MOLLTSCA. 71 



88. Trochus (Isanda) coronata. (Plate V. figs. P-P 2.) 



A. Adams, Proc. Zool. Soc. 1853, p. 189, & 1854, pi. 27. fig. 5 ; Genera 



Bee. Moll. pi. 46. fig. 2 ; Chemn. Man. Conch, fig. 2616. 

 Var.=I. lepida, A. Adams, P. Z. S. 1853, p. 190. 



Hab. Port Curtis, 7 fms., and Friday Island, Torres Straits, on 

 tte beach {Goppinger) ; South Australia {Cuming). 



With the exception of differences in colour and the height of the 

 spires, there appears to be little or no sufficient reason why the two 

 above-named forms should be specifically separated. The subangu- 

 lation of the bpdy-whorl, said to exist in /. lepida, is very slight and 

 equally present in /. coronata. The types of the latter are described 

 as being ornamented with white transverse lines and brown spots, 

 arranged in transverse series and having a broad white band at the 

 sutures. This band is not in fact at the suture, but just below the 

 coronation of the whorls, the latter portion and the channelled top 

 being coloured like the greater part of the shell. This style of 

 painting is far from constant. Two specimens presented to the 

 British Museum by A. Adams, Esq., lack the conspicuous white 

 band, but have the entire surface covered with oblique, slightly 

 wavy, pinkish-brown stripes, resting upon a pinky-white ground. 

 A single specimen dredged by Dr. Coppinger at Port Curtis exhibits 

 the typical coloration, with the exception of having a second white 

 transverse zone just below the periphery of the last volution. 

 Another example from Friday Island more nearly resembles the 

 variety previously mentioned ; but the oblique stripes are less 

 regular, being more interrupted and in the form of spots. 



Mr. Adams describes the inner lip of this genus as " straight, 

 forming an angle with the outer lip." This description is scarcely 

 accurate. All the specimens which I have examined have the 

 columella a little oblique, slightly incurved at the upper part and 

 middle, and then prominent anteriorly, terminating in an indistinct 

 subtruncation, or, in other words, it is subnotched at the base at the 

 termination of the double series of tubercles surrounding the umbi- 

 licus. It is very slightly expanded and connected with the upper 

 extremity of the outer lip by a thin callosity (which is snbtubercular 

 in adult shells) upon the whorl close to the end of the columella. 

 The aperture has a thin coating of nacre, which in worn shells is 

 not very apparent. 



89. Trochus (Calliostoma) speciosa. 



ZizipHnus speciosus, A. Adams, Proc. Zool. Soc. 1854, p, 88 ; Peeve, 

 Conch. Icon., Zizyphinus, sp. 9, figs. 9 a, b. 



Hob. Port Curtis, Queensland, 7-11 fms. (Coppinger); Moreton 

 Bay (Mr. Strange). 



In form this species approaches T. corntus of Philippi, which, 

 however, in addition to difference in colour, does not possess the 

 peculiar smooth orange-yeUow callosity at the umbilical region so 



