134 



larger diameter, and when protruded is barely an inch in 

 length; its extremity is furnished with 1215 white, short 

 cirrhi, of more uniform length than in the branchial ; it has 

 not the dark terminal margin of points : the usual hyaline 

 valve was not observed, but it probably exists. 



This siphonal apparatus has the entire aspect of that of the 

 typical Tellinidee ; but its position when exserted is singular, 

 being very little posterior to the centre of the ventral range, 

 instead of being, as is more usual, protruded from a posterior 

 angle somewhat more basal than a right one to a vertical line 

 drawn from the beaks to the ventral centre; this nearly central 

 basal site is occasioned by the great size and low position of 

 the posterior adductor, which necessarily compels the issue I 

 have described. 



The foot is white, not large, flat, bevelled, pointed, very 

 little geniculated, without a byssal groove, scarcely differing 

 from the Tellincs and some of the Veneres ; it also, from the 

 causes assigned to the siphons, has a more basal position than 

 usual when protruded, with a very limited anterior action, 

 from which it may be inferred that the motive power is con- 

 fined to the turning from side to side and on its centre. The 

 branchiae are subcircular, the upper plates being much less 

 than the lower, half lapping on them, pale drab, with mode- 

 rately fine but not very distinct pectinations ; the pair of palpi 

 on each side are fleshy, rather long, triangular, pointed, 

 strongly pectinated on the outsides, smooth within, and con- 

 nected with each other around the mouth ; they are also light 

 drab. The body is pale pink, small and subglobular, having 

 the foot fixed to its centre. The liver is grass-green. I have 

 already alluded to the texture of the shell, but it is necessary 

 to add, that in the right valve there are two laminar primary 

 teeth, and in the left two similar ones, with a strong double 

 tooth between them : there are no laterals. 



It would then appear, that the texture of the shell, the two 

 laminar teeth in the right valve, and the exact similitude to the 

 typical Tellime , of the very long, slender, divergent siphonal 

 apparatus having each tube completely separated to the base, 

 ally this animal by many degrees nearer to the Tellinida than 



