REVISION OF RECENT BAIRDIIDAE 111 



Species included. — Recent species whose soft parts have been 

 described, by original binomen: 



Anchistrocheles fumata Brady, 1890 

 fAnchistrocheles aculeata Miiller, 1908 

 Anchistrocheles bensoni, new species 



Species assigned here on the basis of carapace structure: 



fCythere acerosa Brady, 1868a 

 Bairdia anguJata Brady, 1870 

 Anchistrocheles bradyi Scott, 1905 

 Anchistrocheles antemacella, new species 



Affinities. — The most conspicuous feature of Anchistrocheles is its 

 generally juvenile aspect as compared to Bairdiinae structure. This is 

 especially visible in the foreshortened proportions and elimination of 

 certain podomeres and setae of the antennae and thoracic legs. 

 Presumably this is the result of reduction in size. 



The widening of the fused marginal zone with increased carapace 

 compression is a trend that is seen also in certain species of Propontocy- 

 pris (Schedopontocypris) and especially in Propontocypris (Ekpontocy- 

 pris) Maddocks, as well as in many Paradoxostomatidae; in the case 

 of the latter the appendage structure is also deceptively simple. All 

 of these species characteristically inhabit the microfloral jungle 

 encrusting algae, marine grasses, corals, and coral fragment accumula- 

 tions in coral reefs and other very shallow-water habitats. 



Anchistrocheles fumata Brady, 1890 



Figure 60e, / 



Anchistrocheles fumata Brady, 1890, p. 497, pi. 3: figs. 13, 14.— Holden, 1967, 

 p. 45, fig. 35. 



Material. — Nosy Be, Madagascar; 9 specimens from 4 samples, 

 all subfossU, in carbonate sand among coral patch reefs just below 

 low tide level. 



Dimensions.— USNM 121630, left valve, length 0.61 mm, height 

 0.32 mm; right valve, length 0.60 mm, height 0.31 mm. 



Affinities. — This form is perhaps slightly more highly arched 

 dorsally than that figured by Brady. 



Dlstribution. — Reported by Brady (1890) from intertidal pools 

 of Samoa; by Holden (1967) in fossil Neogene submarine terraces of 

 Hawaii. 



Anchistrocheles bradyi Scott, 1905 



Figures 60a-d 



Anchistrocheles bradyi Scott, 1905, p. 373, pi. 1: figs. 34, 35. 



Material. — A single juvenile right valve from station LK-12, 

 Galle, Ceylon, from grassy intertidal flats. 



