180 COSTELLABIA. 



T. FLEXICOSTATA, Garrett. 



An unfigured species, allied to T. obeliscus. Length, -6 inch. 



Polynesia. 

 T. RADIX, Sowb. PL 53, fig. 531. 



Like obeliscus, but the costse more distant, curved ; orange- 

 brown with a white superior band. Length, 1 inch. 



Habitat unknown. 

 T. LONGISPIRA, Sowb. PI. 43, fig. 538. 



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



Habitat unknown. 



One of a number of very doubtful specimens, once forming 

 part of a private collection, and which, coming into the hands of 

 Mr. Sowerby, have been described by him as new species. 



T. ^ETHIOPICA, 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 with anything. 



T. CRISP A, Garrett. PL 53, fig. 540. 



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

 ribs sharp, flexuous, somewhat distant, interstices foveolate, the 

 revolving ridges being thread-like and well raised. 



Length, '65-'8 inches. 



Samoa and Viti Isles. 



T. EXASPERATA, Gmelin. PL 53, figs. 541-544 ; PL 54, figs. 545, 

 546. 



Whitish or yellowish usually two-banded with chestnut to 

 dark chocolate, sometimes colored only on the ribs. 



Length, *75-l inch. 



Red Sea, Indian Ocean, Jar a, Philippines, Polynesia. 



T. are nosa, . Lain. (figs. 545, 540), is a synonym, and not 

 entitled to varietal distinction as its typical form is connected 

 with exasperata by almost insensible gradations: Reeve's reason 

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

 regards this species as a variety of the following (exa^peratci), 

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

 of the established species may be dispensed with were every one 

 of two that approximate abandoned upon the discovery of their 

 intermediate link." Mr. Garrett gathered thousands of living 



