APPENDIX, 375 



On Pectunculus (p. 162). The name P. glycimeris (p. 163) must 

 be changed to P. violascens, or, perchance, to P. pollens [Area p. 

 Lin.) ; the author's statement relative to the Linnean types, both 

 here and at page 162 (note to P. pilosus), having been an error, the 

 result of too hasty an examination. Consult Zeit. Mai. 1846 

 (P. hirtus, Ph.), and ' Malacologia Rossica' (P. septentrionalis, 

 Mid.). 



Pectunculus Siculus, p. 162, t. 19, f. 19 ... P. undulatus, p. 162, 

 t. 19, f. 26 ... P. stellatus, p. 163, t. 19, f. 31 ... P. violascens (as 

 P. yhjeimeris, p. 163), t. 19, f. 20 ... P. intermedins, p. 164, t. 19, 

 f. 21 ... P. ovatus, p. 164, t. 19, f. 22 ... P. lineatus, p. 164, t. 19, 

 f. 32 ... P. maculatus, p. 164, t. 19, f. 34 ... P. giganteus, p. 164, 

 t. 19, f. 33 ... P. radians, p. 165, t. 19, f. 25 ... P. vitreus, p. 165, 

 t. 19, f. 28 ... P. multico status, p. 165, t. 19, f. 36 ... P. parcipictus, 

 p. 165, t. 19, f. 35 ... P. aurifluus, p. 165, t. 19, f. 37 ... P. tessel- 

 latus, p. 166, t. 19, f. 23, 38'... P. morum, p. 166, t. 19, f. 43 ... 

 P. oculatus, p. 166, t. 19, f. 39 ... P. nodosus, p. 166, t. 19, f. 50 ... 

 P. pallium, p. 166, t. 19, f. 41 ... P. fcic&fcr, p. 166, t. 19, f. 42. 



Pectunculus spadiceus (t. 19, f. 18), Reeve, Z. P. 1843, p. 189 ; 

 I. Pect. f. 47. Transverse, suborbicular, equilateral, thick, ventri- 

 cose, chestnut-brown or tawny brown, concentrically incised by 

 minutely waved crowded striae, that become still more dense as they 

 recede from the umbones, and are subdecussated laterally by fine 

 almost obsolete radiating striolse which pervade the entire surface in 

 young individuals ; ventral edge strongly toothed, much and evenly 

 arcuated : beaks acute, not inclined, almost in the middle of the rather 

 small and somewhat narrow ligament : inside white ; hinge-margin 

 broad; teeth large, moderately numerous. 1£. There are traces, or, 

 as it were, shadowings out, of radiating ribs. 



Pectunculus tenuicostatus (t. 19, f. 24), Reeve, Z. P. 1843, p. 80 ; 

 I. Pect. f. 35. Suborbicular, equilateral, ventricose, rufous, obscurely 

 mottled with white, radiated throughout with very numerous rather 

 distant thread-like rounded costellae, which are crenated, sharply 

 elevated and far apart (except the extreme ones) ; their intervals 

 exhibit, under the lens, a minute similar, yet still more crowded and 

 decussated, sculpture ; ligamental margin rather short ; umbones 

 rather prominent ; beaks scarcely inclined, in the middle of the liga- 

 ment ; inside whitish, somewhat stained with brown ; teeth numerous. 

 1\. China; Australia. When mature is angulated on one side. 

 The epidermis is arranged in 3 or 4 rows between the riblets. 



Pectunculus Pectinoides (t. 19, f. 27), Desk, in Cuv. (ed. 1836), 

 t. 87, /. 8. — Reeve, I. Pect. f. 44. Lenticular, depressly convex, 

 radiately ribbed ; ribs somewhat oblique, compressed, depressly flat, 

 with the interstices delicately excavated; fleshy white, profusely 



