TYLODINA. 187 



calleuse, patelliforme, 4 tentacules, les 2 posterieurs eloignes et plus 

 grands, branch ies dorsales sous la coquille a droit, anus a la droitdu 

 cou. T. punctulata poiutille de brun, tentacules obtus; coquille 

 lisse." 



Gray's T. atlantica, collected by Me Andrew at Canary Is. (erro- 

 neously said by Gray to be from Madeira), is thus described : "Shell 

 solid, bright yellow ; periostraca ? " 



Parmophorus patelloideus C&ntr&iuQ has also been referred to Urn- 

 braculiun mediterraneum, young ; but I do not know that Can- 

 traine's type has been compared with either that species or the 

 present one. 



T. RAFINESQUII Philippi. PL 73, figs. 84, 85. 



Shell elevated-conical, rounded-ovate, white, but covered by a 

 yellowish cuticle ; smooth, showing but slight growth-lines. 



Length 10, breadth 81, alt. 6 mill. 



Catania and Palermo, Sicily (Phil., Arad. & Ben.) ; Adria-Zara, 

 (Brusina) ; Algeria (Weinkauff), in laminarian and coralline 

 zones. 



Tylodina rafinesquii PHIL., Enum.\ Moll. Sicil., i, p. 114, pi. 7, f. 

 8a, b (1836) ; ii, p. 89. ARADAS & BENOIT, Conchigliologia viv. 

 mar. della Sicilia, p. 122. MONTEROSATO, Nuova Rivista Conch. 

 Medit., p. 49. T. raffinesquei Phil., WEINKAUFF, Conch. Mittelm., 

 ii. p. 178. T. titrina LOCARD, Coq. Mar. des Cotes de France, 

 1892, p. 18, f. 4. 



The shell of this species is rounder and more elevated than that of 

 T. citrina. 



T. DEUBENII Loven. 



Shell ovate, depressed-conic, obsoletely angulate-radiate, with 

 nearly two sinistral nuclear whorls at the recurved apex. Animal 

 oblong, the head without a rostrum, deeply slit in front into lanceo- 

 late lobes; with ear-shaped vibracula; gill on the right side, the 

 subtubular anus behind it ; foot strong, thick, the sole ovate. Color 

 of animal and epidermis purple, 10'7 by 8'5 mill. 



Coast of Norway. 



T. duebenii LOVEN, Ind. Moll. lit. Scand. occ., p. 19. 



This unfigured species is mentioned by Sars (Moll. Reg. Arct. 

 Norv. p. 363), but no additional information has been published so 

 so far as I can find. 



