BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 139 



This species was collected at 11 stations around liie Hawaiian islands, the soiuid- 

 iny sliowini^- a range from li'.i to at least 257 fathoms, hut all tlu^ specimens collected 

 in deep watiM' and at a temperature as low as <«l F.. are smalj, tx'ini;- either young 

 or stunted in their growtli. Tlie most favorable conditions for growth are a depth 

 between 2(5 and 73 fathoms, a temperatui'e of about 70° F., a clear l)ottom of sand, 

 pebbles, or shells. 



Ciitt/jh's. — The characterization of the species is not based upon a single speci- 

 men, but upon a number of specimens that give some idea of its \ ariation. 'i'hey 

 are, with the numbers thev bear in the I'nited States National Museum, as follows: 

 Four specimens, Cat. Nos. 'iO.Srl;?, 20873, from Station 3845; 4 specimens. Cat. Nos. 

 20844, 20876, from Station 3848; 5 specimens, Cat. Nos. 20845, 20875, from Station 

 3849; 2 specimens. Cat. No. 2nS71. from Station 40.")5. 



LEPTOSERIS SCABRA, new species. 



riati- XLI, tigs. 1, 1<(, 2. 



This species liears considerable resemblance to the ])receding, therefore to a 

 certiiin degree the following diagnosis is I'omparative. 



The young corallum is bowl-shaped or somewhat explanate, with the attachment 

 at the center of the base. Later the margins may be reflected and irregularly undu- 

 lated. The diameter may reach 100 mm. ; the corallum is relatively thicker than in 

 L. Itawaiic7isls. 



Calici's unifacial; central calice distinct in young colonies, but may l)e obscured 

 in older ones, the other calices may be irregularly scattered, but usually' concentric 

 arrangement is pronounced. The proximal sides of the calices are almost invariabh- 

 swollen and elevated, producing, when several calices are situated clo.sc together in 

 a row, a more or less continuous ridge below the calicular openings. L. hairallenMs 

 of'en has the proximal sides of the calices somewhat swollen, but a row of calices 

 l)ounded below by a ridge was not observed. The trans\erse outlines of the calices ai'e 

 usually elliptical, the shorter axis parallel to the course of the septo-costa'. Greater 

 diameter, 3 to 5 mm.; lesser, 2 to 4 mm. 



Outer side of the coi'allum striate, the stri;v very line, acute, often blade-like, 

 and distant, their edges micro.scopit'ally serrate. The se})to-cost:v are in comjiarison 

 with f.. hairaiiensis coarse, usually distinctly alternating in size. The edges are 

 very ii'regularly dentate, the d(>ntations having smaller secondary dentations and 

 microscopic' spines. The dentations are not vei'v prominent, are longer than broad, 

 anil lia\e a rough surface. The extreme roughness of the whole calicular surface is 

 the most striking ditference from Z. /laira/'ieiixix. In the vicinity of the calices, and 

 especially on their proximal side, the septo-costte increase in size and prominence. 

 The faces of the septo-costa3 show numerous jjerforatious. The septo-costte in 

 Z. hdii-atii/uxis are imperforate. 



The numl)er of septa to a calice varies from al)out HI to 2*5, excepting the central 

 calice, which may have as many as 36. Usually no delinite cyclical arrangement can be 

 recognized. Inner portion of the margin entire; the s(>ptal faces very minutely and 

 denselv f^ranulated. 



