18S MR. G. F. ANGAS ON AUSTRALIAN MOLLUSCA. [Feb. 14, 



12. Tritonium FUSIFORME. 



Triton fusiformis, Kiener, Icoiiog. Coq. viv. p. 36, pi. 5. f. 2. 



T.fusiforme is generally distributed, dwelling amongst the rocks 

 in the various bays of Port Jackson. It is a solid, tubercled shell, 

 with an elevated spire, "the surface being covered with raised granu- 

 lated strise, from which the epidermis springs in short curved bristles. 

 Fine large specimens measure 2\ inches in length. 



13. Tritonium (Gutturnium) exaratum. 



Triton exaratus. Reeve, Conch. Icon. Triton, pi. 13, sp. 50. f. a, h. 



This characteristic species is of somewhat rare occurrence. The 

 canal is rather long, and the transverse ridges of the shell stand out 

 boldly, the whorls being peculiarly flat and indented at the sutures. 

 The epidermis forms a long fringe-like frill running along the sum- 

 mits of the varices. Specimens about half the size of the Port Jack- 

 son ones are found at Moreton Bay, and a still smaller variety, more 

 or less banded, occurs in Botany Bay. Length 2 inches 3 lines; 

 Botany Bay specimens 13 lines. 



14. Tritonium (Simpulum) olearium. 



Murex olearium, Linn. 



M. costatus. Born. 



M. parthenojms, Dillw. 



Triton succinctus. Lam. 



T. lyratum, King, MS. Australian Museum. 



This fine species from Port Jackson bears too strong an affinity to 

 the T. olearium of Linnaeus (which is an inhabitant of the Mediter- 

 ranean) to allow of its being described as a distinct species. On a 

 careful comparison of specimens from both localities no specjfic dif- 

 ferences present themselves, although the epidermis is miore diffuse 

 on those found in Port Jackson. It occurs also at Moreton Bay. 

 Length 4| inches. 



15. Tritonium (Cabestana) spengleri. 



Murex spengleri, Chemn. ; Reeve, Conch. Icon. pi. 11. f. 36. 



Triton spengleri. Lam. Anim. sans Vert. ix. p. 627. 



A common species amongst the rocks in Port Jackson, and along 

 the reefs outside the Heads. It is allied to T. barthelemyi, Bernardi, 

 and T. waterhousei, Ad. & Angas, which occur in South Australia, — 

 also to T. cutaceum of the Mediterranean. It ranges from Moreton 

 Bay to Tasmania, and is also found in New Zealand. A very small 

 variety is found in Botany Bay, only an inch long. Length 4 inches. 



16. Tritonium (Cabestana) boltenianum. 



Tritonium boltenianum, A. Adams. 



A very interesting species, somewhat allied to T. spengleri, but 

 smaller, more ponderous and without varices. The young shells 

 are peculiarly inflated, and banded inside with dark purple ridges. 



