70 BEITJSH TUNTCATA. 



1. Eugyra arenosa Alder & Hancock. 



(El. XXVI, figs. 10-12; PL XXIX, figs. 1-4; PL XL, 

 fig. 5 ; and figs. 48 and 49 in text.) 



Itlolgnla tululosa FORBES in Brit. Moll. I [1848], p. 36 

 (pars, excl. fig.) ; [Cocxs in Rep. E. Cornw. Polyt. Soc. 

 1849 (1850), p. 73; THOMPSON Nat. Hist, Ireland, IV 

 (1856), p. 360; HUXLEY in Cams Icon. Zootom. I (1857), 

 pi. xviii, ff. 1-9 ; DICKIE in Eep. Brit. Assoc. for 1857 

 (1858), pp. 105, 111 ; MclNTOSH in Proc. E. Soc. Edinb. 

 V (1866), p. 605; LECAZE-DUTHIERS in Conrpt. Eend. 

 LXX (1870), p. 1154, and in Ann. Nat. Hist. (4) VI 

 (1870), p. 109]. 



\_Molyula tnbnlaris THOMPSON in Ann. Nat. Hist. (2) I 

 (1848), p. 63; FORBES in Eep. Brit, Assoc. for 1850 

 (1851), p. 242.] Non Ascidia tubuhtrls EATHKE in 

 Miiller's Zool. Danica, IV [1806]. 



Molgula arenosa, ALDER & HANCOCK in Trans. Tyneside Nat. 

 Field Club, I (1848), p. 197; FORBES & HANLEY Brit. 

 Moll. II [1849], p. 374; [HANCOCK in Ann. Nat. Hist. 

 (2) V (1850), p. 196; WOODWARD Man. Moll. [(1856), p. 

 357,] (excl. fig.) ; [LEWES Sea-side Stud. Ilfracombe 

 (1858), p. 91 ;] ALDER in Ann. Nat, Hist, (3) XI [1863], 

 p. 160, pi. vii, ff. 3, 4; [in Nat, Hist, Trans. Northumb. 

 Durli. I (1865), p. 11 ; and in Eep. Brit .Assoc. for 

 1866 (1867), p. 208; MCINTOSH in Eep. Brit. Assoc. 

 for 1867 (1868), Sect. p. 92; NORMAN in Eep. Brit. Assoc. 

 for 1868 (1869), p. 302]. 



Body globular, hyaline, unattached, closely covered 

 with sand, excepting generally a bright smooth area 

 on one side. Apertures nearly terminal, approximated, 

 not much produced, conical or slightly tubular, retrac- 

 tile ; set in a small circumscribed area with a raised 

 rim, appearing like a slit when contracted. Test soft, 

 glossy, transparent and colourless, with delicate slender 

 fibrils sometimes a little branched. Mantle free, except 

 at the tubes, very thin, soft, transparent, showing the 

 viscera very distinctly through it. Tentacular fila- 

 ments bipinnate, beautifully spotted with bright opaque 

 yellow. Brain-Hal sac with seven longitudinal bands 

 on each side, between which are seven rows of conical 



