SHIPWORMS OF THE PHILIPPINE ISLANDS BARTSCH 539 



Subgenus Coeloteredo Bartsch 



1923. Coeloteredo Bartsch, Proc. Bio]. Soc. of Washington, vol. 36, 

 p. 99. 



In this subgenus the blade of the pallet forms a half hollow cone; 

 that is, the outer portion is convex while the inner portion of the 

 blade is almost flat. The entire structure is very thin. The stalk 

 is short with the basal half expanded into an oval knob, which is 

 fully three times as wide as the narrower neck of the stalk. 



Type. — Teredo (Coeloteredo) mindanensis Bartsch. 



TEREDO fCOELOTEREDO) MINDANENSIS Bartach 



MINDANAO SHIPWORM 



Plate 53, figs. 10, 12; plate 56, fig. 6; plate 60, figs. 4, 8, 12 



1923. Teredo (Coeloteredo) mindanensis Bartsch, Proc. Biol. Soc. Washington, 

 vol. 36, pp. 99-100. 



Shell small, subglobular, white, the extreme anterior portion of the 

 anterior part with a moderately deep sinus that is covered with a 

 smooth callus, which is slightly reflected over the exterior portion. 

 The remaining anterior part is crossed by moderately strong dental 

 ridges which first bend downward and then backward in an even, 

 gentle curve, separated at the posterior extremity by spaces about 

 twice as wide as the dental ridges. These dental ridges slope a little 

 more abruptly dorsally than ventrally, and are very finely denticu- 

 lated at their free border. There are 42 of these in the type, in which 

 (he umbone is partly eroded. A perfect specimen would therefore 

 show a large number. The anterior part of the median area is marked 

 by closely crowded dental ridges, which are about as wide as those of 

 the anterior area. The denticles of these are quite fine. Of these ridges 

 22 are present in a line parallel to the ventral margin of the anterior 

 part. The middle median portion is slightly concave and crossed by 

 the nondenticulated decidedly curved continuations of the dental 

 ridges of the anterior median portion, and fine incremental lines. 

 The posterior median part bends rather abruptly downward to join 

 the auricle. The interior is white. The junction of the anterior and 

 median portion is marked by a rather strong cord. The middle median 

 portion forms a slightly depressed roughened groove, at the basal ter- 

 mination of which the usual strong knob is situated. The auricle 

 overlaps the posterior median portion decidedly and forms a rather 

 strong shelf. The cordlike markings described for the exterior are 

 also apparent on the inside. A strong, somewhat irregular curved 

 blade extends from the inner side of the umbone two-thirds of the 

 way toward the basal knob. The pallets consist of half a hollow 



