MARINE MOLLUSCA. 613 
203. Pterocera lambis, Linn. 37, V/. IX. 
204. Pterocera chiragra, Linn. 37, V/. IX. 
205. Terebellum terebellum, Linn. (Terebellum punctatum, Reeve, 37, VI.) II—VI, X. 
Family CERITHITDAE. 
206. Triforis corrugatus, Hinds, 20,a,8. X. 
207. Triforis elegans, Hinds, 20, a (7. pictwratus, Sowerby, 40,¢). IX. ' 
I have compared the type of 7. pictwratus with authentic specimens of the present species 
and have no hesitation in pronouncing them specifically the same. Although Mr Sowerby described 
his shell as having three keels on a whorl, there are in fact four, and they alternate, larger and 
smaller, as stated by Hinds. No mention is made by either author of the spotted carina below 
the periphery of the body-whorl. Triforis is a genus which wants monographing by a competent 
person, and ought to be illustrated with much enlarged photographed figures. At present it is 
practically impossible to identify most of the described species by means of the published figures 
and descriptions. 
208. Triforis sculptus, Hinds, 20,a. XIV. 
This species varies much in size, and is sometimes considerably larger than the shell figured 
by Hinds or the dimensions given in his original description’. The largest specimen in the British 
Museum is 20mm. in length, whereas another, equally adult, is only 15. 
209. Triforis lilaceocinctus, n. sp. (Pl. XXXYV. fig. 15). XIV. 
Testa elongato-pupoidea, supra acuminata, granulis flavescentibus et albis, lirata, inter granula 
rufo punctata; anfractus circiter 15, superiores liris duabus granosis aequalibus instructi, pauci 
anteriores lira graciliore mediana, dilute lilacea, vix granulata ornata, sutura lineari sejuncti, micro- 
scopice spiraliter striati, ultimus circa basim lilaceus, liris aliis tribus nodulosis, rufo punctatis, 
instructus; apertura obliqua, piriformis ; canalis parvus, dextrorsus, semiclausus. 
Longit. 10} mm., diam. 3} mm. 
A general glance at this pretty species gives the impression that the whorls have each two 
adjacent rows of large granules, Such however is not the case. It is the lower row in one whorl 
being adjacent to the upper one in another (the linear suture being between) that gives this 
appearance, the unspotted and more slender median lirae also lending to the effect. This lira 
gradually dies out as it ascends the spire, so that the upper whorls have only two rows of equal 
sized granules. This species also occurs at the Mauritius (Brit. Mus.). 
210. Triforis excellens, n. sp. (Pl. XXXYV. figs. 16, 17). V. 
Testa magna, dilute fuscescens, hic illic saturatius maculata; anfractus numerosi (25—30), plani, 
cingulis tribus aequalibus acutis cincti, inter cingula laeves, ultimus ad peripheriam bicingulatus, 
infra vix convexus, liris 4—5 instructus; apertura irregulariter quadrata; labrum tenue; columella 
callo reflexo crassiusculo induta. 
Longit. 29 mm., diam. 6 mm. 
The spirals are equal in size, but the space separating the lowermost from the median one 
is a little broader than the groove between the upper two. The suture except at the upper part 
of the spire is marked with a spiral thread, 
1 Ann. Mag. Nat. Hist. 1843, vol. x1. p, 17. 
