ISO COSTELLARTA. 



'V. FLKXicosTATA, Garrctt. 



All untiiiuivd species, allit'd to T. obeh'.^ais. Length, '6 inch. 



Polynesia. 

 T. RADIX, Sowb. ri. 53, fig. 537. 



Like ol)elii<cufi, bnt the costoi more distant, curved ; oruiige- 

 browii Avith u white superior band. Lengtli, 1 inch. 



Habitat unknown. 

 T. LOXiiisi'iRA, Sowb. I'l. 43, lig. 538. 



Fawn-colored, light banded in the iniddU'. Length, "9 inch. 



Habitat nnknowii. 



One of a number of very doubtful specimens, once forming 

 part of a private collection, and wliich, coming into tlie liands of 

 Mr. Sowerby, have been described 1)y him as new species. 



T. .Etiitovica. Jickeli. PI. 53, fig. 539. 



A miserable little young shell, the description of which is of 



advantage to Mr. Jickeli, perhaps. Length, 4 mill. 



Red Sea. 

 May be identified witli anything. 



T. CRISPA, Garrett. PI. 53, fig. 540. 



White or yellowisli white, with usually a central darker band ; 



ribs sharj), tiexuous, somewhat distant, interstices foveolate, the 



I'evolving ridges being thread-like and well raised. 



Length, T)5-'8 inches. 



Samoa and Viti Isles. 



T. KXASi'KRATA, Guielln. IM. 53, figs. 541-544 ; PI. 54, figs. 545, 

 54G. 



Whitish or yellowish usually two-banded with rhestniit to 

 dark chocolate, somcliiiu's coloi-cd oidy on the ribs. 



Length, '75-1 inch. 



lied Sea, Indian Oeeun, Jar a, Philippines, Poly ne sin. 



T. arenosa. Lam. (figs. 545, 546), is a synonym, and not 

 entitled to varietal distinction as its typical form is connected 

 with e.rasijernia by almost insensible gi-adations: Reeve's reason 

 for retaining it as a species is curious ; he says : " M. Kiener 

 regards this specties as a variety of the following (exasjjerala), 

 but I do not think it exjiedicnt to follow his opinion. One-half 

 of the establisiied species may be dispensed with were every one 

 of two that ajoproximate abandoned ui)on the discovery of their 

 intermediate link." Mr. Garrett gathered thousands of liviuii' 



A 



