290 scutus. 



Patella unguis L., Mus. Uhlricse p. 69 ; Syst. Nat. xii, p. 1260 

 (pt.). — Hanley, Ipsa Linn. Conch, p. 5, 24, t. 3, f. 4. — Scutus un- 

 guis Ad. (pt.), P. Z. S. 1851, p. 221.— E. A. Smith, Journ. of 

 Conch, ii, 1879, p. 261. — Parmophorus granulatus Blainv., Bull 

 Sci. Soc. Philom. 1817, p. 28. — S. granulatus Ad. in Sowb., Thes 

 248, f. 3 ; t. 249, f. 20.— Sowb., Conch. Icon. f. 2a-b.— P. imbricatus 

 Q. & G., Astrol. t. 69, f. 17, 18.— P. corrugatus Rye., Conch. Syst 

 t. 139, f. 1.— S. corrugatus Ad., P. Z. S. 1851, p. 222.— Sowb., Thes 

 t. 249, f. 7 ; Conch. Icon. f. 3a-b. — Tapp.-Can., Viag. Magenta p 

 70. — P. japonicus Canefri, /. c. t. 2. f. 8, dentition. — P. elegans 

 Gray, Annals of Philos. 1825, p. 139. — Emarginula brevicula Sown 

 (not P. breviculus Blainv.), Genera, f. 2. — P. breviculus Sow. 

 Chenu, Manuel i, f. 2810.— S. angustatus A. Ad., P. Z. S. 1851, p 

 222.— S. breviculus A. Ad. (not Blainv.) in Sowb. Thes. t. 249, f. 6 

 Sowb. in Conch. Icon. f. 4. — S. elongatus A. Ad., (not Blainv.) 

 Thes. f. 21 ; Sowb. in Conch. Icon. f. lc. — Parmophorus emargina 

 tus Phil., Zeitschr. f. Mai. 1851, p. 89. — P. ruppeli Phil., I. c. p 

 89, =P. australis Ruppel, (not Lam.) Atlas Reise in Nord Afrika, 

 t. 10, f. 5. 



This shell differs from the two preceding in being corrugated on 

 the whole or some part of the surface. The varieties pass into one 

 another by such imperceptible degrees that any division must be 

 artificial. Fig. 8 represents the type shell of Linne ; fig. 4 is Reeve's 

 corrugatus ; figs. 5 and 6 are the granulatus of Blainville, and re- 

 present the Australian type, which is much corrugated and rather 

 elevated ; fig. 7 is a broad form with subcentral apex. 



Unrecognized, unjigured and spurious species of Scutus. 



P. fissurella Blainv. P. patelloideus Cantr. = Tylodina. 



P. sinensis Blainv. P. intermedms Rve.— Tug alia. 



P.fragilis Blainv. P. abnormis ~Nev.=Pholas, (dorsal plate.) 



P. gibbosus Anton. Scutum dacic am Wa\ch.=Pholas, (dorsal plate.) 



