Miscellaneous. 315 



are placed in the anterior region of each segment, starting from 

 the thirteenth or fourteenth setigerous segment. The fecundating 

 elements detach themselves from these glandular bodies, and are 

 received by two vibratile chambers, situated one to the right and the 

 other to the left of the intestine, in the posterior part of the segment 

 and above the transverse septum. A deferent duct forms a con- 

 tinuation of each of these vibratile funnels. This canal pierces the 

 septum and penetrates into the following segment, where it becomes 

 inflated into a seminal vesicle opening at the base of a very pro- 

 tractile conical penis, which projects from the dorsal surface a little 

 beyond the feet. There are consequently two penises for each 

 zoonitc, and the organs for conducting the semen are arranged exactly 

 in accordance with the plan of structure of the segmental organs ; 

 the deferent ducts are moreover replaced by true segmental organs 

 in the anterior region of the body. 



In the females the ovaries occupy the same position as the testes 

 in the males. Beneath them we notice a yellowish sac full of 

 spermatozoids. This organ, a true copulatory pouch, communicates 

 by a vaginal duct with an aperture situated on the ventral surface 

 of the same segment. Hence we find on each female segment two 

 ventral vulvae corresponding to the two dorsal penises of the males. 

 But we have also distinguished in the females two vibratile ducts 

 situated in the dorsal region, and piercing the septum below the 

 copulatory pouch. These organs, evidently homologous with the 

 deferent ducts, must be regarded as oviducts ; but we have been 

 unable to determine exactly the relations of the copulatory pouch 

 with the general cavity. We have also to notice the remarkable 

 degradation of the pedal organs of Saccocirrus, which are formed by 

 tubes which can project more or less, or be retracted entirely within 

 the body ; in these protractile sheaths there are seven or eight very 

 simple setae. 



The tribe Trichobranchidea of Malmgren is represented in the 

 coralligenous bottoms of the coasts of Provence by a Terebellian very 

 ncarly related to the Tricliobranclms of Spitzbergen, but furnished 

 with eight filiform branchiae. This worm will become the type 

 of a new division : its first four segments bear a membranous frill 

 covering the ventral surface, and in part passing over to the dorsal 

 region. 



Lastly, we have been able to study some Serpulea, and chiefly two 

 species of Apomatus, the general structure of which greatly resembles 

 that of Psygmobrandms. The globular operculum of these sedentary 

 annelids, situated at the apex of a branchial filament still furnished 

 with secondary barbules, is a true operculum in course of differentia- 

 tion. The setigerous apparatus of these Apomati is rather complex, 

 but it exactly corresponds to that of the Psygmobranchi. It may 

 be said that the Apomati are Psygmobranchi of which one of the 

 branchial filaments, deviating from its original functions, becomes 

 an opercular axis, just as the Filigranaz are Salmacince with modified 

 branchial filaments. With regard to the last two genera it is curious 

 to find that all the Salmacina? are hermaphrodites, while the Mligrance 

 seem to be generally unisexual. — Comptes Eendus, August 10, 1874, 

 p. 398. 



