FAUNISTIC NOTES AT PLYMOUTH DURING 18938—4., 233 
month these floating and troublesome algz begin to be converted 
into so many gelatinous balls of motile spores. 
The Diatoms Rhizoselenta and Coscinodiscus also abound, but 
Halosphera disappears until the autumn. 
Among Anthomeduse, Rathkea disappears and Bougainvillea 
takes its place. Amphicodon amphipleurus may also occur. Among 
Leptomedusz, small medusze of Obelia and Clytia are numerous. 
The later stages of Arachnactis are represented. 
Larvee of the Nemertine Cephalothriz may be found. 
It is impossible to speak with much confidence, but there appears 
to be a rapid reduction during this month of the numbers of Nauplit 
and Polycheete larvee. 
Megalops larvee become increasingly numerous. Large Portunid 
Zoxx make their appearance towards the end of the month. 
Plutei are almost the only Hchinoderm larve, and they do not 
seem to be plentiful. 
May.—The formation of spores in Tetraspora proceeds apace, and 
leads to a rapid reduction in the numbers of the alga already notice- 
able early in May. Towards the end of the month the gelatinous 
alga has entirely disappeared. 
The sea swarms with Craspedote medusz, especially with those of 
the Campanularians, e.g. Obelia lucifera of fair size, Phialidiwm 
variabile (?), Thawmantias, and half-grown Irene pellucida. The 
most abundant Anthomedusa is Corymorpha nutans, but Amphinema 
Titania and Tiara octona also may occur. 
Full-grown Ctenophores usually become numerous in the latter 
half of this month; Hormiphora plumosa always, and the magnifi- 
cent lobate form Bolina hydatina in particular years. 
Towards the end of the month Awrelia aurita begins to reappear 
in the form of young meduse. 
The parasitic larve of the Actinian Halcampa are plentiful on 
Campanularian meduse. 
The Polychete larve and Nauplit, so abundant in February and 
March, are now scarce. 
The Zoxx of Porcellana and of Portunide are particularly 
numerous. 
Every year at this time the harbour is invaded by shoals of 
young brill (Rhombus levis) in their pelagic stage. 
June.—This is the month, par excellence, for Aurelia aurita and 
Ctenophores. Leptomedusz also abound; large Obelix are now 
plentiful, and a new form, Laodice cruciata (Thaumantias pilosella of 
Forbes), makes its appearance. 
The first specimens of pelagic Terebellid larvee in gelatinous tubes 
may perhaps be taken. 
NEW SERIES.—VOL. III, NO. ILI. 18 
