Miscellaneous. 315 



arc placed in the anterior regiou of each segment, starting from 

 the thirteenth or fourteenth setigerous segment. The fecundating 

 elements detach themselves from these glandular bodies, and arc 

 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 

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

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

 the deferent duets 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 j^ellowish 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 vulvaj 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 o\-iducts ; but we have been 

 unable to determine exactly the relations of the copulatory pouch 

 with the general ca\T.ty. We have also to notice the remarkable 

 degradation of the pedal organs of Saccocinms, 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 seta). 



The tribe Trichobranchidea of Malmg^ren is represented in the 

 coralligenous bottoms of the coasts of Provence by a Terebellian very 

 nearly related to the Tricliohranclius of Spitzbergen, but furnished 

 with eight filiform branchiae. This worm will become the type 

 of a new di\nsiou : its first four segments bear a membranous frill 

 covering the ventral sm-face, and in part passing over to the dorsal 

 region. 



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

 species ofApomatus, the general structure of which greatly resembles 

 that of Psijfimohranchus. 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 Apomafi is rather complex, 

 but it exactly corresponds to that of the Psygmoh-ancM. It may 

 be said that the Apomatl are Psyfjmohranchi of which one of the 

 branchial filaments, deviating from its original functions, becomes 

 an opercular axis, just as the Filigrana' are Sdhnaeina' with mo(Ufied 

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

 to find that all the Salmacina' are hermaphrodites, while the FUujranai 

 seem to be generally unisexual. — Comptcs liendus, August 10, 1874, 

 p. 398. 



