352 PKOCp;EDrNGS of THK MALACOLOGICAL SOCIETr. 



largest 38-40. There is no trace of bilobation, except that the middle 

 of the tooth is generally marked by two denticles set in a V shape. 

 The denticles are often broken or blunted, and it would appear that 

 even when perfect they do not slope symmetrically to a point. The 

 teeth are much like those of the jEolidia scrotina found by Plate in 

 Chile, and figured by Bergh (Opisth. Plate, Taf. xxxi, 26-31). 



With that animal the present specimens seem to be identical. The 

 large bare space on the back, the absence of projecting corners to the 

 foot, and the shape of the teeth are points of resemblance. The radula 

 was much longer m Plate's specimen, but about the same (22) in the 

 one from Valparaiso described by Bergh in 1874. 



Is this species identical with JEoVulia papillosa'i Bergh (see the 

 references above) seems to have held different opinions on this point, 

 but in his latest notice of the form (1898) he registers it as a distinct 

 species. In this, as in other cases, it is perhaps safest to separate 

 specimens coming from such widely different localities and known 

 only in their preserved condition. 



On the other hand, the three known species of JEolidia {^. papillosa, 

 ^. scrotina, Chile and Falkland Islands, yl^. hercidca, California) show 

 few decided differences, and Bergh considers that the true JEoliclla 

 papulosa is found on the west coast of North America. yE. scrotina is 

 said to be reddish when alive, but this need not be a specific difference, 

 for I have seen large specimens of JE. papillosa at Plymouth of a fine 

 rosy-gray with greenish cerata. 



Ckatena Valentini, n.sp. PI. XXVIII, Figs. 4, 5. 



Several specimens. As preserved they are white or brownish. 

 A coloured figure (Fig. 5) by Mr. Valentine represents a mottled 

 ^olid of stiff and irregular appearance, characters also found in the 

 preserved specimens. 



The larger specimens are about 10 mm. long, 3 broad, including the 

 cerata, and 2-5 high to the top of the pericardium. The body looks 

 tuberculate, especially at the sides, but this is due merclj' to the 

 hermaphrodite gland showing through. There is no tail to speak of 

 distinct from the body. The foot is apparently without natural 

 projections at the anterior corners, but as preserved it varies greatly. 

 The rhinophores and tentacles are of moderate size, wrinkled, but not 

 really perfoliate. The cerata are not set opposite one another, which 

 gives the whole animal an irregular appearance. There are 5-6 large 

 ovate cerata, and at the base of each, generally a little behind it, 

 a very small one. The hepatic diverticula are yellowish, not much 

 branched, but bearing knobs. The anus lies on the right side, just 

 below the dorsal margin ; a little in front of it is the renal pore. 



Three radulse examined consisted of a single row of 22, 24, and 

 25 colourless transparent teeth respectively (Fig. 4). They have 

 a moderately large central cusp bearing 7-8 denticles in the front 

 teeth and 9 in those behind. The edge bearing these denticles forms 

 a shelf distinctly on a lower level than the median and hinder part of 

 the teeth, and onl}- the first denticles are set on the same level as the 

 central cusp. 



