24 GEAE ZU SOLMS-LATTBACH— MONOGEAPH OF THE ACETABULAEIE^. 



Size : diam. of cap 4 mm. ; breadth of upper corona Oil mm. (Plate I. fig. 11.) 



A. Caly cuius, Zanard., non Quoy et Gaim. 



Bah. In tropical Eastern Asia: first collected in a young unripe state at Sorong, New 

 Guinea, and determined by Zanardini as A. Caly cuius, Quoy et Gaim., afterwards at 

 Macassar in Celebes (no. 927) together Avith A, parvula, also at Maumeri in Elores 

 (no. 1198) by Mrs. Weber van Bosse. Probably the specimens distributed as A. mraihica 

 by Vieillard (no. 2047), from New Caledonia, belong to this species, but the plants 

 are too young for determination. 



The specimens from Maumeri preserved in alcohol permitted closer study of the dense 

 and repeatedly polychotomous hairs, of which one for eacli coronal segment attains 

 development. Ordinarily this is the outermost, sometimes the second of the promi- 

 nences, in which latter case the outermost develops into a somewhat thick-walled knob. 

 The New Caledonian plant shows three, in many cases four hair-scars, w4th the hair- 

 tuft as a rule arising from the innermost. 



A. dentata is easily to be distinguished from tbe two following species by its small 

 size, tbe peculiar dentition of the margin of tbe disc, the inequality of the two coronas, 

 and the hair-scars being in threes. 



6. AcETABULARiA CRENULATA, Lam. Hist. Polyp. corall. flex. 1816, p. 219. 



Plant large. Discs of the younger individuals generally 2-4, above each other, and 

 between them in each case the scars of hair-tufts ; on older plants mostly only the 

 terminal ones persist, and beneath them the nodular thickenings of the stalk denoting 

 the places of attachment of the others. 



Discs basin-shaped, rarely flat, strongly calcified, formed of numerous narrow, united 

 rays (32, 57, 60, 80 counted), with cupola-like arched ends with short apiculum. Corona 

 superior and inferior alike formed of longish crowded segments, externally more or less 

 clearly emarginate and with very much tbickened membranes. Hair-prominences of 

 the corona superior in pairs, one behind the other, on each segment. 



Size: diam. of cap in good specimens 10 -15 mm.; breadth of corona superior 0-22- 

 0-26 mm. ; diam. of spores 0*075 (according to Cramer 06-83 (h). (Plate 1. figs. 1, 2, 3.) 

 Exsicc. Earlow, Anderson & Eaton, Alg. exsicc. Amer. bor. no. 42. 



Rah. At the southern point of Elorida (Key West) ; in multis colls.— Guadeloupe 

 (S. Martin, Lac de Simpson, Conquerant no. 44 lib. Thuret) ; Bahama Islands, 

 Herb. Berol. ; Cobija, Bolivia, coll. Osthaus (Hb. Gottingen), on wood, in company with 

 Neomeris annulata. (" Dans les eaux tranquilles, pen profcmdes, souvent troublees et forte- 

 ment echauffees par le soleil, sur des rochers ensables, des bois immerges, le plus souvent 

 meme dans le sable. Se rencontre assez frequemment en parasite sur Vllalimeda et le 

 Basycladus. N'a pas de saison, persiste toute i'annee, entre en vegetation en Dccembre." 

 — 3£aze et Schramm.) 



I was able to study the disposition of the hairs on a specimen from Key West. The 

 developed hair-tufts form a wreath, while those of the outermost scars are regularly 

 stunted. In addition to this, far fewer tufts thin rays reach full development,'' while 

 every fourth coronal segment bears a fully-developed hair-tuft with three lying between 

 having no such tufts. 



