STYELA OPALIXA. 109 



Hal. From ten to fifteen fathoms depth. 



EXULAXD. - - Diamond trawling ground, Hastings, 

 Sussex (Bowerbanfc). 



First record. Alder [1863] ; coll. Bowerbank. 



Of this pretty little species a single specimen only 

 was obtained, and, as the internal parts were partially 

 decomposed, their character could not be very satis- 

 factorily made out. We know of no other Sti/ela, how- 

 ever, with which it can be confounded. In its opaline 

 and mamillated test it somewhat resembles a miniature 

 ta, but besides its generic difference, it 



br. 



FIG. 63. Test of Styela opalina. Two and a half times natural size. 



be. Branchial aperture. 



likewise differs in form, and in the more numerous and 

 smaller mamillse. 



6. Styela coriacea Alder & Hancock. 



(PI. XXXVII, fio-s. 1-4 ; PL XXXIX, figs. 2 and 3 ; 

 PL XLI, figs. 4 and 5.) 



Cy nt.lt ia coriacea ALDER & HANCOCK in Trans. Tyneside Nat. 

 Field Club, I [1848], p. 196; FORBES & HANLEY Brit. 

 Moll. II [1849], p. 375 ; [COCKS in Rep. R. Cornw. Polyt, 

 Soc. 1849 (1850), p. 72; ALDER in Nat, Hist. Trans. 

 Xortlmmb. Durham, I (1865), p. 11; NORMAN in Rep. 

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



Body conical or cylindrical when extended, nearly 

 hemispherical when contracted, adhering by a broad 

 base. Apertures terminal, approximated, slightly tubu- 

 lar, each edged with a line of red. Test (PL XXXVII, 

 figs. 1-4) yellowish-brown, minutely granular, rough, 

 much wrinkled, and often covered with zoophytes 



