298 SUMMARY OF CURRENT RESEARCHES RELATING TO 



one occasion) a gliding on the surface with the foot upwards, after the 

 fashion of Aplysia and Lymnteus. He has studied -the copulation, and 

 finds that the same individual may copulate several times in succession, 

 that the animal serving as a male in one copulation may function as a 

 female next time, and that to the same animal which functioned pre- 

 viously as the female. The oviposition occurs about eleven days after 

 fertilisation, and the long, whitish strings are described. 



Structure of Oliva peruviana.* — B. Haller gives an account of the 

 coloration of the shell (primarily a uniform yellow-brown, with a thin 

 violet layer underneath this), and describes the nervous, alimentary, 

 excretory, and reproductive systems. In its entire organisation, Oliva 

 is not far from Muricidaa and Buccinidse ; it is peculiar in its shell 

 (which has not even a rudiment of an operculum), in its foot, and in 

 other features which mark the genus as near the terminus of a divergent 

 twig. It seems probable that OlivanciUaria (with an operculum) is one 

 of the oldest forms of Olividae, and that Harpa is older than Oliva. 



New Genus of Caecidae.t — A. Distaso gives an account of a speci- 

 men belonging to the family Caacidas found at Naples in sand along with 

 Amphioxus. It is 2 mm. long, and remained the same size and form for 

 five months, so that it is, very probably, adult. It is made the type of 

 a new genus — Pseudoparastrophia levigata g. et sp. n. It has a small 

 shell, which is scarcely recurved, a thin mantle, an almost concave, 

 horny operculum, with spire, two cylindrical tentacles, club-shaped at 

 tip, and bearing long and sensitive cilia. 



South Australian Nudibranchs. % — H. Basedow and C. Hedley 

 report on a number of new Nudibranchs from South Australia, and give 

 a census of the known species, illustrated by 12 plates, mostly coloured. 



Antarctic Nudibranchs.§ — A. Yayssiere reports four Nudibranchs 

 and two Marseniadas collected by Charcot on the French Antarctic 

 Expedition. There is a variety of Archidoris tubercidata Cuv. ; a 

 new genus, Guy-Valvoria, related to Facelinidas, Tergipedinaa, and 

 iEolidiadae ; Notceolidia gigas, reported by Sir Charles Eliot from the 

 ' Scotia ' collection ; a new genus, Charcotia, related to iEolidiadae and 

 Tritoniadae. A new species of 3Iarseniopsis, and a new genus Lamel- 

 lariopsis (in the vicinity of Marseniopsis and JIarsenina), represent the 

 Marseniadae. Thus the small collection is very distinctive. 



New Phyllirhoid.jl — Emile Andre describes Ctilopsis pictetig. etsy. n., 

 a new Phyllirhoid from Amboina, which necessitates a slight modifica- 

 tion in the diagnosis of the family. The rhinophores are short and 

 large, subcorneal, united by their bases ; the eyes are distinct ; the 

 posterior end of the body is truncated ; there are three hepatic caeca, 

 two posterior and one anterior ; the anus is on the dorsal margin ; there 



* Jena Zeitschr., xl. (1905) pp. 647-65 (1 pi. and 3 figs.). 



t Zool. Jahrb., xxii. (1905) pp. 433-50 (1 pi.). 



X Trans. Roy. Soc. S. Australia, xxix. (1905) pp. 134-60 (12 pis.). 



§ Comptes Rendus, cxlii. (1906) pp. 718-19. 



|| Revue Suisse Zool., xiv. (1906) pp. 71-80 (1 pi.). 



