STYELA MAMILLARIS. 107 



34;] FORBES & HANLEY Brit. Moll. [1848], p. 40; ALDER 

 in Ann. Nat, Hist. (3) XI [1863], p. 162. 

 [Phallusia mamillaris LCEWIG and KOLLIKER in Neue Not. 

 Geb. der Naturk. XL (1846), cols. 81, 98; RUPERT JONES 

 in Cyclop. Anat, IV, pt. 40 (1850), p. 1194, etc. ; SCHACHT 

 in Arch. f. Anat. 1851, p. 178, pi. iv^pl. v, ff. 1-6, and 

 (transl.) in Q. J. Micr. Sci. I (1853), pp. 35, 107; KROHN 

 in Arch. f. Anat. 1852, p. 312; BRONN Thier-Reichs, III, 

 1 (1861) p. 115, etc., pi. xii, ff. 1, 2 ; SCHULTZE in Arch. 

 f. mikr. Anat. XII, 2 (1862), pp. 179, 183, pi. xvii, f. 3.] 



Body irregular, depressed, transversely ovate, at- 

 tached throughout for nearly its whole length, deeply 

 wrinkled and strongly lobed or mamillated. Apertures 

 not far apart, the branchial a little distant from the 

 anterior end, the atrial about the middle of the upper 

 surface ; sessile, slightly tubular when expanded but 

 scarcely visible when contracted ; their inner margins 

 rayed with crimson. Test (PI. XXXIV, fig. 7) very 

 tough and thick, of a dirty yellowish colour, inside 

 silvery and marked with red near the apertures, closely 

 adherent to the mantle. Mantle (PI. XXXIV, fig. 8 

 and PI. XXXV, fig. 2) opaque, yellowish white or flesh- 

 coloured, blotched with crimson towards the apertures. 

 Tentacular filaments linear, long, and stout. Branchial 

 sac (PI. XLI, figs. 1 and 2) with four folds on each 

 side ; oral lamina smooth. Ovaries (PL XLI, figs. 2 

 and 3) scattered. 



Length an inch and a half to two inches. 



Hal. On submarine rocks (Gaertner). [Attached 

 to Laminaria digitata, (Thompson}.'] 



ENGLAND. Hastings, Sussex (BowerbanJc). Lulworth 

 Cove, Dorset (Jeffreys]. Cornish coast (Gaertner}. 

 Plymouth, Cornwall (Bate}. 



IRELAND. [Strangford Lough, Down, and Belfast 

 Lough, Antrim (Thompson, 1840)]. 



CHANNEL ISLANDS. Guernsey (Norman}. 



First record. Gaertner, in Pallas [1774] . 



Of this curious species, which had not hitherto been 

 recognized since the time of Gaertner and Pallas, I had 



