CLAVELINA LEPADIFORMIS. 153 



Clavelina lepadiformis SAVIGNY [in Descr. Egypt., Hist. Nat. 

 I (1809), pt. 2, p. 46 ; and] Mem. Anim. sans Vert. pt. 2 

 [1816], pp. 110, 174, (?) 237 ; FLEMING [in Edinb. Encyd. 

 XIV, pt. 2 (1820), p. 631;] Brit. Anim. [1828], p. 468; 

 [and Moll. Anim. (1837), p. 202, pi. xvi, f. 57; THOMPSON 

 in Ann. Nat. Hist, (1) V (1840), p. 95 j] MILNE EDWARDS 

 Obs. Ascidies Comp. [in Mem. Acad. Sci. Inst. France, 

 XVIII (1842),] p. 266, pi. i, f. 1, pi. ii, f. 1; [DESHAYES 

 Moll, in Cnvier's Regne Anim. (1836-49), pi. cxxvii, 

 ff. 2, 2a;] Forbes & HANLEY Brit. Moll. I [1848], p. 26., 

 pi. E, if. la, Ib ; ALDER & HANCOCK in Trans. Tyneside Nat. 

 Field Club, I [1848], p. 202 ; [Cocxs in Rep. R, Cornw. 

 Polyt. Soc. 1849 (1850), p. 73; RUPERT JONES in Cycl. Anat. 

 IV, pt. 40 (1850), p. 1 196 ; CARUS in Proc. Ashmol. Soc. II 

 (1851), p. 267 ;] GOSSE [Man. Marine Zool. II (1856), p. 34, 

 f. 52, and] Tenby [1856], pp. 63, 162, pis. v, vi ; [HOEVEN 

 Handb. Zool. II (1856), p. 706;] THOMPSON Nat. Hist. 

 Ireland, IV [1856], p. 361; [WOODWARD Man. Moll. 

 (1856), p. 339, pi. xxix, f. 6; HUXLEY in Carus' Icon. 

 Zootom. I (1857), pi. xviii, ff. 17, 18; NORMAN in Zoolo- 

 gist, XV (1857), p. 5707 ; H. & A. ADAMS Gen. Recent 

 Moll. II (1858), pi. cxxxiii, f. 7 ; CHENU Encycl. Hist. 

 Nat., Moll., etc. (1858), p. 246; DICKIE in Rep. Brit. 

 Assoc. -for 1857 (1858), pp. 105, 111 ; BRONN Thier-Reichs, 

 III, 1 (1861), p. 128, etc., pi. xii, ff. 11, 21; pi. xv, 

 if. 22-29; ANSTED & LATHAM Channel Isl. (1862), p. 219; 

 ALDER in Nat. Hist. Trans. Northumb. Durli. I (1865), 

 p. 11, and in Rep. Brit. Assoc. for 1866 (1867), p. 208; 

 NORMAN in Rep. Brit. Assoc, for 1868 (1869), p. 303]. 



Body elongate, hyaline, the thoracic portion enlarged 

 and forming about a third (or sometimes nearly one 

 half) of the whole animal ; marked with yellow or 



v 



opaque white lines ; two longitudinal, and two less 

 conspicuous circular ones, circumscribing the branchial 

 sac. Apertures not far apart, the branchial terminal 

 and largest, the atrial slightly to one side, both with 

 even rims, and occasionally margined with an opaque 

 line. Test and mantle perfectly transparent and colour- 

 less, showing the viscera through ; the stomach appear- 

 ing as a bilobed orange mass with white lines, half way 

 down the peduncle. Branchial sac with twelve or 

 fourteen rows of elliptic oblong meshes. 



