A Pteropod Alias. {Read Sth December, li)05.) — In a recent memoir 

 on "The Thecosomata and Gymnosomata of the Siboga Expedition," 

 Mr. J. J. Tesch touches on the nomenchiture of the genus usually known 

 as Cavolinia. In a footnote (p. 34) he states that a name '■'■ Gioenia,'^ 

 which he is unable to verity, probably has priority over Cavolinia, and 

 in Appendix I he adds that he afterwards consulted the book, and finds 

 that "the author (Gioeni) proposes, on p. xxiv and p. xxv, that the animal, 

 which without any doubt must be Cavolinia tridentata, shall be called 

 after him." This ambiguous remark suggests that "■ Gioenia" was here 

 legitimately proposed for a Pteropod. But in the " Index Animalium " 

 (vol. i, pp. xxvi, 421) Slierborn definitely states that here " Gioenia does 

 not occur." The same useful guide assists us to the discovery that 

 Bruguifere defined and figured (Encycl. Meth., Vers i, p. xii, pi. clxx) as 

 Oioenia, the gizzard oi Scaphawier. If revived, Gioenia apparently should 

 oust Scaphander. Tesch's citation and Sherborn's omission of Cavolinia 

 or Cavolina of Abildgaard suggest that the Swedish author did not use 

 binomials, and that his name cannot be maintained. But Cavolina of 

 Bruguifere (op. cit., pi. Ixxxv) is a Nudibranch. What name, then, 

 Humphrey's, Lamarck's, or another's, shall be given to Anomia tridentata, 

 Forskal ? O. Hedley. 



The above note rendered it desirable that some person who had access 

 to the literature should consider the question. Gioeni's work, which 

 appeared in 1783, does not contain any Latin names, and is of no authority 

 in nomenclature. He dealt with three forms : (a) the gizzard of 

 Scaphander, afterwards called Gioenia by Bruguifere ; (b) what I take to 

 be the Anomia tridentata of Forskal ; (c) a true Aiwrnia. In 1791 

 Abildgaard (Skr. Nat. Selsk., vol. i, pt. 2, p. 175) proposed the name 

 Cavolina for a form which he figured and called G. natans, and which 

 I consider to be the Anomia tridentata of Forskal. The same year 

 Brugui5re proposed the same name (Eucy. Meth., Tabl. Vers, pi. Ixxxv) 

 for two forms which are, according to p. 138 of the same work (published 

 in 1824), Eolis peregrina, Lam., and E. ajinis. Lam. The name was 

 therefore used in one year both for a Pteropod and a Nudibranch. 

 Bearing in mind the impossibility of deciding at the present day as to 

 their relative priority, and also that Bruguifere's name only appeared on 

 the plate, I consider that Abildgaard's name should be adopted, as has 

 generally been done. Gioenia of Brugui^re appeared in 1789 (Ency. Meth., 

 Vers, vol. i, p. xii), and related to the gizzard of Scaphander lignaria (see 

 Deshayes, Ency. Meth., Vers, vol. ii. p. 167)- The conclusion, therefore, 

 at which I arrive is that Cavolina, Abildgaard, is the correct generic term 

 for the Anomia tridentata of Forskal. E. R. Sykes. 



On the Locality of the Melanotic Helicigona aubustorum 

 EXHIBITED November 10th. {Read 8th December, 1905.) — It occurs in 

 a hedge-bank on the Corallian between Todber and Marnhull in North 

 Dorset. A ditch always containing water adjoins the hedge-bank, but the 

 latter is not particularly damp. The species is chiefly confined to that 

 part of the hedge which has an undergrowth of ivy. All the specimens 

 are somewhat darker than usual, but absolutely melanotic forms are very 

 rare there. I believe only two or three have been as yet found. 



G. W. Swanton. 



On Cunvs Wateshouse.^, Brazier,' var. {Read I2th January/, 

 1906.)--This variety from the Maurituis differs somewhat in colour from 



^ It was pointed out by Mr. G. B. Sowerby, and the meeting generally concun-ed, 

 that this so-called species was merely the young state of C. distans, Hwass. — Ea. 



