556 SIR CHARLES ELIOT. 



is a row of piirjilish spots and the sole and sides of the foot are streaked with the same 

 colour. The margin of the mantle is undulated. The rhinophore sheaths not much raised 

 and with smooth margins. The branchial opening roundish with indistinct lobes and con- 

 taining five small tripinnate branchiae. No labial armature. The radula consists of simply 

 hamate teeth, smaller towards the outside but not denticulate. The verge is armed with 

 hamiferous discs. 



Not having access to the descriptions of some recorded species of Platydoris, I cannot 

 give an opinion as to whether this form is new or not. I lay no stress on the branchial 

 opening being roundish. This is not unfrequently the case in alcoholic specimens, although 

 the opening may be typically stellate. 



Gen. Dictyodoris Bergh'. 



The texture of the body is leathery, the dorsal skin smooth. Foot not grooved in front 

 or only slightly. Branchial aperture round : branchiae few, bipinnate. Tentacles digitiform. 

 No labial armature. Radula of simply hamate teeth with naked rhachis. Reproductive 

 system unarmed. The two known species have reticulate figures on the back and only four 

 branchiae. In D. tesselata the outermost teeth are pectinate, in D. macidata not. 



19. D. macidata n. sp. 



One specimen from the Fainu-Inguradu Channel, N. Mahlos, Maldive Islands, 26 f. 

 Nearly round in form: length 8 mm., breadth 6 mm. Colour bluish-white, with blackish spots 

 which seem to be under the skin. There are several black spots of a more ordinary ap- 

 pearance on the under edge of the mantle and a black rim running round at the junction 

 of the foot and body. On the dorsal surface is a reticulate pattern formed by ridges, 

 but their conspicuousness is due rather to a difference of colour than to their real 

 prominence, which is small. I could not distinguish any gi-oove in the anterior part of the 

 foot. Branchial aperture small and round: 4 bipinnate whitish gills, the posterior pair being 

 smaller than the others: the main and secondary axes are marked by a broad black line. 

 Tentacles digitate : no labial armature : radula fairly broad : no central tooth : laterals simply 

 hamate, the innermost small, the outermost irregular, sometimes bifid or trifid but not 

 consistently pectinate. Central nervous system somewhat concentrated, though not as in 

 Asteronotns, two pairs of ganglia being distinguishable. 



This specimen bears a striking resemblance to Alder's drawing of Doris Incii (reproduced 

 in Gray's Figures of Molluscous Animals, 18.50, Tab. 226, figs. 1 a, b, c), which, as Bergh 

 points out, may represent either a JJicti/odoris or Spluierodoris. As however we have no 

 account of the anatomy of this animal, it can never be possible to certainly attribute it 

 to either genus. In spite of the strong external similarity of the present Dorid to Alder's 

 drawing I do not propose to call it D. Incii because the figure has (1) indistinct but 

 apparently simply pinnate branchiae, (2) no tentacles, (3) starlike apertures for the rhino- 

 phores, (4) no spots or dark rim on the under surface. The genus Dictyodoris appears to 

 be closely related to Halgerda, Bergh. 



' Bergh, ,S'. R. Sup. Heft i. 1880. 



