130 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



The opesium is often bordered by a little salient peristome, the 

 proximal border of which easily closes the trypostege. The onycho- 

 cellarium is always primoserial but all the primoserial zooecia are not 

 necessarily onychocellaria. 



Biology. — Almost all of our specimens were living, but the ovicells 

 were very rare. This is a species of rather shallow waters, 20 to 37 

 fathoms. It incrusts shell fragments, nullipores and foraminifera. 

 Our speciments were in reproduction February 16, 1908. The species 

 seems to prefer warm waters. 

 Occurrence. — 



P. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 30" E.; 20 



fathoms; S. Sh. 

 D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; co. S. 

 D. 5145. Jolo Light, Jolo; 6° 4' 30" N.'j 120° 59' 30" E.; 23 



fathoms; co. S., Sh. 

 D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; co. S., Sh. 

 D. 5151. Sirun Island, Sulu Archipelago, Tawi Tawi Group; 5° 

 24'40"N.; 120° 27' 15" E.; 24 fathoms; co. S., Sh. 

 D. 5179. Romblon Light, Romblon; 12° 38' 15" N.; 122° 12' 



30" E.; 37 fathoms; hard S. 

 D. 5192. Jilantaguan Island, off northern Cebu Island; 11° 09' 

 15" N.; 123° 50' E.; 32 fathoms; green S. 

 Cotypes — Cat. Nos. 7929-7932, U.S.N.M. 



Subfamily Microporidae Hincks, 1880 



Genus DACRYONELLA Canu and Bassler, 1917 



When we created this genus for two fossil species of the Jacksonian 

 we had no idea that it was so well represented in the recent seas. A 

 recent species therefore could be added as a second genotype, and we 

 choose Dacryonella trapezoidea for this purpose. 



The various known species can be arranged in two groups, those 

 which have interzooecial avicularia and those which have avicularia 

 symmetrically placed on the distal border of the mural rim. Only 

 D. ogivalina and D. papillata belong to the second group. These 

 differences are not of generic order. 



As in Onychocella and Velumella, the place of the opesiular muscles 

 is rather variable. When they are placed very low the opesiular 

 indentations are little apparent and the opesia are very large, as, for 

 instance, D. papillata. When they are placed very high the opesiular 

 indentations are deep and the opesia are small, as, for instance, D. 

 subvespertilio and D. vespertilio. Moreover, in the two genera men- 

 tioned there is a kind of cellular dimorphism; but we know that here 

 it appears to be in relationship with the irregularities of the 

 substratum. 



