REVISION OF RECENT BAIRDIIDAE 63 



Habitat. — On living corals, Tridacna, dead coral fragments, and 

 calcareous algae in the coral reef zone, Nosy Be and Tulear, 

 Madagascar. 



SuBFOssiL DISTRIBUTION. — Nosy B6; in carbonate sands from the 

 reef and lower beach zones. 



Described by Triebel from the Red Sea; possibly reported from 

 Indonesia (as T. indopacifica or T. cubensis) by Key (1953), van den 

 Bold (1946), and Kingma (1948). 



Affinities. — Appendages similar to those of T. bradyi, but readily 

 distinguished by the f urea with 7 setae, setae 5, 6, and 7 being extremely 

 short. 



Triebelina bradyi Triebel, 1948 



Figures 32a; 33a-cl; Plate 2: figure 3 



Bairdia truncata Brady (not Kirkby) 1890, p. 494, pi. 2: figs. 1, 2. 

 Triebelina bradyi Triebel, 1948, p. 18.— ? van den Bold, 1950, p. 901.— ? Key, 

 1953, p. 158, pi. 1: fig. 4.— not Puri, 1960, p. 132, pi. 6: figs. 7, 8. 



Material. — Nosy Be; one adult female and several juveniles 

 living; 21 subfossil specimens. 



Dimensions. — Adult female USNM 121325, right valve, length 

 0.55 mm, height 0.30 mm. 



Habitat. — Nosy Be; collected in washings of dead coral fragments 

 at Ambatoloaka. 



Subfossil distribution. — Sparsely distributed in carbonate reef 

 and intertidal sands at Nosy Be, Madagascar. 



Originally described from Samoa and New Caledonia by Brady 

 (1890), reported from Recent and Pleistocene of Indonesia by 

 Key (1953). 



Affinities. — Appendages similar to those of T. sertata, but readily 

 distinguished by the furca with 7 setae, setae 6 and 7 very much 

 shorter than others. Carapace distinguished from that of T. reticulo- 

 puncta by its more subquadrate outline, lack of defined ventrolateral 

 ridge, having instead two vaguely defined ventrolateral swellings, 

 and larger marginal spines. 



Triebelina reticulopuncta Benson, 1959 



Figure 33e, /; Plate 2: figures 5, 6 

 Triebelina reticulopuncta Benson, 1959, p. 44, pi. 2: fig. 1; pi. 8: fig. 4. 



Material. — Holotype specimen USNM 113123. 



Dimensions. — Left valve, length 0.58 mm, height 0.31 mm; right 

 valve, length 0.58 mm, height 0.30 mm. 



Distribution. — Bahia de Todos Santos, Baja California, Mexico. 



Affinities. — Most similar to T. bradyi of species described, but 

 not as high, dorsal margin of right valve sloping more steeply posteri- 

 orly, ventrolateral ridge more defined, smaller marginal spines. 



327-237 O - 69 - 6 



