TURBELLARIA OF PLYMOUTH SOUND. 45 
Sub-order 2.—TRICLADIDA. 
Family PLANARITDA. 
Genus 21.—Fovia. 
49, Fovia arrinis Stimpson. 
In a sandy creek, Wembury Bay. 
Sub-order 3.—POLYCLADIDA, 
A. ACOTYLEA. 
Family PLANOCERIDA. 
Genus 22,—LEPTOPLANA. 
50. Leprophana TREMELLARIS (O. F. Miiller). 
I have recently ascertained that many examples grouped under 
this species, on the ground of their general agreement with the type 
in form, colour, and the number and position of the eye-groups, in 
reality belong to the next species. The subject requires further 
investigation, which, owing to the pressure of other work, I am 
unable to undertake at present. The specific characters and syno- 
nymy of this form are given fully by Lang in his “ Polycladida,” and 
the previous records on our coast in my “ British Marine Turbellaria.”’ 
Adult examples occur generally at Plymouth, under stones and 
shells from the littoral zone down to 15 fathoms. They are plenti- 
ful during July and August, becoming scarcer in September. Mr. 
Garstang informs me that the species during February is difficult to 
discover even in its summer haunts. It is tolerably certain that, like 
the majority of littoral animals, the adults die in the autumn, and the 
young probably attain sexual maturity in the following summer. 
Copulation in this species has not hitherto been observed. The 
egos are laid in successive batches, surrounded by an albuminous 
substance. They adhere to stones, algw, &c., between tide-marks, 
and after a period varying from a fortnight (Keferstein) to two 
months (Hallez) the larvee hatch out. Specimens 1 to 3 mm, in length, 
and having the outline of a spherical triangle, were fairly abundant 
in the littoral zone in September. Thus at Wembury Bay and inside 
the Breakwater many specimens were obtained with the aid of the 
