MOLLUSC 'A. 99 



is partly enclosed when the valves arc shut. Cardinal teeth two in 

 each valve, those of the right most prominent . Front dorsal margin 

 of right valve narrowly grooved just within, simple in the left. 

 Corselet linear. Posterior muscular impression rotund-pyriform, 

 anterior more elongate. Pallial sinus moderate, extending forw 

 beyond the middle of the valve. Length 19 1 millim., height 10, 

 diani. 5. 



Hob. Prince of Wales Channel, 9 fms. 



A very elongate narrow species, recalling to mind certain slender 

 forms of the genus Donax. 



2d. Tellina semen. 



Hartley, Thesaurus, vol. i. p. 249, pi. oO. tig. 8; (? Sowerby, Conch. 

 Icon. vol. xvii. fig. 232, bad!). 



Hah. Thursday Island, Torres Straits, in 5-7 fms. 



Among the specimens from this locality is one of a purplish-rose 

 tint, the rest being white like the type. The hinge of this species 

 is composed of two cardinal teeth in the right valve (the posterior 

 one larger and bifid, with one lateral tooth on each side and a groove 

 between it and the margin), and of a single bifid cardinal in the left 

 valve with a marginal lateral tooth or prominence on each side. The 

 pallial sinus is very large, almost reaching to the anterior scar. 



The form of this species is very similar to that of T. obtusalis, 

 Deshayes, which is the same as T. malaccana, Sowerby (Con. Icon, 

 figs. 281 a and 125). The posterior end, however, is not so obtuse 

 and the form is not so like that of a Donax. In T. obtusalis the 

 concentric stria3 are rather coarser than in the present species, and 

 become very much finer anteriorly, so that in that part the shell is 

 more glossy and comparatively smooth, which is not the case in 

 T. semen. Another form, T. semitecta, Sowerby, from Xew South 

 Wales, is very closely related to the present species, and is mainly 

 distinguished by its rather more elongate form, and finer and less 

 elevated sculpture at the hinder extremity. 



26. Syndosmya elliptica. (Plate VII. figs. C, C 1.) 

 Tellina elliptica, Soioerby, Conch. Icon. fig. 223 (bad !). 



Hub. Port Jackson {Ancjas and Cqppinger). 



The type and a second specimen of this species were presented to 

 the British Museum by Mr. Angas in 1871. Neither of these nor a 

 third collected by Dr. Coppinger exhibit the sinuation at the pos- 

 terior end of the ventral margin depicted in Sowerby 's figure. His 

 words " concentrically ridged behind the angle " are scarcely appli- 

 cable, for in the first place there is only the feeblest indication of an 

 angle and the sculpture behind it consists of mere concentric stria- 

 tion. The hinge-characters show this species to belong to the genus 

 Syndosmya, and Tellina simplex of the same author (Conch. Icon, 

 sp. 240) requires a similar location. The hinge of the present species 

 consists of two cardinal teeth in the right valve, the posterior larger 



h2 



