OXYNOE. 163 



Shell external, thin, fragile, pellucid and shining, convolute, glo- 

 bose ; truncate and slightly contracted at summit, rounded and 

 dilated at base. Last whorl very large, completely detached from 

 the spire by the deeply incised sutural slit. Aperture very large, 

 angled above, rounded below ; lip arcuate, simple and acute ; col- 

 umellar margin with a very thin film of callus above, concave be- 

 low, acute, forming an open spiral through which the interior of the 

 whorls may be seen from the base. Color uniform glassy white, with 

 a thin transparent and shining, very light yellow cuticle. 



Alt. 12, diam. 9 mill. (B. D. & D.). 



Body elongated, swollen in front of the middle, with the tail long 

 and narrow, pleuropodial lobes partly covering the shell, the line of 

 their junction forming a crest or ridge the entire length of the tail. 

 Upper side of tentacles and outer surface of pleuropodia and tail 

 papillose. Color above clear green, the borders of the foot and 

 pleuropodial lobes, and ends of the tentacles margined with alter- 

 nating spots of pale red and blue-black. Sole yellowish (Krohri). 



Mediterranean Sea : Syra, Serpho, Grecian Archipelago (Forbes) ; 

 Sicily (Raf., Monts.) ; Malta (Soul.) ; southern France, at Canet (B. 

 D. & D.) ; Balearic Is. (Pagenstecher) in the laminarian zone. 



Oxynoe olivacea RAFINESQUE, Journ.de Physique Ixxxix, 1819, 

 p. 152 ; Binney & Tryon's reprint, p. 33. MORCH, Journ de Conch., 

 1863, p. 44. WEINKAUFF, Conch des Mittelmeeres, ii, p. 180. 

 JEFFREYS, Rep. Brit. Ass. Adv. Sci., 1873, p. 114. MONTEROSATO, 

 Journ. de Conchyl., 1878, p. 158. BUQUOY, DAUTZENB. & DOLL- 

 FUS, Moll. Mar. Rouss. i, p. 549, pi. 63, f. 16, 17 (shell). Bulla 

 gargottce CALCARA Monogr. dei gen. Claus. e Bui. ecc., p. 45 (1840). 

 Icarus gravesi FORBES, Rep. JEg. Invert., Rep. Brit. Ass. Adv. 

 Sci., 1844, pp. 134, lS7.Lophocercus sieboldi KROHN, Ann. Sc. 

 Nat. (3), vii, p. 55, pi. 2, f. 5-9, 11 (1847). SOULEYET, Journ. de 

 Conchyl., i, 1850, p. 235, pi. 10, f. 1-12. H. & A. AD., Gen. Rec. 

 Moll., ii, p. 30, pi. 59, f. 1, la. CHENU, Manuel de Couch./i, p. 394, 

 f. 2989, 2990. PAGENSTECHER, Verh. Naturhist.-Medicinischen 

 Vereins zu Heidelberg (n. F.), i, p. 58, 1874 (Anatomy and syste- 

 matic position). Bulla (Lophocercus) sieboldi A. ADAMS, in Sowb., 

 Thesaurus, pi. 119, f. 19 (copy from Krohn). Oxynoe sieboldi 

 WEINKAUFF, Conch, des Mittelm., ii, p. 181. FISCHER, Man. 

 Conch., p. 570, f. 333. Oxynoe brachycephalus MORCH, Journ. de 

 Conchyl., 1863, p. 45 (based on H. & A. Adams' figure). 



