480 NOTES ON PROSOBRANCHIATA, 



LoTORiUM FRATERCULUM, Dunker. 

 (Text fig. 5.) 

 Triton f rater cuius, Dkr., Malac. Blatt. 1871, p. 166. 

 Sipho(1) mimeticus, Tate, Trans. Roy. Soc. S. Aust., 1893, Pt. i., 



p. 189, pi. i., f. 10. 

 Triton mimeticus, Verco, loc. cit., 1895, p. 88, pi. 2, ff. 4, 4a. 

 Triton [Argohuccinum) mimeticus, Verco, loc. cit., 1896, p. 221, 

 pi. 5, ff. 6, 6a, 6b. 



Some little time ago Mr. Hedley drew my attention to the fact 



that the description given by Dunker under the above name could 



not apply to Lotorium bassi, Angas, as 



stated bySchmeltz,"^ Tryon and others. It 



subsequently occurred to me that the 



diagnosis described Tate's Sipko (?) minieti- 



cus. Thanks to the courtesy of Dr. Verco, 



who has very kindly sent me specimens 



^ . , , -Tk 1 to study, I am enabled to oive the follow- 

 L. Jraterculum, Dunker. . •" ° 



ing note on the subject : — 



The specimens do not harmonise perfectly with Dunker's 

 description, his statement that his specimens had a short canal, 

 in particular disagreeing. The description is, however, fairly 

 detailed, and, but for this, applies to the examples before me, the 

 measurements and proportions fitting exactly. Mr. Hedley agrees 

 with me that, on the whole, the species had best be known under 

 Dunker's name. It is a true Lotorium, though it cannot be 

 referred to any of my groups, and has a faint resemblance to the 

 parkinsonianum-gvow'^, but from these its rather long canal 

 separates it. 



This species has a most striking resemblance to Stre2jtosip>hou 

 porphyrostoma, Ad. & Rve.f The apex also bears no little 

 resemblance to that of the family to which Streptosiphon belongs. 

 The dentition, however, shows the species to belong to Lotorium. 



* Mus. God. Cat. v., 1874, p. 139. 

 t Reeve, Conch. Icon. iv. {Faciolaria), pi. v., f. 11, 1847. 



