134 PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY. 



Pavonia complanata Verrill, op. sup. cit., p. 45; for synonymy, description, and distribu- 

 tion, see p. 135 of this paper. 



Pavonia gigantea Verrill, Proc. Bost. Soc. Nat. Hist., vol. 12, p. 395, 1869; 1 rans. 

 Conn. Acad. Sci., vol. 1, p. 543, plate 9, figure 7, 1870; Pearl Islands, Panama. 



Pavonia clivosa Verrill, Proc. Bost. Soc. Nat. Hist., vol. 12, p. 395, 1869; Trans. 

 Conn. Acad. Sci., vol. 1, p. 544, plate 9, figure 8, 1870; Pearl Islands, Panama. 



Lophoseris repens Brueggemann, see under Pavona varians, p. 138 of this paper. 



Pavonia seriata Brueggemann, Mus. Godefroy, Jour., Heft 14, p. 206, 1879; Island of 

 Ponape. 



Pavonia minor Brueggemann, op. sup. cit., p. 207; Island of Ponape. 



Pavonia prismatica Brueggemann, op. sup. cit., p. 207; Bonham Island. 



Pavonia percarinata Ridley, Ann. Mag. Nat. Hist., 5th ser., vol. 11, p. 258, 1883; Galle, 

 Ceylon. 



Pavonia furcata Rehberg, Abhand. Naturwis. Ver. Hamburg, vol. 12, p. 25, plate 4, 

 fig. 3, 1892; Island of Yap. The calices of this coral are bifacial; it is closely 

 related to and is probably a synonym of P. pratorta Dana, although Rehberg 

 says there are some keels. 



Bassett-Smith, in his "Report on the Corals from Tizard and Macclesfield 

 Banks, China Sea," 1 describes and names Pavonia pretiosa and P. ramosa, which 

 seem to me to belong to Leptoseris and to be very close to, if not identical with, 

 Leptoseris papyraca (Dana). The same author refers to another specimen as 

 Pavonia n. sp., which resembles a Hawaiian coral to which I applied the name 

 Leptoseris tubulifera. 



The names of species and variants represented in the U. S. National Museum 

 are preceded by an asterisk in the following synopsis. 



Synopsis of species of Pavona. 



Corrallum frondose or ramose (calices bifacial). 



Fronds flat-sided. 



Ambulacra flat, fronds thick, from 4 mm. to about 1 cm., except on the edge. 

 Columella poorly developed or absent. 

 With carina? transverse to series. 



Distance between series 3 mm *P- decussata Dana. 



Without carina;. 



Calices in short or indistinct series, 2.5 to 4.5 mm. apart, principal septa prominent *P. lata Dana. 



Columella well developed. 

 Carina; not greatly developed. 



Ambulacra wide, 3.5 to 5 mm. between series, series distinct from 15 to 30 mm. or 



more in length *P "ana Dana. 2 



Ambulacra flat, fronds maximum thickness about 7.5 mm. 

 Columella a compressed style. 

 Carina; not greatly developed. 



l*P. danai (M. Edw. and H.) 



Ambulacra 2 to 4 mm. wide, series fairly distinct l*P. complanata Verrill. 



[*P. angularis Klz. 

 Ambulacra convex, septa crowded, fronds usually 3 or 4 mm. thick, near the base 6.5 mm. 

 seems a maximum. 

 Columella a small style, often compressed. 

 Carina; well developed. 



.. j*P. jrondiftra /.am. 



Distance between series 2 to 3 mm.; calices small <^,p f o!ioJ(J Verrill. 



'Am. Mag. Nat. Hist., 6th ser. vol., 6, pp. 444, 445, 1890. 



2 The fronds of P. crassa are decidedly thicker and heavier than in the other species, and the inner ends of 

 the icpta arc compactly joined together. The three varieties of P. crassa are discriminated as follows: 

 Plates wide, not intersecting. 



Edges acute var. ascia. 



Edges obtuse var. obtusa. 



Plates wide, intersecting var. loculata. 



