201 



Teredo uffinis Dfshayes (1863). l^'itjurc 73. 



Shell. Similar to that of T. funiltatus, but with the anterior lobe in general narrower and the 

 auricle broader, differences which have been fairly constant in all the specimens examined. 



Pallets. Stalk long and slender; blade consisting of a short, urn-shaped calcareous base, surmounted 

 by a dark brown, chitinous distal portion, wholly uncalcified, and of very irregular shape. In speci- 

 mens considered typical the distal portion consists of a narrow, elongate, cupped median extension, 

 very deeply excavated on the outer, less deeply on the inner face; and further cut away on each side nearly 

 to its juncture with the calcareous base, where the chitinous portion is spread out abruptly and slightly 

 excavated to form two shallow lateral cups. As a result of wear the median extension may be excavated 



Fig. 72. Teredo diegensis. I. Posterior ends, showing pallets and siphons. 2. Pallets with corneous 

 tips removed. 3. Normal pallets. 4. Entire animals, showing enlarged brood sac, with enclosed larvae. 

 All figures larger than natural size. 



nearly to the base, within as well as without, so that the pallet appears to end in two slender leathery 

 fingers. The lateral excavations are usually unequal, and one or both may be entireh' lacking. The 

 calcareous base is cut off abruptly at its juncture with the distal chitinous portion. 



Notwithstanding the irregularity in the form of the pallets, the characteristic leathery distal pro- 



