OF NEW SOUTH WALES. 93 



T. c. has the eight filiaments at equal distances along the sides, 

 and T. t. has four at each side close together and posterior. The 

 tentacles are conspicuously celiated in T. c, but with fewer 

 hairs in T. t. The following are my notes on the odontophore 

 of T. c. (lingual ribbon) as seen with a binocular, \ inch objective 

 and reflected light : — One central broad quadrate tooth with 

 semicircular edge ; laterals five on each side, long, linear, curved 

 with broad rounded edges ; they are close together and increase 

 in size towards the margin. The laterals are flanked by a close 

 series of uncini, which are disposed in combs curved spirally, 

 and appear like a rope with close strands ; the latter is a feature 

 common to all the Trochidce, but here the uncini are longest in 

 the centre of the comb. The plates of the teeth are very pecu- 

 liar, the central one spreading like a broad rhomboid with a 

 narrower square base, which is plainly seen through the trans- 

 parent substance. The laterals have also a plate which overlaps 

 the next succeeding ; the transverse series is a curved line. The 

 odontophore of T. c. was in all respects similar. 



I come now to Quoy and Gaimard's Trochus striolatus, which 



goes by the name of Trochocochlea striolata and T. concamerata, 

 but which was formerly, I believe, described by Lamarck as 

 Monodonta australis (Anim. s. vert., vol. 7, p. 35, No. 11) 

 Chemnitz. Its synonomy I shall notice presently. Quoy and 

 G. thus describe it : — " T. t., ovato-conoidea, imperforata, solida, 

 transversim sulcata, nlgricante, lineolis luteis longitud, ornata, aper- 

 tura semicirculari, alba, fauce angusta. This Trochus," they con- 

 tinue, " is round, slightly globose and transversely grooved. Its 

 aperture is semi-circular, of a white nacre, and bounded by a 

 double lip ; its columella is slightly bidentate ; its colour is a 

 deep black, agreeably chequered with yellow in very fine lines 

 lengthwise, and like spots on each groove. It has some relation 

 to the strawberry Monodcnta of Lamarck. Its aperture is 

 different, its ribs more marked, closer together, and its line of 

 spots more regular. The animal has villous tentacles, brown and 

 clear, the eye stalks thick ; tentacles, as well as the lateral 

 fringes of the front green, with eight filiaments of the same 



