680 MR J. T. CUNNINGNAM AND MR G. A. RAMAGE ON THE 



Specific Characters. — Two minute eye-specks, just in front of the pits, 

 whence the ciliated processes proceed. 



As was pointed out by Claparede {Annelides Cheteopodes du Golfe de 

 Naples), the male genital aperture is single, situated between the 8th and 9th 

 somites, and the notopodial setae of these somites are modified for copulation. 

 These setae are long, thick, and bluntly pointed ; there are 4 fascicles of them, — 

 the 4 notopodial fascicles of the two segments, which have been shifted towards 

 one another and towards the median dorsal line. In one male specimen, we 

 investigated by examination, under the microscope, after compression, the 

 distribution of the two kinds of setae, with the following result: — In the 

 neuropodia of the 8th and 9th somites, sheathed uncini only present. In the 

 6th somite, the notopodium has one uncinus on the dorsal side, the other setae 

 being all subulate ; in the neuropodium all the setae are subulate. In the first 

 5 somites there are only subulate setae. Behind the 9th somite, sheathed 

 uncini only present in both neuropodia and notopodia. 



There seems to be still some doubt as to the process of copulation and 

 reproduction in Capitella. Van Beneden has regarded a pouch in connection 

 with the genital opening in the male as testicle, but Claparede doubts this 

 interpretation. According to Claparede, there are a pair of ovaries in the 

 females in each segment, except a few of the most anterior. It is probable 

 that the semen is somehow retained by the female near the genital opening, 

 and the ova fertilised as they are expelled. 



There are several segmental organs in each of the segments behind the 

 genital opening, except the most anterior. These have been described by 

 Eisig in "Die segmental organe der Capitelliden," Mitth. Zool. Stat. Neapel, 

 Bd. i., 1879. Pie says that, previously to his paper, of the generative apparatus 

 of Capitella capitata only the greifhaken of the $, discovered by V. Beneden, 

 and the pores of the female discovered by Claparede, were known (V. 

 Beneden, Bull. Acad, de Belg., 1857, iii., Nos. 9 and 10; Claparede, 

 Annelides Chetopodes du Golfe de Naples, p. 274). 



Claparede, loc. cit., says it is easy to find the sexual pores of the females, 

 which are in the form of transverse clefts, on the ventral surface between the 

 7th and 8th somites, a little internal to the line of the " external " fascicles of 

 bristles. 



Claparede was apparently aware that the copulatory setae were dorsal. 

 He speaks of these setae as the internal fascicles of bristles transformed; and 

 in speaking of the ventral female pores, he says they are internal to the 

 external bristles. Eisig found that the pair of ventral pores described by 

 Clapapede occurred in both sexes, and were in both the apertures of internally 

 ciliated tubes ; these tubes, if homologous with segmental organs, belong to the 

 8th somite ; the 7th and 9th somites have nephridia in the larva ; the 8th, none 



