as a genital duct. In others the 

 edge of the lip of the genital funnel may become connected with the septal trumpet of the 

 segmental organ (Dasybranchus gajolx and Tremomastus), but even in this case the funnel 

 still develops an opening to the exterior for the genital products. In Glistomastus, where 

 the products escape by rupture of the body-wall, the funnels are found only in a more or 

 less rudimentary state, and do not normally open to the exterior (Goodrich, 5 who shows 



1 'Bull. Mus. Hist. Nat./ Paris, t. x, p. 557. 



2 ' Zeitschr. f . wiss. Zool./ Bd. lxxix, Taf . xiii — xvi. 



3 'Bull. sc. Fr. et Belg./ t. xxxi. 



4 « Trans. Roy. Soc. Edinb./ vol. xlix, pp. 787, 802, etc. 



5 ' Quart. Journ. Micr. Sc./ n.s., vol. xliii, p. 727. 



