180 COSTELLARTA. 



T. FLEXTCOSTATA, GaiTett. 



An unfignred species, allied to T. olx-l ixcux. Length, (> inch. 



Polynesia. 

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



Like obeliscus, but the cost;e more distant , curved ; orange - 

 hrown with a, white superior hand. Length, 1 inch. 



1 hi hi I t it Unknoirn. 



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



Fawn-colored, light banded in the middle. Length. '0 inch. 



1 1, illt u1 iinl.-iiutri,. 



One of a number of very doubtful specimens, once forming 

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

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



T. .ETiuoi'iCA, Jickeli. PI. 53, fig. 539. 



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



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



Hf.il 8ea. 

 May be identified with anything. 



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



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

 ribs sharp, flexuons, somewhat distant, interstices foveolate, (lie 

 revolving ridges being thread-like and well raised. 



Length, -65-'8 inches. 



Kiintoii (i)i,<1 VUi hies. 



T. EXAsi'KKATA, Umeliii. IM. f>: J ,, tigs. ;, II 544; I'l. f)4, tigs. 545, 

 546. 



Whitish or yellowish usually two-banded with chestnut to 

 dark chocolate, sometimes colored only on the ribs. 

 Length, -7r-l inch. 



T. (irriHtxu, Lain. (tigs. f>4f>, :*)!(;). is a synonym, and not 

 nt it, led to varietal distinction as its typical form is connected 

 with <'..r(ix/><'rti./(t. by almost insensible gradations: Rrrve's reason 

 lor retaining it as a sj)ecies is cin'ions; he says: tv M. Kiener 

 regai'ds this species as a variety of the following (('.I'ti^/icra/fi}. 

 lint I do not think it expedient to follow his opinion. One-halt' 

 (^ the established species may be <fispensed with were every one 

 of two that approximate abandoned upon the discovery of their 

 intermediate link." M r. ( Jarret 1 gathered thousands of living 



