OP NEW SOUTH WALES. 95 



shell constitutes a very distinct species. Its form brings it near 

 certain Turbos. It is ovately conical, sub-globose, spire some- 

 what exsert obtuse, whorls 5-6, convex, suture simple, shallow. 

 Last whorl very large, globose, very convex below, and obtuse 

 at the periphery. Surface entirely grooved transversely, grooves 

 shallow, slightly rounded, simple and never granulose, those 

 beneath the last whorl narrower than the others. Aperture 

 small, and somewhat like Trochus labio. Outer lip very thick, 

 divided into two ; interior clear white, with rather deep 

 transverse grooves. The columella is very thick, with a wide 

 exterior surface, obscurely shagreened at the end. The sinus of 

 the middle deep ; the tooth less prominent, and not rough, 

 groove separating it from the outer lip, less deep than in T. labio. 

 Colour somewhat variable, sometimes on a reddish, sometimes on 

 greenish ground. The transverse grooves are ornamented with 

 square white spots. Shell very thick and solid, rather rare in 

 collections. Found in the seas of New Holland. Diani. 34, 

 Alt. 36 rail. 



I have marked with italics a distinctive feature of the 

 columella, which is also concave. 



I may remark that old and very dry specimens of dead shells 

 have the reddish ground here referred to. I should say that the 

 specimens came from the north of Port Jackson. 



T. porcata, A , Ad. This shell is quoted by Angas, (Proc. 

 Zool. Soc., 1867, p. 216, No. 191), as a Trochocochlea, of which 

 he gives the following diagnosis : — " The whorls are strongly 

 carinate, and ornamented with narrow rose-coloured stripes, 

 longitudinally. It is equally common with the foregoing 

 species (T. tamiata). Length, 11 lines." 



But this description does not correspond with the original 

 diagnosis of Adams, (P. Z. S., 1851, Monograph oj Trochidce, p. 

 179, genus, 15, Labio, No. 22), which is as follows : — " Labio 

 test ovato-conoidea, imperforata, fusca, albo reticulata ; anfr, 

 convexis transverse carinatis ; carinis numerosis, elevatis, 

 distantibus, labio albo, inferne subcalluso, labro intus sulcato." 



