102 GASTROPODA. [Aspidobranchia* 



3. Subemarginula intermedia, Reeve, 1842. Plate 8, fig. 6. 



Parmopkorus intermedius, Reeve, P.Z.S., 1842. 50 ; Conch. Syst., ii, pi. 139, 

 f. 5, 6. Tugalia intermedia, Rve. : A. Ad., P.Z.S., 1851, 88. Tugali 

 elegans, Gray, Dieff. N.Z., ii, 240. Tugalia cinerea, Gould : Sowerby, 

 Thes. Conch., iii, 221, pi. 249, f. 15-17 ; Reeve, Conch. Icon., xviu 

 f. 5, not of Gould. T. ossea, Gould: Sowerby, I.e., f. 18; Angas. 

 P.Z.S., 1867, 219, not of Gould. T. ausiralis, T. -Woods, P.R.S. Tas., 

 1877, 21. T. tasmanica, T.-Woods, i.e., 156. Subemarginula intermedia, 

 Reeve, Man. Conch. (1), xii, 285, pi. 43, f. 83, 84. 



Shell oblong-ovate, broadly rounded behind, narrower toward the 

 front, and having a shallow ernargination in the front margin. Sur- 

 face finely latticed all over by numerous close fine radiating riblets 

 crossed by close elevated concentric strise ; the posterior half near 

 the margin sometimes with beautiful concentric zigzag bands. Colour 

 light buff to blackish-green. Apex at the posterior fifth. Interior 

 white, sometimes light-greenish. Margin obtuse, finely crenulated. 



Length, 21 mm. ; breadth, 12 mm. ; height, 6 mm. Length, 

 43 mm. ; breadth, 26 mm. ; height, 11-5 mm. (Auckland specimen). 



Anatomy. --M. Tobler, Jena. Zeitschr., xxxvi, 1901, 229-74. 

 pi. 13-15. 



Dentition. Q.J.M.S. (n.s.), viii, 1868, pi. 12, f. 57. 



Type in the British Museum. 



Hal. Hauraki Gulf (H. S.) ; Great Barrier Island (Dieff.) ; Banks 

 Peninsula (Iredale). Australia. The type is from Port Jackson. 



Fossil in the Pliocene. 



Genus 4. SCUTUS, Montfort, 1810. 



Sculus, Montfort, Conch. Syst., ii, 1810, 58, 59. Type : Sciitus antipodes, 

 Montfort. Parmophorus, Blainville, Bull. Sci. Soc. Phil., 1817, 25. 

 Scutum of some authors. 



Snout of animal proboscidiform ; mantle ample, covering nearly 

 the whole of the shell, with a simple margin, fissured in front. Tentacles 

 thick, eyes at their outer bases. A row of short cirri on each side of 

 neck and foot. Gills 2, symmetrical, outside the shell, under the 

 mantle ; a round white renal opening at their apices. The whole 

 body dark blue-black ; mantle paler below ; sole of the foot white. 

 Radula as in Emarginula ; central tooth large, outer lateral tricuspid ; 

 uncini not denticulate. 



Shell oblong, depressed, apex directed backward ; no anal groove 

 or slit, but the front margin more or less truncated and sinuous ; 

 surface without radiating sculpture ; anterior ends of the muscle- 

 scar converging, but not hooked inward toward the apex. 



Distributed over the Indo-Pacific. 



Fossil in the Tertiary (Proscutum, Fischer). 



The animals are apathetic, and avoid the light ; they are found 

 under boulders between tide-marks. 



E. A. Smith has thoroughly revised the genus in an excellent 

 paper in the Quart. Journ. Conch., ii, 1879, 250. 



