608 Appendix to Part II. 



of the stone in which it is imbedded has rendered it impossible to 

 expose any part of the inside. 



Santa Cruz, Patagonia. 



NtJCTJLA ORXATA. — PI. II. fig. 19. 



Kucula testa postice truncatd emarginatd, superficie Uneis elevatis 

 undatis concentricis ornatd. 



A. beautiful species which apparently resembles N. Thracice- 

 formis in general shape, but inasmuch as a fragment alone has been 

 found, we cannot give a more complete character. 



Port Desire, Patagonia. 



TEIGOyOCELIA I^SOLITA. — PI. II. figs. 20, 21. 



Trigonocelia testa subovali, crassiuseuld, valde obliqud, Icevi ; area 

 ligamenti trigond, lateribus elevatis; dentibus ptaucis, magnis. 



This species is more unlike the typical form of Pectuncidus 

 than any which has come under my observation, being even more 

 oblique than the P. obliquus of De France, from which it differs 

 moreover in being smooth on the outside, and destitute of radia- 

 ting ridges. 



Santa Cruz, Patagonia. 



CuCFLL^A ALTA.— PI. II. figS. 22, 23. 



CucuRcea testa ovato-trapeziformi, subobliqud, subrugosd, umbonibus 

 distantibus, area ligameixti profundi sulcata, impressionis mus- 

 cularis posticce margine ventrali elevatd. 



There is a considerable prima facie resemblance between this 

 species and CucuUcea decussata, ' Min. Con.' This from S. Cruz 

 may, however, be easily distinguished from the British, by its 

 greater height, its more oblique form, and by the greater number 

 of impressed lines on the ligamental area. 



Santa Cruz and Port Desire, Patagonia. 



AiroiriA alterxaxs. — PI. II. fig. 25. 



Anomia testa suborbicidari, costellis radiantibus plurimis, $vh&qua~ 

 miferis, alternis minoribus. 



There is only a single valve of this species. 

 Coquimbo, Chile. 



