OCR Text |
Show 1 9 0 6 .] OF SOUTHERN INDIA AND CEYLON. 6 4 5 H algerda Bergh. (See Eliot on Dictyodoris tessellata, in Proc. Malac. Soc. vol. vi. pt. 4, 1905, p. 229.) The Doris apiculata of Alder <fc Hancock probably belongs to this genus, which in my opinion is not separable from Dictyodoris. Several new species have been described lately, of which Hcdgerda graphica Basedow & Hedley is closely allied to H. willeyi Eliot if not a synonym. The genus may be tabulated as follows :- 1. H. formosa Bergh. 2. H. ? apicidcitci (A. & H.). 3. //. (Dictyodoris) tesselcita (Bergh). f 4. H. wasinensis Eliot. [ 5. H. (Dictyodoris) maculcita Eliot; probably the young of H. wasinensis. 6. H. punctata Farran. j 7. H. willeyi Eliot. | 8. H. graphica Basedow & Hedley. 9. H. elegans Bergh. 10. H. rubra Bergh. 11. H. inornata Bergh. H algerda apiculata (A. & H .). (A. & H. 1. c. p. 122.) The type specimen is preserved at Newcastle, but the buccal parts have been extracted and the remains are so dry and hardened that nothing can be added to Alder and Hancock's description. That description, however, which includes the radula, makes it eminently probable that the animal is referable to Halgerda, and the filaments which surmount the tubercles should render it easy of recognition. P latydoris. To the list of 27 species belonging to this genus given by me in the ‘ Journal of Conchology,' vol. ii. Oct. 1905, pp. 252-3, may be added two more from the ‘ Siboga' Collection :- 28. PI. flammulata Bergh. 29. PI. sanguinea Bergh. Several of the species described are probably colour varieties. It is remarkable that the ‘ Siboga' obtained a form undistinguishable from the Mediterranean PI. argo in the Malay Archipelago. The chief characters of the genus are the hard and leathery consistency, the flat shape, and the armature of the reproductive organs. The efferent ducts are very thick and strong. The lining is raised into lumps and folds, generally yellow in colour, and in the male branch these lumps are in most species further developed into hard scales bearing hooks. These hooks, however, have not been found in PI. striata and PI. flammulata. Through the kindness of Prof. Herdman I have been allowed |