6 14 Appendix to Part II 



Teeeitella Patagoxica. — PI. III. fig. 48. 



Turritella testa elongato-conicd, anfractibus decern, 3 ad 4 costatis, 

 costis, intermedia anticdque subobsoletd minoribus, posticd sub- 

 acuta, subgranosd majori, tertid carinam efformante ; suturd 

 indistinct a. 



This Turritella is probably only a variety of T. eingulata, and 

 it more closely resembles this species, even than the following 

 ones, inasmuch as its volutions increase in size more rapidly than 

 in either the T. Chilensis or T. ambulacrum. In some respects 

 this resembles T. carinifera of Deshayes ; it is not however nearly 

 so long in proportion to its width. I have adopted a name sug- 

 gested by D'Orbigny. 



Port Desire, Patagonia ; and fragments at Navidad, Chile. 



Teeeitella AiiBrLACBTm:. — PI. in. fig. 49. 



Turritella testa elongato-turritd, anfractibus decern, spiraltter tri- 

 costatis, posteriorum costis cequalibus, anteriorum costd anticd 

 post ted que major ibus, intermedia minor i; suturd in sulcumpro- 

 fundum positd. 



A very remarkable species, which somewhat resembles a re- 

 cent one in my possession ; the two may however be easily distin- 

 guished. In the recent species the two spiral ridges are much 

 nearer to each other than they are in the fossil ; and the spiral 

 groove at the suture is much deeper and narrower in the fossil 

 than in the recent. 



Santa Cruz and San Julian, Patagonia. 



TEEEITELLA CHILEN'SIS. — PI. IV. fig. 51. 



Turritella testa elongato-turritd, anfractibus decern, ventricosis f 

 spiral iter tricosiatis, costis granulosis, intermedia majori, suturd 

 in sulcian positd. 



Nearly related to Turritella eingulata (Sowb. ' Tank. Cat.') ; it 

 is even questionable whether it might not be regarded as a variety 

 of that species, along with T. Patagonica and T. ambulacrum. 

 In deference to the opinion of D"Orbigny, who has suggested the 

 name, I have been induced to describe it. The principal differ- 

 ence "between this and T. eingulata are, the form of the volutions, 

 which in this are ventricose ; the absence of narrow intermediate 

 ridges ; and the greater depth of the groove in which the suture 

 is placed. From T. ambulacrum it differs principally in the cir- 

 cumstances of the central rib being the most prominent, while in 



