< II wii'.i i;i i\ : m i:iiii'ui)\ OP THE AUSTRALIAN REGION. 221 



634. Triooniulus [ncommodus Carl. 

 Abhandl. Senekenb. gesellsch., 1912, 34, p. 274." 



[iOCALTTT. K < i Island: Great Kci: Elat. 1 



635. Triooniulus ceramicus Attema. 

 Bijdr. dierk., L915, 20, p. s, fig. 11 is. 1 



LOCALTTT. W. ( Vram: Honitotu. 1 



636. Triooniulus ternatensis, sp. nov. 

 Type. M. C. Z. 4,786. Ternate (Thomas Harbour). 



The color is black excepting the flavous, covered anterior zone and a flavous 

 Btripe along caudal margin which is very narrow above but widens and be- 

 comes more ferruginous down the sides. Anal scutum black excepting a 

 very narrow flavous caudal border; the valves black proximally, fulvous 

 caudally. Legs and antennae fulvous. 



Head smooth. Sulcus absent in vertical and frontal regions but traceable 

 below, lives fully twice their diameter or a little more apart. 



Collum of usual form. Smooth, wholly lacking striae or impressions. 

 Ma ruinations as usual. Rounded below and about the anterior angle while 

 the posterior angle is subrectangular. 



Zonites strongly striate below level of the pores, each stria curved ventrad 

 at the sulcus and rising obliquely in front of it. Across the dorsum between 

 the pores along the position of the suture as series of pronounced, coarse, 

 impressions, in outline horseshoe-shaped to circular, the zonites otherwise 

 wholly smooth above, these markings forming a salient characteristic of the 

 species. Two or three such impressions may also occur below the pore. The 

 suture proper absent as such, but represented by a wider depression or furrow, 

 especially below. 



Anal scutum rounded behind, equalling the valves, wholly smooth. Valves 

 smooth, mesally very weakly and very narrowly margined. 



Number of segments, forty-eight. 



Width (female), 3.2 mm. 



637. Trigoniulus eurhabdotus, sp. nov. 



Type.— M. C. Z. 4,778 r Ternate (Thomas Barbour). 

 Diameter (male), 2.G mm. 



Fulvous or ferruginous beneath and up the sides to or nearly to the level of 

 the pores and in a narrow median longitudinal dorsal stripe, the remaining 

 portion of the dorsum between pore-series being black. Legs fulvous. 



