92 



MONODONTA. 



Var. PORCATA A. Adams. PI. 20, figs. 10, 11. 



More elongated than the type, aperture less dilated, columellar 

 tubercle obsolete. Alt. 15 mill. 



Labio porcatus A. AD. P. Z. S. 1851, p. 179 (not TrocJms porcatus- 

 Phil.). T. extenuatus FISCHER, Coq. Viv., p. 330, t. 103, f. 1. 



Specimens received from Dr. Cox seem to be scarcely distinct 

 from the M. zebra. 



Section OSILINUS Philippi. 



Osilinus PHIL. Zeitschr. f. Mai. 1847, p. 20; Handbuch der 

 Conchyl. u. Malac. p. 210. Trochocochlea "Klein" H. and A. AD. 

 Gen. Rec. Moll, i, p. 425 (1858) ; and of FISCHER, TRYON, CHENU, 

 and most authors. Caragolus MONTEROSATO Nom. gen. e spec., p. 

 43 (1884). Trochius Leach, in GRAY, 1850. "Osilin" ADANSON. 



After rejecting Klein's pre-Linnsean name Trochocochlea (not 

 properly defined until 1858), we find Osilinus Phil., the next in 

 order. 



The section is restricted to the seas of Europe in distribution. 



M. TURBINATA Born. PL 21, figs. 21-23. 



Shell imperforate, conical, very solid and thick, whitish, tinged 

 with gray, yellowish or greenish, tessellated with numerous spiral 

 series of reddish, purple or chocolate subquadrangular blotches; 

 spire more or less elevated, conoid, the apex eroded ; whorls about 6, 

 slightly convex, with impressed spiral lines between the series of 

 blotches, the last generally descending anteriorly ; base eroded in 

 front of the aperture ; aperture very oblique ; outer lip beveled to 

 an edge, thick, smooth, pearly and iridescent within; columella 

 flattened on the face, bluntly lobed within, pearly, backed by an 

 opaque white layer. 



Alt. 25-30, diam. 24-30 mill. ; alt. 36, diam. 30 mill. 



Mediterranean Sea, from the JEgean to Algiers and Spain; Portu- 

 gal; Canaries. 



Trochus turbinatus BORN., Test. Mus. COBS. Vindobon., p. 335, et 

 T. tessulatus BORN., 1. c. p. 332, t. 12, f. 5, 6 (young shell) 1780. 

 T. tessellatus GMEL., Syst. Nat. xiii, p. 3583 (in part ; not T. tessel- 

 latus GMEL., p. 3574). Monodonta fragaroides LAMARCK, An. sans* 

 Vert, vii, p. 36. HIDALGO, Moluscos Marinos de Espana, etc., t. 61, 

 f. 2, t. 62, f. 9-11. T. Olivieri PAYR., Moll, de Corse p. 133, t. 6, f. 

 15, 16. T. turbinatus PHILIPPI, Conchyl. Cab., p. 162, t. 26, f. 7-11. 



