PELONAIA. 145 



These compound generative organs have a very 

 peculiar appearance, 011 account of their remarkable 

 form and the symmetrical arrangement of their 



v O 



parts, enhanced by their colour; the tubular ovaries 

 being of a bright yellow-ochre colour, and the fringing, 

 male vesicles, almost white. 



1. Pelonaia corrugata Forbes & Goodsir. 



(PI. XLVI, figs. 15 and 1(3 ; PI. XL VII ; PI. XLVIII, 



fig. 18; and figs. 81 and. 82 in text.) 



Pelonaia comi.yata FOEBES & GOODSIR [in Rep. Brit. Assoc. 

 for 1840 (1841), Sect. p. 138, and] in Edinb. new Philos. 

 Journ. XXXI [(1841), p. 30, pi. i, f. 1] ; FORBES & 

 HANLEY Brit. Moll. I [1848], p. 43, pi. E, f. 4; ALDER & 

 HANCOCK in Trans. Tyneside Nat. Field Club, I [1848], 

 p. 195; [ALDER in Trans. Tyneside Nat. Field Club, I 

 (1850), p. 365 ; COCKS in Rep' E. Cornw. Polyt. Soc. 1849 

 (1850), p. 72; NORMAN in Zoologist, XV (1857), p. 5708; 

 H. & A. ADAMS Gen. Recent. Moll. II (1858), pi. cxxxiii, 

 f. 4; BRONN Thier-Reichs, III, 1 (1861), p. 121 ; ALDER 

 in Nat. Hist, Trans. Northumb. Durh. I (1865), p. 11; 

 MclNTOSH in Ann. Nat, Hist. (3) XIX (1867), p. 414 ; in 

 Rep. Brit, Assoc, for 1866 (1867), Sect. p. 76 ; and op. cit. 

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

 1868 (1869), p. 302; M. & G. 0. SARS Christianiafjord. 

 Fauna, pt. 2 (1870), p. 102]. 



Ascidia rillosa DALYELL Rare Anim. Scotl. II [1848] , p. 141 . 



? Pelonaia arenifera STIMPSON [in Proc. Boston Soc, Nat. 

 Hist. IV (1851), p. 49]. 



? Pelonaia rillosa SARS in Forli. Vid.-Selsk. Christ. 1858 

 [(1859), p. 66]. 



[Pelonaia rugosa BEONN Thier-Reichs, III, 1 (1861), pi. xiii, 

 f. 19.] 



Body much elongated, vermiform or flask-shaped, 

 tapering upwards, broader and more rounded below, 

 and terminating posteriorly in an obtuse point. 

 Apertures closely approximated at the upper end, on 

 small conical papillose tubes, with a red margin. Test 

 (PI. XLVI, fig. 15) deep brown, opaque, strongly cor- 

 rugated transversely, hispid and smoother at the lower 

 end; usually covered with grains of sand. Mantle 



ii 10 



