544 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



1 ion of the anterior and middle part marked by a somewhat irregular- 

 callus; the middle portion of the median part is marked by a rough 

 slightly concave area which terminates ventrally in a strong knob. 

 The posterior auricle extends over the posterior portion of the med- 

 ian part as a shelf with a conspicuous cavity behind it. It is trans- 

 lucent and shows the markings of the outside within. From under 

 the strong umbone a strong, somewhat curved and twisted blade 

 extends for about half the length of the shell. Pallets rather long, 

 the stalk quite long, expanded toward the blade with a strong median 

 groove on the outside which renders the pallet doubly cusped. The 

 expanded blade bears a strong excavation immediately below the two 

 lateral terminal horns. On the inside they are spoonshaped, showing 

 the extension of the stalk prominently almost to the tip of the pallet. 

 The extreme distal portion of the pallets bears thin membranes. 



The type (Cat. No. 310904, U.S.N.M.) was collected by the United 

 States Bureau of Fisheries Steamer Albatross Philippine Expedition, 

 at station 5189 off Pecador Island, Tenon Strait, in 300 fathoms on 

 green mud bottom, bottom temperature 62.8°. It measures: Height, 



2 mm.; length, 1.6 mm.; diameter, 1.8 mm. The pallets measure: 

 Length, 4.2 mm., of which 2.G go to the stalk; diameter blade, 0.9 mm. 

 Cat. No. 310965, U.S.N.M., contains a lot of specimens taken from 

 the same piece of wood, as well as a large piece of infected wood. 

 Cat. No. 466131-A contains a specimen dredged at station 5243 off 

 Pujada Bay, eastern Mindanao, in 218 fathoms on gray mud bot- 

 tom, bottom temperature 63.6°. 



Ungoteredo, new subgenus 



Pallet of the shape of Coeloteredo, but with a calcareous portion 

 in the blade which consists of two deep pits with a calcareous border 

 separated by a deep median slit. The expanded portion reminds one, 

 when viewed from the outside, of a goat's hoof with the toes point- 

 ing toward the stalk. It is not unlike Teredothyra, but the expanded 

 blade is very short and broad. The shell is typically teredine. 

 The posterior auricle extends over the posterior median portion form- 

 ing a shallow shelf. 



Type.— Teredo (Ungoteredo) matacotana Bartsch. 



KKY TO THE SPKCIK3 Of TilK SUBUENl'S OF UNQOTEKEl'O 



Pallets with a double transverse groove below the double cupped portion. 



chamberlaini. 

 Pallets without a double transverse groove below the double cupped portion. 

 Pallets with a single transverse groove below the double cupped portion. 



Cups separated by a deep median longitudinal cut _ matocotana. 



Cups not separated by a deep median longitudinal cut. 



Cups separated by an impressed line only pujadana. 



