MARINE MOLLUSCA OF MADETRA. 239 



on the foot, with a very few and extremely minute specks of 

 crimson, and each of the two tail-tips has a bright but minute 

 crimson fleck. Preserved in spirit, the animal's colour changed 

 to a uniform brownish-black. 



Shell: in shape like one outspread wing and tail of a bird 

 which has been cut longitudinally through the middle ; in the 

 centre there is a small thickened nucleus, with a short pillar 

 and an open coil of one and a half whorls. In substance, colour, 

 and ornamentation it is much like the shell of Philine scabra. 

 Mull., or P. punctata, Clerk. A fine but distinct marginal bar 

 of somewhat varying strength, beaded on the outer face and pro- 

 jecting sharply on the inner face of the shell, runs round nearly 

 the whole edge, and three or four others occur at somewhat 

 irregular intervals between the upper and lower edges of the 

 shell. Besides these there are many spiral and longitudinal 

 undulations with much finer rounded spirals. — L. (body) half an 

 inch, B. 0-3. Shell, L. 009, B. 0-065. 



Funchal, Punta de Sao Lourenco, Cani§al. From shallow 

 water to 50 fms. 



The shells of this species I found not unfrequently, but only 

 one living animal presented itself. It lived with me for some 

 days. I never saw it swim — it always crawled, and then never 

 on the surface of the sand of the bottom ; as soon as it could it 

 passed in just below the surface, burrowing not deeply, but 

 forcing the sand to rise and pass over its back in a way very 

 curious. 



Cf. Acera marmorata, Cantraine, Malac. Medit. p. 73, ii. 2. 

 Doridium carnosum, Cuvier, and D. membranaceum, Meckel, 

 Yeyssiere, Moll. Opisthobranches, pp. 44-49, pi. ii. 42-47. 



Fam. Pleurobbanchid^:. 



Gen. PliEUROBBANCHTJS, Cuv. 



8. Pletjbobbanchtts Dautzenbergi, n. sp. 



Shell oval, flattened, fairly strong, white, dull outside but 

 glossy within. Sculpture: strongish, irregular and unequal lines 

 of growth, with longitudinal striae, similar to but keener than 

 those of P. plumula; the oblique furrow of that species is 

 entirely absent. Colour semitransparent to opaque yellowish 

 white. Spire : a small rounded knob lying well over to the 

 right and bent down on the back of the shell so as to be quite 



