88 REOKNT MAORKPORARIA (IF THE HAWAIIAN ISLANDS AND LAYSAN. 

 lb. POCILLOPORA CESPITOSA var. TUMIDA, new variety. 

 I'late XII. li^'- 1- 



Corallnni growiii}^- in low chimp.s. The branchlcts iire sliort, ratlier thit'k. .^swollen 

 on the ends. Only the upper 21 mm. of the type of thi.s variety are alive. 

 The measiirenient.s of the three specimens referred to this variety are: 



Specimen . 



Greater distance across 

 Lesser distaiice across .. 

 Height 



No. 1. 



No. 2.n 



No. 3. 



•< Type. 



Calices of the type small, O.-i to 0.5 mm in diameter on the sides of the branches, 

 0.5 to 0.6 on the ends; on specimen No. 3 of the table, some of them measure as 

 much as U.S nun. Distance apart variable, from less than, to several times more than 

 their diameter. 



Coenench3Mnal granulations rather coarse. 



Septa and columella absent, rudimentary or poorly developed. 



Locnlitien. — Prof. W. T. Brio-ham has sent us 1 specimen from Kahana. Oahu, 

 and 2 from Pukoo, Molokai, all obtained in 3 to tS feet of water. 



Type.—^o. 2087(1, U.S.N.M. 



Renmrl's. — The following notes, published by Prof essor Verrill,'* are probably, 

 based on a specimen belonging to this variety: 



"One specimen from tlie United States Exploring Expedition, labeled P. breiicomis by Dana, differs 

 from the ordinary form in having the branches shorter and thicker, with the branchlets shorter and 

 more crowded upon their enlarged ends, thus producing a thicker and lower clump than usual. But 

 in the series there are various intermediate forms between this and those with long branches and 

 slender, spreading branchlets. Like most specimens from the Hawaiian Islands, it has the large, flat, 

 open bulbs made among its branches by Harpalocarcinus mar.wpuilis Stimpson, which renders it prob- 

 able that this specimen wa.s from that locality." 



P. cespitosa \ar. tmidda grades on one side into the typical form of the species, 

 on the other into var. .^tijhqihoruidex. 



ic. POCILLOPORA CESPITOSA var. LAYSANENSIS, new variety. 



Plate XIII, tigs. 1, 2, .3, ia. 



Corallum. growing in low clumps, attached liy a ba.sal expansion, above which 

 rise irregularly shaix'd. s])re;uling branches. The greatest width of one colony is 78 

 mm.; le.s.ser diameter of colony, .57 mm.; height, t!0 mm. 



The branches vary much in size and shape; a few are short, slender, straight, 

 and subterete, but usually they are flattened and crooked. Some are narrow, with 

 irregularly spaced lateral protuberances, that may bear verruca?, incipient branchlets, 



«Proc. Essex Inst., VI, 1869, p. 91. 



