624 
VERMES. 
dorsal and ventral vessel, which partially almost rest on the intestine and 
communicate through vascular plexuses with the numerous annular ves- 
sels of the intestinal tube ; delicate “ retiamirabilia^’ are diffused in the 
septa and spun around the ramifications of the intestine and the seg- 
mental organs, close to each of which there exists a vascular dilatation. 
The eggs are developed on the external surface of the free portions of 
the vascular net, the cellular peritoneal investment of the vessels form- 
ing the membranous covering, through the rupture of which the eggs are 
set free, floating in the abdominal cavity. . 
Perrier (11) discovered at Roscoff a remarkable worm partaking of 
the characters of Annulata and Nemertea^ which he describes as Pohj- 
gordius (?) villoti. It is thin, thread-like, very lively and fragile, without 
bristles or external annulation, als 9 almost deprived of external vibratile 
cilia ; it has a very simple digestive tube, but a distinct internal septa- 
tion, segmentary organs, a dorsal and ventral (?) vessel, connected by 
lateral loops in each segment. The anterior extremity terminates in 2 
small, horn-like bifurcations, and has a vibratile pit on each side. The 
sexes are separate, and the sexual elements are developed in all the 
rings behind the first 4 or 5, on the internal surface of the body-wall 
and on the longitudinal dissepiments. A very similar, perhaps identical, 
type was described some time before by McIntosii (2, a), after specimens 
dredged in Bressay Sound, and provisionally placed in the vicinity of 
the Opheliidce. The existence of 2 eyes in Linotrypane apogon and the 
want of circular muscular fibres are the most striking differences between 
the published preliminary descriptions. Certain new Opheliidoi with very 
minute or almost invisible bristles are thought to offer the nearest pas- 
sage between the new genus and the typical Chcutopoda. 
S. L. Schenk, “ Entwickelungsvorgange im Eichen von Serpula nach 
der kunstlichen Befruchtung,” SB. Ak. Wien, Ixx. 3, pp. 287-300, pi. 
Genera and Species, 
Grube (1) reviews critically the genera and species of Hermionea 
and Sigalionina. The following genera are acknowledged : — Hermionea ; 
Aphrodite^ Lcetmonice^ Aphrogenia^ Pontogenia^ and Hermione ; Sigalio- 
nina ; Pholoe^ EulepiSy Sigalion, PsammolycCy SthenelaiSy Leanira^ and 
Conconia. 
Milnesia nuda, Qtrf., is probably the young of Aphrodite aculeata ; 
Panceri (8), p. 12. 
Aphrodite sondaica^ sp. n., Grube (1), p. 64 (Borneo). 
Lmtmonice violascenSy sp. n., id. (1) (China Sea). 
Hermione hicolor (Red Sea), H. malleatay p. 68 (Philippines), id. 1. c. 
spp. nn. 
Pontogenia indica, sp. n., id. 1. c; (Singapore, Bohol) ; P. chrysocoma 
(Baird) {Aphrodite echinus, Qu.), Marion & Bobretzky (5), p. 3. 
Polynoe gruhiana. Cl., Marion & Bobretzky (6), p. 6 (P. dorsalis, Qu.), 
according to Marenzeller (3), p. 129, = Lepidonotus clava, Mont., P. scu- 
tellata, Risso, Eumolpe squaniata, D. Ch., P. clypeata, Gr., and P. modesta, 
Qu. ; P. turcica, sp. n., Panceri (9), p. 15, pi. iii. figs. 7-12, and pi. iv. 
