28 
plumes small, erect, ten, rudely pinnate, surrounding the vent, and 
retractile into a common ciliated cavity. Dorsal tentacles rather 
large, ovate, obtusely mucronated, rudely and coarsely laminated 
obliquely, and retractile into ciliated cavities. Labial appendages 
slender and tapering cylindrically. Foot oblong and rounded at 
both ends. Colour ashy-grey, dotted with dusky. Tips of the 
branchize brown, and also the lamellze of dorsal tentacles. 
28. Doris VIBRATA. 
The general outline of this species is oblong; when at rest it 
assumes an oval form. Mantle smooth, convexly rounded above, 
rounded and somewhat dilated in front, acutely rounded behind, 
margins thin, not concealing the foot behind. Branchial plumes 
small,"suberect, seven in number, linear, quadrangular, and ciliated 
on the angles their whole length, retractile into a common simple 
cavity. They decrease in size posteriorly. Anal tube prominent. 
Dorsal tentacles short, ovate, obliquely lamellated, and retractile 
into simple cavities. Labial tentacles small and cylindrically taper- 
ing. Foot elongate, nearly as wide as the mantle, obtusely rounded 
in front and tapering to an acutely round point behind, which pro- 
jects beyond the posterior end of the mantle. Colour above yellow, 
regularly spotted with white, pale towards the margins, which are 
dotted and edged with purple. Branchial plumes edged with violet. 
Dorsal tentacles violet, with uncoloured peduncles. Foot white. 
When in confinement very active, and, whether creeping or at rest, 
continually vibrating its branchiz. 
The above and two following species form a group, similar in ge- 
neral form, with simple, linear, quadrangular-shaped branchie. 
29. Doris PROPINQUATA. 
Form, when at rest, oblong, substance very soft. Mantle convex 
above and covered with rather distant, depressed, irregular-sized 
white papillee, which do not extend to the margins. Extremities 
rounded, rather wider posteriorly, not concealing the foot behind ; 
margins thin, and much undulated. Branchial plumes large, sub- 
erect, twelve in number, linear, nearly quadrangular in their trans- 
verse section, ciliated, decreasing in height posteriorly, surround- 
ing the vent, and retractile into a common simple cavity. Anal 
tube erect and very prominent. Dorsal tentacles rather large, nearly 
erect, elongately ovate, obliquely finely lamellate and retractile into 
simple cavities. Head prominent and furnished with elongate, cy- 
lindrically tapering tentacular appendages. Foot elongate, tapering 
posteriorly to a point far behind the mantle. Colour above bright 
yellow, becoming white at the margins, which are bordered irregu- 
larly with purple; four oblong dots of the same colour in front of 
the dorsal tentacles. Dorsal tentacles purple on the outer portion. 
Branchial plumes edged with the same colour. 
Length 1 inch 3 lines. 
This Doris possesses the same habit of vibrating its branchial 
plumes as the preceding. 
a. 
