36 Prof. M'Intosh's Notes from llie 



The swarming takes place during the months of October 

 and November, usually at four different periods, each lasting 

 a few days ; the periods falling on nights close to the appear- 

 ance of the new and the fidl moon and just after flood-tide. 



The Japanese " Palolo " therefore differs from both the 

 Pacific and the Atlantic forms not only in regard to the 

 family, but in the nature of the reproductive process, since 

 in both of the latter a specially modified posterior region — 

 bearing the sexual elements — is separated and swims freely, 

 ■whereas in tbe Japanese species the specially modified pos- 

 terior region degenerates and is shed — the enlarged anterior 

 region swimming actively, discharging its sexual products 

 and then perishing. 



Mr. Akira Izuka's paper is illustrated by woodcuts and a 

 coloured plate, the finish of which is in keeping with the 

 excellent illustrations in the ' Economic Fishes of Japan,' by 

 Otaki, Fujita, and Higurashi. 



It is probable that the number of forms exhibiting similar 

 features to the ^' Palolo " will be increased as observations 

 extend. 



All the foregoing belong to the temporarily pelagic group, 

 which maybe divided into two sections : (1) those which, as 

 larvffi of reptant or fixed forms, rise to the surface and by- 

 and-by return to the bottom ; and (2) those which may come 

 from the shore or the bottom {e.g. epigamous forms) and do 

 not return thereto. Under the latter " Palolo '' and the 

 allied forms fall. 



2. On the British Goniadidse^ GlyceridcC, and Ariciidae. 



The British Goniadidse in Dr. Johnston's ' Catalogue' of 

 the Britisli Museum included but a single species, tliough a 

 second was known shortly after its publication. The view 

 of Ehlers that Goniada and Glycinde [Eone] should form one 

 genus has certain recommendations, but it should be remem- 

 bered that the structure of the dorsal division of the foot, 

 both in soft parts and in bristles, shows a decided divergence, 

 and the same may be said of the teeth. Moreover, Ehlers 

 does not mention that between the body-wall of each of the 

 common forms ( Goniada maculata and Glycinde Nordmanni) 

 there is this difference, viz., that in the latter the dorsal longi- 

 tudinal muscles have a well-marked fold inferiorly, whilst in 

 the former such is absent. Ehlers, in 18(58, grouped them 

 under his Ghjcera j>olyynatha and separated them by the 

 condition of the teeth. 



In considering the species of Glyceridse mentioned in the 



