20 BULLETIiSr 104, UNITED STATES NATIONAL MUSEUM. 



as many as thirty) short chambers, oarher ones, especially in the 

 microspheric form close and indistinct, later ones distinct with con- 

 strictions between and the sides rounded, increasing somewhat in 

 length toward the apertural end , wall of fine sand grains of even tex- 

 ture, roughened on the exterior; color gray. 



Length of microspheric adults 5-6 mm., of megalospheric 2-3 mm. 



Distrihvtion. — -The distribution of Reoj^lMx haciTiaris seems to be 

 very definite. The Cliallenger Report described and figured it from 

 Valarous station 8, southwest of Greenland, latitude 59° 10' N. ; longi- 

 tude 50° 25' W., 1,750 fathoms (3,200 meters), and mentioned 

 "some broken tests belonging to the same species" from the Porcu- 

 pine dredgings south of Rockall Bank, 420 fathoms (768 meters). 

 It was also recorded from 1,070 fathoms (1,957 meters) on the north 

 coast of New Guinea, but Brady mentions that the material except 

 from the first station is "inferior in point of size and distinctiveness." 

 The onl}^ other Oliallengcr record is station 44, latitude 37° 25' N.; 

 longitude 71° 40' W., 1,700 fathoms (3,109 meters), bottom tem- 

 perature 36.2° F. (2.3° C). This is almost in the center of distri- 

 bution shown by the Alhaiross material. 



With the four stations given by Flint, Challenger station 44 and 

 eighteen stations at which I have found the species there is a definite 

 area off our coast in which the species occurred, latitude 37°-40° N. ; 

 and longitude 68°-73° W., in which the species at certain stations 

 may be called abundant. The only other material I have is a specimen 

 very similar from Albatross station D2750 off the Leeward Islands. 



Egger records the species from the west coast of Africa and an 

 exam'nation of h's material is necessary to determine whether it is 

 the same or not. 



The material from the area in which it is so common is very well 

 characterized indeed and marked by both microspheric and megalo- 

 spheric forms. The microspheric is very tapering and has a charac- 

 teristic change of direction before the last series of chambers is added. 

 The megalospheric form is a straight or slightly curved test with the 

 chambers fairly distinct from the beginning. The early chambers 

 are larger than those immediately succeding and the appearance 

 from the exterior is that of a Clavulina. The three larger specimens 

 in Flint's figure are microspheric, the other a' megalospheric speci- 

 men. In size, shape, number of chambers, color, and the whole 

 ensemble of characters is ver}^ definite, making a well-defined species. 



Millett's figured specimen from the Malay Archipelago, while 

 suggesting this species in its tapering shape, is dift'erent in the form 

 of the chambers and especiall}^ in the aperture. I doubt very much 

 if this Malay form is identical with the well-characterized Atlantic 

 species. Chapman records it from the Arabian Sea, but this again 

 is a case where a reexamination of the material is desirable and a 

 comparison with the clear-cut characters as here shown. 



