OF NEW SOUTH WALES. 89 



56. — DOLABELLA ECATJDATA. 



Dolabella ecaudata, Rang. Hist. Nat. des Aplys. pi. 2, p. 47, 

 No. 2. 



Hab. Home Islands, North East Australia. 



57. — Apltsia sp. ? 



Hab. Three miles south of Fitzroy Island, North East Aus- 

 tralia, found on floating weeds. 



On some Australian Species of Trochocochlea, by the Rev. J. E. 

 Tenison Woods, F.G.S., &c, Corr. Mem. L.S., N.S.W. 



The genus Trochocochlea was first proposed by Klein, in 1753 

 (Tentamen methodi ostracologicai, L.B., 1753, p. 42, ita. Her- 

 mannsen Indicis, p. 616), for a genus which cannot now be recog- 

 nized, as it includes several genera, and includes families. He 

 derived the name from rpo^os, a wheel, and ^o^Xta?, a helix. 

 The name has been revived by Messrs. H. and A. Adams (Genera), 

 and is by them defined thus : — Shell conoidal, imperforate in the 

 adult ; whorls smooth or transversely Urate, the last rounded at 

 the periphery ; aperture nearly rhomboidal ; columella thick and 

 rounded, ending in a slightly prominent tubercle. The same 

 genus has been named Trochius by Leach, Gibbium by Gray, 

 Osilinus Phil., Labio, Gray, not Oken, Melagraphia, Stentz. 

 Messrs. Adams give a list of twenty species, but they do not in- 

 clude our T. Australis, or, as it is better known, T. striolata. If 

 the genus is to be maintained it should be added that the shell 

 is nacreous, and the operculum, being horny, multispiral, and cen- 

 tral ; the mantle with small fringes and six to eight tentacular ap- 

 pendages. The odontophore is trochoid, or that which is gener- 

 ally seen in the family, namely, one prominent central tooth, 

 three or four long, curved, lanceolate laterals, and an arcuate 

 comb of uncini. 



We have three well-known forms round the Southern Coasts 

 of Australia and all Tasmania, T. constricta, T. tainiata, and T. 

 australis. The two first are doubtfully separated from one 



