90 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



another, and I believe are only varieties ; the third named has 

 a host of synonyms. T. constricta is mainly distinguished by its 

 round keels. It is marked in Port Jackson with broad reddish 

 brown zigzag bands on a dull yellow ground ; raised and very 

 prominent rounded keels, and somewhat corrugated fine trans- 

 verse and oblique striae. It is this form of the shell which 

 Messrs. Quoy and Gaimard describe as T. tceniata. The other 

 variety which more strictly deserves the name of tceniata, has 

 obsolete keels, and the transverse striae are less pronounced ; the 

 shell is more oblique and conical, and marked with numerous zebra- 

 like fine zigzag black, brown, reddish, or green lines ; the name 

 T. tainiata is, however, clearly a synonym for T. constricta. If 

 it be applied to the variety with the fine stripes it is not the one 

 to which Messrs. Quoy gave the name. But I doubt whether 

 there is any use in preserving the name at all. As far as my 

 observations go no permanent mark of distinction between the 

 two varieties can be relied on. There seem to be some differ- 

 ences in the animals, but in the same variety they differ from 

 one another to the same extent. There is no difference in the 

 odontophore or lingual ribbon, which I shall describe further on. 



I now give some history of the synonomy of the species : — 



Trochus Tceniatus, Quoy and Gaimard, Voyage de V Astro., vol. 

 3, p. 251, pi. 63, figs. 15, front view 16, back view 17, animal. 



This figure is the largest of the genus now recognised as 

 Trochocochlea. It appears to me like a " striped " Trochocochlea 

 constricta, but I have only met with specimens thus striped on 

 the N. S. Wales coasts. The following is the text : — T. t. ovata 

 conoidea, imperforata, crassa, hasi dilatata, rotunda, transverse 

 carinata, lutea, vittis longitudinalibus undulatis subrubris aut fuscis 

 omata, labro albo, intus sulcato, peristomata tainiata, columella Icevi. 



I translate the following observations : — " It is astonishing 

 that this remarkable species, so common on the rocks about Port 

 Jackson, has never before been figured. It is solid conical, ele- 

 vated, dilated and rounded at the base, strongly keeled on three 

 whorls, which are rather rugged. The aperture is semi-circular, 

 white, slightly nacreous and grooved ; the peristome forms a 



