BULLETIN ")!), UNITED STATES NATIONAL MUSEUM. 117 



To suiiiiiiariz(> the results ()l)taiii('(l from this coiiijKirative stud}*: 



The Willi ill all the forms stuclicd is imiji'it'orato. The primaries septa are per- 

 sistentl^y ditl'erentiated from the secondaries by slightly greater length, and are iisiialh' 

 somewhat taller. The septal margins are always finely dentjitc. The columella varies 

 in size, it is composed of iiiterhu-ing, fused, small trahecuhe, and usually has a pai)illary 

 upper surface. The greatest variation in structure commonly considered of impor- 

 tance is in the i)orforateness of the septa. The species form a continuous series from 

 0. cleijanf with entirely solid septa to ( '. 2 sjk I'liilippinin^ in which the septa have 

 cyclolitoid structure. 



The species symbolized by C. 2 sp. Philippines^ deserved further consideration. 

 1 at first lalieled the s[)ecimens Fimgla dixtarta Michelin, and am by no means sure 

 that they do not belong to that species. The septal margins and septal structure are 

 identical with /"'. ilhtortn. the number of septa in each to .5 mm. (18 or li») is the 

 .same, and thei-e is no difl'erence in the costa- of the base. The specimens referred to 

 Ci/doxei'ix are thicker in the oral region. One of the C'ycloseris specimens has several 

 sharply indented lines radiating from the base, and there are indications of these lines 

 on till- upper surface. This specimen looks as if its divi.sion into Diamrix segments 

 hail been initiated, but the process not completed. The segments have remained 

 attached, but indications of the arrested division still persist. There are suggestions 

 in some of the other specimens of lines along which division might take place. These 

 < 'ijclnxerh specimens seem to me to be the C'l/cfoseris-fonn of I^untjia dixtortd, the 

 oidy distinguishing character that I can discover consisting in a few millimeters 

 difference in thickness in the oral region. Several of these specimens po.ssess .small 

 secondary mouths on their oral surfaces. 



C'(/cloxcr!x 1 xp. lliilippinex. ma}' be small specimens of F. fy<loUttJ< Lamarck. 

 They are damaged, and I should not like to identify' them specifically. 



DIASERIS. 

 DESCRIBED SPECIES OF DlASEKIS.a 



Fungia distorta Michelin (genotype). 



Diaseris freyceneti Milne Edwards and Haimc. 



Diaseris pulchdln Verrill. 



Diaseris mortoni Tenison-Wood. 



Diaseris fraxjiUx Alcock. 

 The following species originally based on the Diitxrrix-ioxwx are said to pos.sess a 

 Cycloseris-iovm : 



Fungia distortu Michelin (tide Doderlcin). 



Diaseris freyceneti Milne Edwards and Ilaime (fde Quelch). 



Diaseris ww^o?;/ Tenison-Wood {<.'. F. eyvlolliex Lamarck). 



Diaseris frag IVis Alcock (<F. patella (Ellis and Solander)). 

 The specific name Dlaxerlx pidchrUa Verrill is ignored by Doderlcin, i. e.,the 

 species is not recognized, and the name is not placed in the synonymjof any species. 



"The species described by Pourtales from tlie Atlantic are purposely omitted. 



