Cavolina.] PTEROPODA. 55 



3. Cavolina telemus, Linne, 1758. Plate 6, fig. 3. 



Monoculus (?) telemus, L., Syst. Nat., ed. x, 1758, 635. Anomia tridentota, 

 Forskal. Desoript. anim., &c., 1773, 124. Cavolina natans, Abildgard,. 

 Skriv. Naturhist. Selsk., i, 1791, Heft 2, pi. 10. Hyalcea cornea, Lamarck, 

 Syst. A.s.V., 1801, 140. H. papilionacea, Bory de St. Vincent, Voy. 

 quatre prinoip. iles mers d'Afrique. i. 1804, 137, pi. 5, f. 1. Hyale 

 tenuibranche, Peron and Lesuexir, Ann. Mus. Hist. Nat. Paris, xv, 1810, 

 pi. 2, f. 13. Hyalcea Peroni, Lesueur, Nouv. Bull. Soc. Philom., iii, 1813, 

 284. H. Chemnitziana, Lesueur, ibid., 284. H. australis, Peron, Voy. 

 terres australes, i, 1816, pi. 31, f. 5. H. Forskalii, Lesueur, MS., in. 

 Blainville. Diet. Sci. Nat., xxii, 1821, 79. H. a/finis, d'Orbigny, Voy. 

 Amer. merid., v, 1836, 91, pi. 5, f. 6-10. H. truncata, Krauss, Siid- 

 afric. Moll., 1848, 34, pi. 2, f. 12, not of Lesueur. Diacria tridentata, 

 Forsk. : Gray, Gat. Moll. Brit. Mus., pt. ii, Pteropoda. 8. Hyalcea 

 Cumingii. Sower by. Conch. Icon., xx, Pteropoda, f. 5. Cavolinia tri- 

 dentata. Forsk. : Pelseneer, Chall. Rep., xxiii, 1888, 83 ; Hedley. T.N.Z.I., 

 xxxviii, 1905 (1906). 75. C. telemus, A. Adams, A.M.N.H. (3), iii, 

 1859, 44. 



Shell globular, yellowish, pellucid, thin, very finely striated trans- 

 versely ; hinder central process short, terminal tooth longer than the 

 lateral ones. (Gray.) 



Hah. Chatham Islands ; Whangarei Heads (C. Cooper) ; off Great 

 Barrier Island, in 110 fathoms. 



4. Cavolina trispinosa, Lesueur, 1821. Plate 6, fig. 4. 



Hyalcea trispinosa, Les., in Blainv., Diet. Sci. Nat., xxii, 1821, 82; Forbes 

 and Hanley, Hist. Brit. Moll., ii, 380. pi. U, f. 3. Diacria trispinosa, 

 Les. : Gray, Cat. Moll. Brit. Mus., pt. ii, Pteropoda, 10. Pleuropus tri- 

 spinosus, Les. : Ad., G.B.M., ii, 611. Hyalcea trispinosa, Les. : Boas, 

 " Spolia atlantica," 94, pi. 1, f. 3 ; pi. 2, f. 14. Cavolinia trispinosa, Les. : 

 Pelseneer, Chall. Rep., xxiii, 76 ; Hedley, T.N.Z.I., xxxviii, 76. HyaJcea 

 mucronata, Quoy and Gaimard, Ann. de Sci. Nat. (1), x, 231, pi. 86, 

 f. 1, 2. Diacria mucronata. Q. & G. : Gray, i.e., 11. HyaJcea depressa 

 Bivona, Efem. sci. Sicilia, 1832, 57, pi. 1, f. 4, 5. H. cuspidata, Delle 

 Cliiaje, Descr. anim. senza vert. Napoli, 1841, pi. 180. f. 1, 2, not of 

 d'Orbigny. H. Eeeviana, Dunker, Index Moll., 1853, 2, pi. i, f. 17-20. 



Shell depressed, straight, and kite-shaped ; anterior extremity, or 

 the portion above the short but very acute lateral spines, is much 

 shorter than the posterior end ; the latter produced into a very long 

 and slender straight caudal spine, mostly broken off. Mouth short, 

 narrow, semielliptic ; the marginal fissure extending to the lateral 

 spines is linear ; both lips briefly and abruptly reflected. Colour 

 transparent white, brownish near the lips and at the commencement 

 of the tail. Upper and lower surfaces of nearly equal convexity, 

 mostly devoid of marked concentric stria?. The former projects semi- 

 circularly beyond the straightish labial edge of the latter. Upper sur- 

 face with a broad rounded central longitudinal fold, generally divided 

 in front into three smaller ones, flanked on each side with a strong 

 narrower fold, leaving a flattish triangular space between it and the- 

 end of the lateral spine. Lower surface with a slight fold adjacent to> 

 each lateral spine. 



