322 TOURNAT. OF CONCHOLOGY, VOL. I4, NO. TI, JULY, I915. 



is also Strongly and distantly spirally grooved at equal intervals 

 with six spiral lines, which cut across the longitudinals so as to 

 form beads ; the small area at the base of the canal has also traces 

 of spiral sculpture, and three spirals can sometimes be faintly 

 traced on the penultimate whorl ; under a i-inch objective on the 

 microscope all the interstitial surface is seen to be extremely finely 

 spirally striate,, except the protoconch; aperture irregularly pyri- 

 form and very small, having a distinct canal ; columella strongly 

 arcuate; peristome stout and strong, but not perceptibly thick- 

 ened, with three raised lines within the hp. 

 Long., 4'25 mm. : diam. max., 1*5 mm. : diam. max. of aperture, 



■75 m"i- 



The type specimen figured is from Lifu. It has been deposited in 

 the British Museum of Natural History. It has been perforated on 

 the side figured by some boring animal, but was selected as the type 

 as best showing sculpture and protoconch. 



Hab. I have seen specimens from Naro (Masbate Island), Bagac, 

 and Banacalan (Marinduque Island), all collected by Quadras ; 

 Hawaii (Thaanum), Mauritius, and Lifu. Kermadecs and Lord 

 Howe Island, scarce (Iredale). 



This species may be Pease's '^Rissoina costiilata, described as 

 follows : — 



"Shell elongate, fusiform, slender, longitudinally prominently 

 ribbed, striate transversely ; whorls flatly convex ; suture deeply 

 impressed, grooved ; aperture very small, ovate ; white, encircled 

 by a chestnut-brown band on middle of whorls. 



Long., 5 mm. ; diam., 2 mm. 



Locality: Paumotus." 



The figure is utterly unrecognisable, but the small mouth seems 

 distinctive. Fortunately the question of this identity is immaterial, 

 as the specific name cosfi/Iata is pre-occupied in Rissoi7ia h\-R. cosfu- 

 lata Dkr. from Japan. 



It is a common shell in the Lifu shingle, and ma\- be the forni 

 referred to by "Melvill and Standen under R. nesiotes as a tubercled 

 variety of that species. Mr. Iredale, who has been good enough to 

 examine the series in the British Museum for me, tells me that a set 

 of R. nesiotes Melv. and Stand, (ex Manchester JNIuseum) includes 

 one R. Jiiiltozona, and that a set of three R. exasperafa Souv. (ex 

 Sowerby and Fulton) consists of two R. miltozoiia and one R. exas- 

 pcj-ata. 



1 .4 iiici'icnn Jon>-n. of Condi. ^ iii. (1S67). p. 295, pi. 24, f. 28. 



2 Mai. Blatt., vi. (iS5o), p. 235. 



3 Joiini. of Conch., \iii., p. 307. 



