LAMELLIERAXCIIIATA. 81 



margin minutely crenulated ; hinge with twelve posterior and sixteen 

 or more anterior teeth. Pale yellowish olive. Height, '35 ; length, '35. 

 Wellington Harbour. Australia. 



LEDA. 



Oblong, rounded in front, produced and pointed behind ; hinge 

 like Nucula, margin even ; pallial line with a small sinus. 

 Widely spread. 



114. L. ailStralis, Qno>/, I.e., \\\.,p. 471. Swollen and rounded- 

 in front, produced behind into a long slightly recurved sharp-ended 

 beak ; teeth numerous, cartilage pit not projecting. White with a 

 greenish olive epidermis. Height, - 2 ; length, - 37. 



Cook Strait ; Stewart's Island. 



SOLENELLA. 



Oval, gaping and truncated behind, valves concentrically striated 

 and covered with a brownish green epidermis ; hinge line straight, 

 with small comb-like teeth. 



South America. 



115. S. CUillingii, A. Adams. Transversely oblong, rounded in 

 front ; produced and waved behind, posterior dorsal margin slightly 

 concave ; posterior end truncated, emarginate ; ventral margin straight ; 

 valves with rather distant (about forty to an inch) concentric, rather 

 elevated stria?. Pale olive green, interior greyish white. Height, '5 ; 

 length, 1-1. 



Wellington Harbour ; Stewart's Island. 



The specimen from Stewart's Island has the posterior margin less 

 sirmated. 



FAMILY PECTIKID^E. 

 Free or adhering, eared, ligament internal. 



PECTEN. 



Oblong or sub-orbicular, regular, cquivalve, close ; valves generally 

 with scaly rays ; ears unequal, the posterior with a sinus for the 

 byssus. 



World-wide. 



116. P. zealandi88, Gray, Die/. N.Z., ii., p. 2GO. Sub-orbicu- 

 lar, valves sub-equal, inflated, with about forty radiating sub-equal 

 rough ribs, sometimes ornamented with scales ; ears very unequal, 

 margin rather undulated. Variable in colour : yellow, red, purple, or 

 brown. Height, T65 ; breadth, TO. 



Common. Stewart's Island. Chatham Islands. 



117. P. geinHTlilatTlS, Eecve. Ovate, equivalve, with numerous 

 radiating rough riLs, about twelve of which are mere prcminent than, 

 the others and ornamented with foliacccus scales ; cars very unequal, 

 the left posterior car with seven or eight sharp scales on the top ; 



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